In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger aslab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len =EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order =fls(len) -2=29 ext4_mb_find_good_group_avg_frag_lists frag_list =&sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add anew attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can triggera slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU:0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len= EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order= fls(len)-2= 29 ext4_mb_find_good_group_avg_frag_lists frag_list= &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Adda new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can triggera slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU:0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len= EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order= fls(len)-2= 29 ext4_mb_find_good_group_avg_frag_lists frag_list= &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Adda new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger aslab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len =EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order =fls(len) -2=29 ext4_mb_find_good_group_avg_frag_lists frag_list =&sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add anew attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger aslab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len =EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order =fls(len) -2=29 ext4_mb_find_good_group_avg_frag_lists frag_list =&sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add anew attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can triggera slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU:0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len= EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order= fls(len)-2= 29 ext4_mb_find_good_group_avg_frag_lists frag_list= &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Adda new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.The Linux kernel CVE team has assigned CVE-2024-40955 to this issue.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
| linux | | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | ubuntu |
</details>
二、漏洞分析结构反馈
影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands: mkfs.ext4 -F /dev/$disk 10G mount /dev/$disk /tmp/test echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks ext4_mb_normalize_request ext4_mb_normalize_group_request ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc ext4_mb_regular_allocator ext4_mb_choose_next_group ext4_mb_choose_next_group_best_avail mb_avg_fragment_size_order order = fls(len) - 2 = 29 ext4_mb_find_good_group_avg_frag_lists frag_list = &sbi->s_mb_avg_fragment_size[order] if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
