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[openEuler-1.0-LTS] BUG: KASAN: use-after-free in squashfs_get_id
Done
#ID1V9A
内核缺陷
Long Li
Opened this issue
2025-10-14 17:18
## 错误信息 ``` [ 324.389676] ================================================================== [ 324.391008] BUG: KASAN: use-after-free in squashfs_get_id+0xf5/0x1a0 [ 324.392918] Read of size 8 at addr ffff88800e461858 by task repro/606 [ 324.394418] CPU: 2 PID: 606 Comm: repro Not tainted 4.19.90 #5 [ 324.395460] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 [ 324.397014] Call Trace: [ 324.397541] dump_stack+0x105/0x14f [ 324.398225] print_address_description+0x9e/0x36a [ 324.399130] kasan_report.cold.4+0x22a/0x26a [ 324.399929] ? squashfs_get_id+0xf5/0x1a0 [ 324.400692] __asan_load8+0x115/0x120 [ 324.401392] squashfs_get_id+0xf5/0x1a0 [ 324.402141] ? squashfs_read_fragment_index_table+0xb0/0xb0 [ 324.403164] ? squashfs_read_data.cold.5+0x7f/0x7f [ 324.404059] ? memcpy+0x6a/0x80 [ 324.404689] ? kasan_check_write+0x20/0x30 [ 324.405469] ? _raw_spin_lock+0x2b/0x80 [ 324.406219] ? squashfs_cache_put+0x5a/0x110 [ 324.407019] ? squashfs_read_metadata+0xeb/0x240 [ 324.407884] squashfs_read_inode+0x1f9/0x11d0 [ 324.408692] ? __kasan_slab_free+0x175/0x240 [ 324.409528] ? squashfs_get_id.cold.0+0x3a/0x3a [ 324.410423] ? kasan_check_write+0x20/0x30 [ 324.411192] ? _raw_spin_lock+0x2b/0x80 [ 324.411902] ? squashfs_cache_get+0x426/0x850 [ 324.412720] ? map_id_range_down+0x1a3/0x1d0 [ 324.413506] ? from_kuid+0xb0/0xb0 [ 324.414173] ? kasan_unpoison_shadow+0x38/0x60 [ 324.414996] ? kasan_kmalloc+0x115/0x130 [ 324.415755] ? __list_add_valid+0x3b/0x1c0 [ 324.416538] ? inode_sb_list_add+0xcb/0x120 [ 324.417364] ? squashfs_iget+0xb1/0xf6 [ 324.418060] squashfs_iget+0xb1/0xf6 [ 324.418743] squashfs_lookup+0x6f9/0x8a0 [ 324.419529] ? squashfs_read_inode.cold.0+0x10a/0x10a [ 324.420483] ? __d_lookup_rcu+0x3e0/0x3e0 [ 324.419529] ? squashfs_read_inode.cold.0+0x10a/0x10a [3286/19675] [ 324.420483] ? __d_lookup_rcu+0x3e0/0x3e0 [ 324.421244] ? __save_stack_trace+0xba/0x180 [ 324.422062] ? entry_SYSCALL_64_after_hwframe+0x5c/0xc1 [ 324.423049] ? __d_lookup+0x57/0x330 [ 324.423732] ? kasan_check_write+0x20/0x30 [ 324.424507] ? squashfs_read_inode.cold.0+0x10a/0x10a [ 324.425431] lookup_open+0x33e/0xed0 [ 324.426147] ? deref_stack_reg+0xf0/0xf0 [ 324.426882] ? path_mountpoint+0x6f0/0x6f0 [ 324.427643] ? walk_component+0x92/0x790 [ 324.428378] ? __mnt_want_write+0xf9/0x120 [ 324.429160] do_last+0xe5a/0x1540 [ 324.429808] ? lookup_open+0xed0/0xed0 [ 324.430514] ? generic_permission+0x56/0x410 [ 324.431308] ? security_inode_permission+0x18/0xc0 [ 324.432187] ? inode_permission+0xba/0x390 [ 324.432948] ? link_path_walk+0x2df/0xb10 [ 324.433714] ? __alloc_file+0x2c/0x200 [ 324.434435] ? walk_component+0x790/0x790 [ 324.435203] ? path_init+0x478/0x750 [ 324.435912] path_openat+0x10d/0x550 [ 324.436581] ? _atomic_dec_and_lock+0xc4/0x1cd [ 324.437421] ? do_last+0x1540/0x1540 [ 324.438097] ? kasan_check_read+0x1d/0x30 [ 324.438851] ? mutex_lock+0xa6/0x110 [ 324.439515] ? __mutex_lock_slowpath+0x30/0x30 [ 324.440375] do_filp_open+0x124/0x1f0 [ 324.441081] ? may_open_dev+0x60/0x60 [ 324.441801] ? files_cgroup_unalloc_fd+0x70/0x70 [ 324.442656] ? __check_object_size+0x1f1/0x2dc [ 324.443556] do_sys_open+0x287/0x3a0 [ 324.444250] ? filp_open+0x80/0x80 [ 324.444942] __x64_sys_openat+0x5b/0x70 [ 324.445678] do_syscall_64+0xe3/0x560 [ 324.446388] entry_SYSCALL_64_after_hwframe+0x5c/0xc1 [ 324.447652] Allocated by task 237: [ 324.448304] save_stack+0x4f/0x140 [ 324.448949] kasan_kmalloc+0x115/0x130 [ 324.449670] __kmalloc+0x195/0x370 [ 324.450310] kernfs_fop_write+0x263/0x300 [ 324.451055] __vfs_write+0xce/0x4a0 [ 324.451699] vfs_write+0x105/0x2f0 [ 324.452336] ksys_write+0xb9/0x1f0 [ 324.452975] __x64_sys_write+0x46/0x60 [ 324.453672] do_syscall_64+0xe3/0x560 [ 324.454358] entry_SYSCALL_64_after_hwframe+0x5c/0xc1 [ 324.455552] Freed by task 237: [ 324.456145] save_stack+0x4f/0x140 [ 324.456787] __kasan_slab_free+0x158/0x240 [ 324.457553] kasan_slab_free+0x12/0x20 [ 324.458262] kfree+0xdf/0x3b0 [ 324.458835] kernfs_fop_write+0xef/0x300 [ 324.458262] kfree+0xdf/0x3b0 [3233/19675] [ 324.458835] kernfs_fop_write+0xef/0x300 [ 324.459573] __vfs_write+0xce/0x4a0 [ 324.460221] vfs_write+0x105/0x2f0 [ 324.460861] ksys_write+0xb9/0x1f0 [ 324.461502] __x64_sys_write+0x46/0x60 [ 324.462202] do_syscall_64+0xe3/0x560 [ 324.462871] entry_SYSCALL_64_after_hwframe+0x5c/0xc1 [ 324.464403] The buggy address belongs to the object at ffff88800e461858 which belongs to the cache kmalloc-8 of size 8 [ 324.466522] The buggy address is located 0 bytes inside of 8-byte region [ffff88800e461858, ffff88800e461860) [ 324.468510] The buggy address belongs to the page: [ 324.469387] page:ffffea0000391840 count:1 mapcount:0 mapping:ffff88800b003c00 index:0xffff88800e461f18 [ 324.471057] flags: 0xfffffc0000100(slab) [ 324.471799] raw: 000fffffc0000100 ffffea00003931c0 0000000200000002 ffff88800b003c00 [ 324.473181] raw: ffff88800e461f18 0000000080aa0070 00000001ffffffff 0000000000000000 [ 324.474557] page dumped because: kasan: bad access detected [ 324.475845] Memory state around the buggy address: [ 324.476710] ffff88800e461700: fc 00 fc fc 00 fc fc fb fc fc fb fc fc fb fc fc [ 324.477990] ffff88800e461780: fb fc fc fb fc fc fb fc fc fb fc fc 00 fc fc fb [ 324.479271] >ffff88800e461800: fc fc fb fc fc fb fc fc 00 fc fc fb fc fc fb fc [ 324.480541] ^ [ 324.481635] ffff88800e461880: fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc [ 324.482919] ffff88800e461900: fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb [ 324.484177] ================================================================== ``` ## 复现方法 cc poc.c -static -lpthread -o repro 运行./repro
## 错误信息 ``` [ 324.389676] ================================================================== [ 324.391008] BUG: KASAN: use-after-free in squashfs_get_id+0xf5/0x1a0 [ 324.392918] Read of size 8 at addr ffff88800e461858 by task repro/606 [ 324.394418] CPU: 2 PID: 606 Comm: repro Not tainted 4.19.90 #5 [ 324.395460] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 [ 324.397014] Call Trace: [ 324.397541] dump_stack+0x105/0x14f [ 324.398225] print_address_description+0x9e/0x36a [ 324.399130] kasan_report.cold.4+0x22a/0x26a [ 324.399929] ? squashfs_get_id+0xf5/0x1a0 [ 324.400692] __asan_load8+0x115/0x120 [ 324.401392] squashfs_get_id+0xf5/0x1a0 [ 324.402141] ? squashfs_read_fragment_index_table+0xb0/0xb0 [ 324.403164] ? squashfs_read_data.cold.5+0x7f/0x7f [ 324.404059] ? memcpy+0x6a/0x80 [ 324.404689] ? kasan_check_write+0x20/0x30 [ 324.405469] ? _raw_spin_lock+0x2b/0x80 [ 324.406219] ? squashfs_cache_put+0x5a/0x110 [ 324.407019] ? squashfs_read_metadata+0xeb/0x240 [ 324.407884] squashfs_read_inode+0x1f9/0x11d0 [ 324.408692] ? __kasan_slab_free+0x175/0x240 [ 324.409528] ? squashfs_get_id.cold.0+0x3a/0x3a [ 324.410423] ? kasan_check_write+0x20/0x30 [ 324.411192] ? _raw_spin_lock+0x2b/0x80 [ 324.411902] ? squashfs_cache_get+0x426/0x850 [ 324.412720] ? map_id_range_down+0x1a3/0x1d0 [ 324.413506] ? from_kuid+0xb0/0xb0 [ 324.414173] ? kasan_unpoison_shadow+0x38/0x60 [ 324.414996] ? kasan_kmalloc+0x115/0x130 [ 324.415755] ? __list_add_valid+0x3b/0x1c0 [ 324.416538] ? inode_sb_list_add+0xcb/0x120 [ 324.417364] ? squashfs_iget+0xb1/0xf6 [ 324.418060] squashfs_iget+0xb1/0xf6 [ 324.418743] squashfs_lookup+0x6f9/0x8a0 [ 324.419529] ? squashfs_read_inode.cold.0+0x10a/0x10a [ 324.420483] ? __d_lookup_rcu+0x3e0/0x3e0 [ 324.419529] ? squashfs_read_inode.cold.0+0x10a/0x10a [3286/19675] [ 324.420483] ? __d_lookup_rcu+0x3e0/0x3e0 [ 324.421244] ? __save_stack_trace+0xba/0x180 [ 324.422062] ? entry_SYSCALL_64_after_hwframe+0x5c/0xc1 [ 324.423049] ? __d_lookup+0x57/0x330 [ 324.423732] ? kasan_check_write+0x20/0x30 [ 324.424507] ? squashfs_read_inode.cold.0+0x10a/0x10a [ 324.425431] lookup_open+0x33e/0xed0 [ 324.426147] ? deref_stack_reg+0xf0/0xf0 [ 324.426882] ? path_mountpoint+0x6f0/0x6f0 [ 324.427643] ? walk_component+0x92/0x790 [ 324.428378] ? __mnt_want_write+0xf9/0x120 [ 324.429160] do_last+0xe5a/0x1540 [ 324.429808] ? lookup_open+0xed0/0xed0 [ 324.430514] ? generic_permission+0x56/0x410 [ 324.431308] ? security_inode_permission+0x18/0xc0 [ 324.432187] ? inode_permission+0xba/0x390 [ 324.432948] ? link_path_walk+0x2df/0xb10 [ 324.433714] ? __alloc_file+0x2c/0x200 [ 324.434435] ? walk_component+0x790/0x790 [ 324.435203] ? path_init+0x478/0x750 [ 324.435912] path_openat+0x10d/0x550 [ 324.436581] ? _atomic_dec_and_lock+0xc4/0x1cd [ 324.437421] ? do_last+0x1540/0x1540 [ 324.438097] ? kasan_check_read+0x1d/0x30 [ 324.438851] ? mutex_lock+0xa6/0x110 [ 324.439515] ? __mutex_lock_slowpath+0x30/0x30 [ 324.440375] do_filp_open+0x124/0x1f0 [ 324.441081] ? may_open_dev+0x60/0x60 [ 324.441801] ? files_cgroup_unalloc_fd+0x70/0x70 [ 324.442656] ? __check_object_size+0x1f1/0x2dc [ 324.443556] do_sys_open+0x287/0x3a0 [ 324.444250] ? filp_open+0x80/0x80 [ 324.444942] __x64_sys_openat+0x5b/0x70 [ 324.445678] do_syscall_64+0xe3/0x560 [ 324.446388] entry_SYSCALL_64_after_hwframe+0x5c/0xc1 [ 324.447652] Allocated by task 237: [ 324.448304] save_stack+0x4f/0x140 [ 324.448949] kasan_kmalloc+0x115/0x130 [ 324.449670] __kmalloc+0x195/0x370 [ 324.450310] kernfs_fop_write+0x263/0x300 [ 324.451055] __vfs_write+0xce/0x4a0 [ 324.451699] vfs_write+0x105/0x2f0 [ 324.452336] ksys_write+0xb9/0x1f0 [ 324.452975] __x64_sys_write+0x46/0x60 [ 324.453672] do_syscall_64+0xe3/0x560 [ 324.454358] entry_SYSCALL_64_after_hwframe+0x5c/0xc1 [ 324.455552] Freed by task 237: [ 324.456145] save_stack+0x4f/0x140 [ 324.456787] __kasan_slab_free+0x158/0x240 [ 324.457553] kasan_slab_free+0x12/0x20 [ 324.458262] kfree+0xdf/0x3b0 [ 324.458835] kernfs_fop_write+0xef/0x300 [ 324.458262] kfree+0xdf/0x3b0 [3233/19675] [ 324.458835] kernfs_fop_write+0xef/0x300 [ 324.459573] __vfs_write+0xce/0x4a0 [ 324.460221] vfs_write+0x105/0x2f0 [ 324.460861] ksys_write+0xb9/0x1f0 [ 324.461502] __x64_sys_write+0x46/0x60 [ 324.462202] do_syscall_64+0xe3/0x560 [ 324.462871] entry_SYSCALL_64_after_hwframe+0x5c/0xc1 [ 324.464403] The buggy address belongs to the object at ffff88800e461858 which belongs to the cache kmalloc-8 of size 8 [ 324.466522] The buggy address is located 0 bytes inside of 8-byte region [ffff88800e461858, ffff88800e461860) [ 324.468510] The buggy address belongs to the page: [ 324.469387] page:ffffea0000391840 count:1 mapcount:0 mapping:ffff88800b003c00 index:0xffff88800e461f18 [ 324.471057] flags: 0xfffffc0000100(slab) [ 324.471799] raw: 000fffffc0000100 ffffea00003931c0 0000000200000002 ffff88800b003c00 [ 324.473181] raw: ffff88800e461f18 0000000080aa0070 00000001ffffffff 0000000000000000 [ 324.474557] page dumped because: kasan: bad access detected [ 324.475845] Memory state around the buggy address: [ 324.476710] ffff88800e461700: fc 00 fc fc 00 fc fc fb fc fc fb fc fc fb fc fc [ 324.477990] ffff88800e461780: fb fc fc fb fc fc fb fc fc fb fc fc 00 fc fc fb [ 324.479271] >ffff88800e461800: fc fc fb fc fc fb fc fc 00 fc fc fb fc fc fb fc [ 324.480541] ^ [ 324.481635] ffff88800e461880: fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc [ 324.482919] ffff88800e461900: fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb [ 324.484177] ================================================================== ``` ## 复现方法 cc poc.c -static -lpthread -o repro 运行./repro
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Long Li
2025-10-14 17:19
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