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【6.6内核】写selinux load文件内核报warning
Done
#ICC1TY
内核缺陷
Cai Xinchen
Opened this issue
2025-06-03 10:30
> _**请尽量提供详细的信息，如缺乏必要的定位信息，则缺陷不会被定位**_ ## 环境信息 【OS版本】（如openEuler-22.03-LTS，参考命令"cat /etc/os-release"结果） 【内核版本】（如kernel-5.10.0-60.138.0.165，参考命令"uname -r"结果） Linux localhost.localdomain 6.6.0 【硬件平台】（缺陷相关的硬件信息，如：处理器型号、内存、磁盘、网卡、BIOS 等信息） 【组网信息】（和网络、性能相关的问题，应该说明详细的组网和场景信息） ## 缺陷信息 【问题复现步骤】 ``` #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <string.h> int main() { int fd; const char policy_data[] = "\x8c\xff\x7c\xf9\x08\x00\x00\x00\x53\x45\x20\x4c\x69\x6e\x75\x78\x15\x00\x00\x00\xe0\xff\x96\x2a\x08\x00\x00\x00\x07\x00\x00\x00\x4c\xf5\x23\xcd\x7e\xec\x26\x88\x6d\x70\xa6\xb7\xc7\x8b\x49\x6f\x1a\x0a\x19\x2c\xea\x34\xff\x41\x70\x58\x1a\x74\x3f\xf0\xcf\xb9\x7e\xa0\xf0\xd1\x70\xd1\xfe\x14\x41\xc2\xf7\xc8\xea\x1c\x78\xdd\x17\xa1\x92\x49\x35\x21\x00\x81\xa8\x3c\x30\xec\x41\x71\x45\x0b\xfc\x1d\xe1\x2c\xfe\x1f\xf3\x42\xa8\x87"; size_t policy_length = sizeof(policy_data); // 减去字符串的空字符 // 打开 /sys/fs/selinux/load 文件 fd = open("/sys/fs/selinux/load", O_WRONLY); if (fd < 0) { perror("open"); return 1; } printf("policy_length(%lu)\n", policy_length); // 写入策略数据 if (write(fd, policy_data, policy_length) < 0) { perror("write"); } // 关闭文件 close(fd); return 0; } ``` 编译，执行 【实际结果】请描述出问题的结果和影响 往/sys/fs/selinux/load里面写策略，数值超出calloc中order大小，导致报warning 【期望结果】请描述出期望的结果和影响 不报warning 【其他相关附件信息】比如 syslog、dmesg、panic、lockup、kdump 信息、图片等 [ 701.622578] ------------[ cut here ]------------ [ 701.623254] WARNING: CPU: 5 PID: 502 at mm/page_alloc.c:4864 __alloc_pages+0x27f/0x2f0 [ 701.624294] Modules linked in: [ 701.624843] CPU: 5 PID: 502 Comm: selinux_policy Tainted: G I 6.6.0-g955075300290 #8 [ 701.625660] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 [ 701.626644] RIP: 0010:__alloc_pages+0x27f/0x2f0 [ 701.626996] Code: e8 96 57 fb ff e9 c3 fe ff ff 83 fe 0a 0f 86 01 fe ff ff 45 31 f6 80 3d 3c 21 a3 01 00 0f 85 04 ff ff ff c6 05 2f 21 a3 01 01 <0f> 0b e9 f6 fe ff ff f7 c2 00 00 08 00 75 52 89 d9 80 e12 [ 701.628636] RSP: 0018:ffff9e65808dbac8 EFLAGS: 00000246 [ 701.629151] RAX: 0000000000000000 RBX: 0000000000040dc0 RCX: 0000000000000000 [ 701.629664] RDX: 0000000000000000 RSI: 0000000000000016 RDI: 0000000000040dc0 [ 701.630272] RBP: 0000000000000000 R08: 0000000000000020 R09: 0000000000000000 [ 701.630891] R10: ffff98f3412dcd20 R11: ffff98f3412e3158 R12: 0000000000000016 [ 701.631582] R13: 0000000000000016 R14: 0000000000000000 R15: ffff9e65808dbd50 [ 701.632025] FS: 00007f0a0c05f600(0000) GS:ffff98f477d40000(0000) knlGS:0000000000000000 [ 701.632894] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 701.633416] CR2: 00007f0a0c017d27 CR3: 00000001050dc000 CR4: 00000000000006e0 [ 701.634063] Call Trace: [ 701.635159] <TASK> [ 701.636603] ? hashtab_init+0x4a/0x80 [ 701.637068] __kmalloc_large_node+0x79/0x150 [ 701.637485] __kmalloc+0xbe/0x130 [ 701.637765] hashtab_init+0x4a/0x80 [ 701.638094] common_read+0xb3/0x1c0 [ 701.638404] ? __pfx_common_read+0x10/0x10 [ 701.638762] policydb_read+0x44b/0x1f10 [ 701.639150] ? security_load_policy+0x71/0x5c0 [ 701.639581] security_load_policy+0x8e/0x5c0 [ 701.639932] sel_write_load+0x129/0xae0 [ 701.640347] ? __wake_up+0x3f/0x60 [ 701.640636] ? inode_security+0x1d/0x60 [ 701.640962] ? selinux_file_permission+0x109/0x150 [ 701.641377] vfs_write+0xf6/0x3f0 [ 701.641666] ksys_write+0x5e/0xe0 [ 701.641950] do_syscall_64+0x44/0xb0 [ 701.642355] entry_SYSCALL_64_after_hwframe+0x78/0xe2 [ 701.642952] RIP: 0033:0x7f0a0bf599a7 [ 701.643593] Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 484 [ 701.645178] RSP: 002b:00007ffe5b638c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 701.645771] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0a0bf599a7 [ 701.646350] RDX: 000000000000006b RSI: 00007ffe5b638c10 RDI: 0000000000000003 [ 701.646992] RBP: 00007ffe5b638c90 R08: 0000000000000000 R09: 00007ffe5b638ae5 [ 701.647654] R10: 00000000004004d1 R11: 0000000000000246 R12: 00007ffe5b638dc8 [ 701.648428] R13: 0000000000401162 R14: 00007f0a0c097a80 R15: 0000000000403e08 [ 701.649170] </TASK> [ 701.649578] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 701.650079] CPU: 5 PID: 502 Comm: selinux_policy Tainted: G I 6.6.0-g955075300290 #8 [ 701.650079] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 [ 701.650079] Call Trace: [ 701.650079] <TASK> [ 701.650079] dump_stack_lvl+0x37/0x50 [ 701.650079] panic+0x22c/0x320 [ 701.650079] ? __alloc_pages+0x27f/0x2f0 [ 701.650079] check_panic_on_warn+0x3f/0x50 [ 701.650079] __warn+0x8b/0x130 [ 701.650079] ? __alloc_pages+0x27f/0x2f0 [ 701.650079] report_bug+0x199/0x1b0 [ 701.650079] handle_bug+0x53/0x90 [ 701.650079] exc_invalid_op+0x18/0x70 [ 701.650079] asm_exc_invalid_op+0x1a/0x20 [ 701.650079] RIP: 0010:__alloc_pages+0x27f/0x2f0 [ 701.650079] Code: e8 96 57 fb ff e9 c3 fe ff ff 83 fe 0a 0f 86 01 fe ff ff 45 31 f6 80 3d 3c 21 a3 01 00 0f 85 04 ff ff ff c6 05 2f 21 a3 01 01 <0f> 0b e9 f6 fe ff ff f7 c2 00 00 08 00 75 52 89 d9 80 e12 [ 701.650079] RSP: 0018:ffff9e65808dbac8 EFLAGS: 00000246 [ 701.650079] RAX: 0000000000000000 RBX: 0000000000040dc0 RCX: 0000000000000000 [ 701.650079] RDX: 0000000000000000 RSI: 0000000000000016 RDI: 0000000000040dc0 [ 701.650079] RBP: 0000000000000000 R08: 0000000000000020 R09: 0000000000000000 [ 701.650079] R10: ffff98f3412dcd20 R11: ffff98f3412e3158 R12: 0000000000000016 [ 701.650079] R13: 0000000000000016 R14: 0000000000000000 R15: ffff9e65808dbd50 [ 701.650079] ? hashtab_init+0x4a/0x80 [ 701.650079] __kmalloc_large_node+0x79/0x150 [ 701.650079] __kmalloc+0xbe/0x130 [ 701.650079] hashtab_init+0x4a/0x80 [ 701.650079] common_read+0xb3/0x1c0 [ 701.650079] ? __pfx_common_read+0x10/0x10 [ 701.650079] policydb_read+0x44b/0x1f10 [ 701.650079] ? security_load_policy+0x71/0x5c0 [ 701.650079] security_load_policy+0x8e/0x5c0 [ 701.650079] sel_write_load+0x129/0xae0 [ 701.650079] ? __wake_up+0x3f/0x60 [ 701.650079] ? inode_security+0x1d/0x60 [ 701.650079] ? selinux_file_permission+0x109/0x150 [ 701.650079] vfs_write+0xf6/0x3f0 [ 701.650079] ksys_write+0x5e/0xe0 [ 701.650079] do_syscall_64+0x44/0xb0 [ 701.650079] entry_SYSCALL_64_after_hwframe+0x78/0xe2 [ 701.650079] RIP: 0033:0x7f0a0bf599a7 [ 701.650079] Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 484 [ 701.650079] RSP: 002b:00007ffe5b638c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 701.650079] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0a0bf599a7 [ 701.650079] RDX: 000000000000006b RSI: 00007ffe5b638c10 RDI: 0000000000000003 [ 701.650079] RBP: 00007ffe5b638c90 R08: 0000000000000000 R09: 00007ffe5b638ae5 [ 701.650079] R10: 00000000004004d1 R11: 0000000000000246 R12: 00007ffe5b638dc8 [ 701.650079] R13: 0000000000401162 R14: 00007f0a0c097a80 R15: 0000000000403e08 [ 701.650079] </TASK> [ 701.650079] Kernel Offset: 0x39000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 701.650079] ---[ end Kernel panic - not syncing: kernel: panic_on_warn set ... ]- ``` # 这里可以附上相关文本信息 ``` 【已分析信息】如已经做过分析和定位，请尽量附上详细的分析结果 **二、缺陷分析结构反馈** 影响性分析说明： 缺陷严重等级:(Critical/High/Moderate/Low) 缺陷根因说明: 受影响版本排查(受影响/不受影响): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1 修复是否涉及abi变化(是/否): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1
> _**请尽量提供详细的信息，如缺乏必要的定位信息，则缺陷不会被定位**_ ## 环境信息 【OS版本】（如openEuler-22.03-LTS，参考命令"cat /etc/os-release"结果） 【内核版本】（如kernel-5.10.0-60.138.0.165，参考命令"uname -r"结果） Linux localhost.localdomain 6.6.0 【硬件平台】（缺陷相关的硬件信息，如：处理器型号、内存、磁盘、网卡、BIOS 等信息） 【组网信息】（和网络、性能相关的问题，应该说明详细的组网和场景信息） ## 缺陷信息 【问题复现步骤】 ``` #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <string.h> int main() { int fd; const char policy_data[] = "\x8c\xff\x7c\xf9\x08\x00\x00\x00\x53\x45\x20\x4c\x69\x6e\x75\x78\x15\x00\x00\x00\xe0\xff\x96\x2a\x08\x00\x00\x00\x07\x00\x00\x00\x4c\xf5\x23\xcd\x7e\xec\x26\x88\x6d\x70\xa6\xb7\xc7\x8b\x49\x6f\x1a\x0a\x19\x2c\xea\x34\xff\x41\x70\x58\x1a\x74\x3f\xf0\xcf\xb9\x7e\xa0\xf0\xd1\x70\xd1\xfe\x14\x41\xc2\xf7\xc8\xea\x1c\x78\xdd\x17\xa1\x92\x49\x35\x21\x00\x81\xa8\x3c\x30\xec\x41\x71\x45\x0b\xfc\x1d\xe1\x2c\xfe\x1f\xf3\x42\xa8\x87"; size_t policy_length = sizeof(policy_data); // 减去字符串的空字符 // 打开 /sys/fs/selinux/load 文件 fd = open("/sys/fs/selinux/load", O_WRONLY); if (fd < 0) { perror("open"); return 1; } printf("policy_length(%lu)\n", policy_length); // 写入策略数据 if (write(fd, policy_data, policy_length) < 0) { perror("write"); } // 关闭文件 close(fd); return 0; } ``` 编译，执行 【实际结果】请描述出问题的结果和影响 往/sys/fs/selinux/load里面写策略，数值超出calloc中order大小，导致报warning 【期望结果】请描述出期望的结果和影响 不报warning 【其他相关附件信息】比如 syslog、dmesg、panic、lockup、kdump 信息、图片等 [ 701.622578] ------------[ cut here ]------------ [ 701.623254] WARNING: CPU: 5 PID: 502 at mm/page_alloc.c:4864 __alloc_pages+0x27f/0x2f0 [ 701.624294] Modules linked in: [ 701.624843] CPU: 5 PID: 502 Comm: selinux_policy Tainted: G I 6.6.0-g955075300290 #8 [ 701.625660] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 [ 701.626644] RIP: 0010:__alloc_pages+0x27f/0x2f0 [ 701.626996] Code: e8 96 57 fb ff e9 c3 fe ff ff 83 fe 0a 0f 86 01 fe ff ff 45 31 f6 80 3d 3c 21 a3 01 00 0f 85 04 ff ff ff c6 05 2f 21 a3 01 01 <0f> 0b e9 f6 fe ff ff f7 c2 00 00 08 00 75 52 89 d9 80 e12 [ 701.628636] RSP: 0018:ffff9e65808dbac8 EFLAGS: 00000246 [ 701.629151] RAX: 0000000000000000 RBX: 0000000000040dc0 RCX: 0000000000000000 [ 701.629664] RDX: 0000000000000000 RSI: 0000000000000016 RDI: 0000000000040dc0 [ 701.630272] RBP: 0000000000000000 R08: 0000000000000020 R09: 0000000000000000 [ 701.630891] R10: ffff98f3412dcd20 R11: ffff98f3412e3158 R12: 0000000000000016 [ 701.631582] R13: 0000000000000016 R14: 0000000000000000 R15: ffff9e65808dbd50 [ 701.632025] FS: 00007f0a0c05f600(0000) GS:ffff98f477d40000(0000) knlGS:0000000000000000 [ 701.632894] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 701.633416] CR2: 00007f0a0c017d27 CR3: 00000001050dc000 CR4: 00000000000006e0 [ 701.634063] Call Trace: [ 701.635159] <TASK> [ 701.636603] ? hashtab_init+0x4a/0x80 [ 701.637068] __kmalloc_large_node+0x79/0x150 [ 701.637485] __kmalloc+0xbe/0x130 [ 701.637765] hashtab_init+0x4a/0x80 [ 701.638094] common_read+0xb3/0x1c0 [ 701.638404] ? __pfx_common_read+0x10/0x10 [ 701.638762] policydb_read+0x44b/0x1f10 [ 701.639150] ? security_load_policy+0x71/0x5c0 [ 701.639581] security_load_policy+0x8e/0x5c0 [ 701.639932] sel_write_load+0x129/0xae0 [ 701.640347] ? __wake_up+0x3f/0x60 [ 701.640636] ? inode_security+0x1d/0x60 [ 701.640962] ? selinux_file_permission+0x109/0x150 [ 701.641377] vfs_write+0xf6/0x3f0 [ 701.641666] ksys_write+0x5e/0xe0 [ 701.641950] do_syscall_64+0x44/0xb0 [ 701.642355] entry_SYSCALL_64_after_hwframe+0x78/0xe2 [ 701.642952] RIP: 0033:0x7f0a0bf599a7 [ 701.643593] Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 484 [ 701.645178] RSP: 002b:00007ffe5b638c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 701.645771] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0a0bf599a7 [ 701.646350] RDX: 000000000000006b RSI: 00007ffe5b638c10 RDI: 0000000000000003 [ 701.646992] RBP: 00007ffe5b638c90 R08: 0000000000000000 R09: 00007ffe5b638ae5 [ 701.647654] R10: 00000000004004d1 R11: 0000000000000246 R12: 00007ffe5b638dc8 [ 701.648428] R13: 0000000000401162 R14: 00007f0a0c097a80 R15: 0000000000403e08 [ 701.649170] </TASK> [ 701.649578] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 701.650079] CPU: 5 PID: 502 Comm: selinux_policy Tainted: G I 6.6.0-g955075300290 #8 [ 701.650079] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 [ 701.650079] Call Trace: [ 701.650079] <TASK> [ 701.650079] dump_stack_lvl+0x37/0x50 [ 701.650079] panic+0x22c/0x320 [ 701.650079] ? __alloc_pages+0x27f/0x2f0 [ 701.650079] check_panic_on_warn+0x3f/0x50 [ 701.650079] __warn+0x8b/0x130 [ 701.650079] ? __alloc_pages+0x27f/0x2f0 [ 701.650079] report_bug+0x199/0x1b0 [ 701.650079] handle_bug+0x53/0x90 [ 701.650079] exc_invalid_op+0x18/0x70 [ 701.650079] asm_exc_invalid_op+0x1a/0x20 [ 701.650079] RIP: 0010:__alloc_pages+0x27f/0x2f0 [ 701.650079] Code: e8 96 57 fb ff e9 c3 fe ff ff 83 fe 0a 0f 86 01 fe ff ff 45 31 f6 80 3d 3c 21 a3 01 00 0f 85 04 ff ff ff c6 05 2f 21 a3 01 01 <0f> 0b e9 f6 fe ff ff f7 c2 00 00 08 00 75 52 89 d9 80 e12 [ 701.650079] RSP: 0018:ffff9e65808dbac8 EFLAGS: 00000246 [ 701.650079] RAX: 0000000000000000 RBX: 0000000000040dc0 RCX: 0000000000000000 [ 701.650079] RDX: 0000000000000000 RSI: 0000000000000016 RDI: 0000000000040dc0 [ 701.650079] RBP: 0000000000000000 R08: 0000000000000020 R09: 0000000000000000 [ 701.650079] R10: ffff98f3412dcd20 R11: ffff98f3412e3158 R12: 0000000000000016 [ 701.650079] R13: 0000000000000016 R14: 0000000000000000 R15: ffff9e65808dbd50 [ 701.650079] ? hashtab_init+0x4a/0x80 [ 701.650079] __kmalloc_large_node+0x79/0x150 [ 701.650079] __kmalloc+0xbe/0x130 [ 701.650079] hashtab_init+0x4a/0x80 [ 701.650079] common_read+0xb3/0x1c0 [ 701.650079] ? __pfx_common_read+0x10/0x10 [ 701.650079] policydb_read+0x44b/0x1f10 [ 701.650079] ? security_load_policy+0x71/0x5c0 [ 701.650079] security_load_policy+0x8e/0x5c0 [ 701.650079] sel_write_load+0x129/0xae0 [ 701.650079] ? __wake_up+0x3f/0x60 [ 701.650079] ? inode_security+0x1d/0x60 [ 701.650079] ? selinux_file_permission+0x109/0x150 [ 701.650079] vfs_write+0xf6/0x3f0 [ 701.650079] ksys_write+0x5e/0xe0 [ 701.650079] do_syscall_64+0x44/0xb0 [ 701.650079] entry_SYSCALL_64_after_hwframe+0x78/0xe2 [ 701.650079] RIP: 0033:0x7f0a0bf599a7 [ 701.650079] Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 484 [ 701.650079] RSP: 002b:00007ffe5b638c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 701.650079] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0a0bf599a7 [ 701.650079] RDX: 000000000000006b RSI: 00007ffe5b638c10 RDI: 0000000000000003 [ 701.650079] RBP: 00007ffe5b638c90 R08: 0000000000000000 R09: 00007ffe5b638ae5 [ 701.650079] R10: 00000000004004d1 R11: 0000000000000246 R12: 00007ffe5b638dc8 [ 701.650079] R13: 0000000000401162 R14: 00007f0a0c097a80 R15: 0000000000403e08 [ 701.650079] </TASK> [ 701.650079] Kernel Offset: 0x39000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 701.650079] ---[ end Kernel panic - not syncing: kernel: panic_on_warn set ... ]- ``` # 这里可以附上相关文本信息 ``` 【已分析信息】如已经做过分析和定位，请尽量附上详细的分析结果 **二、缺陷分析结构反馈** 影响性分析说明： 缺陷严重等级:(Critical/High/Moderate/Low) 缺陷根因说明: 受影响版本排查(受影响/不受影响): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1 修复是否涉及abi变化(是/否): openEuler-20.03-LTS-SP4 openEuler-22.03-LTS-SP3 openEuler-22.03-LTS-SP4 openEuler-24.03-LTS openEuler-24.03-LTS-SP1
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