Title | Replies (including bot) | Last reply |
---|---|---|
[PATCH] Revert "vc_screen: extract vcs_read_buf_header" | 1 (1) | 2020/08/24 09:54 |
KASAN: use-after-free Write in vcs_read | 3 (6) | 2020/08/24 08:22 |
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Title | Replies (including bot) | Last reply |
---|---|---|
[PATCH] Revert "vc_screen: extract vcs_read_buf_header" | 1 (1) | 2020/08/24 09:54 |
KASAN: use-after-free Write in vcs_read | 3 (6) | 2020/08/24 08:22 |
================================================================== BUG: KASAN: use-after-free in vcs_read_buf drivers/tty/vt/vc_screen.c:357 [inline] BUG: KASAN: use-after-free in vcs_read+0xaa7/0xb40 drivers/tty/vt/vc_screen.c:449 Write of size 2 at addr ffff8880983c6000 by task syz-executor929/6850 CPU: 1 PID: 6850 Comm: syz-executor929 Not tainted 5.9.0-rc2-next-20200824-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 vcs_read_buf drivers/tty/vt/vc_screen.c:357 [inline] vcs_read+0xaa7/0xb40 drivers/tty/vt/vc_screen.c:449 do_loop_readv_writev fs/read_write.c:734 [inline] do_loop_readv_writev fs/read_write.c:721 [inline] do_iter_read+0x48e/0x6e0 fs/read_write.c:955 vfs_readv+0xe5/0x150 fs/read_write.c:1073 do_preadv fs/read_write.c:1165 [inline] __do_sys_preadv fs/read_write.c:1215 [inline] __se_sys_preadv fs/read_write.c:1210 [inline] __x64_sys_preadv+0x231/0x310 fs/read_write.c:1210 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x440339 Code: 23 02 00 85 c0 b8 00 00 00 00 48 0f 44 c3 5b c3 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 1b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc1f157e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007ffc1f157e60 RCX: 0000000000440339 RDX: 0000000000000006 RSI: 0000000020001b00 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 0000000000000000 R09: 6c616b7a79732f2e R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000401ae0 R13: 0000000000401b70 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 6850: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 __do_kmalloc mm/slab.c:3655 [inline] __kmalloc+0x1a8/0x320 mm/slab.c:3664 kmalloc include/linux/slab.h:559 [inline] tomoyo_realpath_from_path+0xc3/0x620 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x212/0x3f0 security/tomoyo/file.c:822 security_inode_getattr+0xcf/0x140 security/security.c:1278 vfs_getattr fs/stat.c:121 [inline] vfs_statx_fd+0x70/0xf0 fs/stat.c:151 vfs_fstat include/linux/fs.h:3186 [inline] __do_sys_newfstat+0x88/0x100 fs/stat.c:398 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 6850: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3418 [inline] kfree+0x103/0x2c0 mm/slab.c:3756 tomoyo_realpath_from_path+0x191/0x620 security/tomoyo/realpath.c:291 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x212/0x3f0 security/tomoyo/file.c:822 security_inode_getattr+0xcf/0x140 security/security.c:1278 vfs_getattr fs/stat.c:121 [inline] vfs_statx_fd+0x70/0xf0 fs/stat.c:151 vfs_fstat include/linux/fs.h:3186 [inline] __do_sys_newfstat+0x88/0x100 fs/stat.c:398 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8880983c6000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 0 bytes inside of 4096-byte region [ffff8880983c6000, ffff8880983c7000) The buggy address belongs to the page: page:00000000b618e75c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x983c6 head:00000000b618e75c order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea000251f308 ffffea0002381808 ffff8880aa040900 raw: 0000000000000000 ffff8880983c6000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880983c5f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880983c5f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880983c6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880983c6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880983c6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2020/08/24 13:59 | linux-next | d8be0e12a522 | 67b599d1 | .config | console log | report | syz | C | ci-upstream-linux-next-kasan-gce-root | |||
2020/08/23 17:06 | linux-next | 494d311a82bb | cef5ae68 | .config | console log | report | syz | C | ci-upstream-linux-next-kasan-gce-root | |||
2020/08/23 01:19 | linux-next | 494d311a82bb | 1da71ab0 | .config | console log | report | syz | C | ci-upstream-linux-next-kasan-gce-root | |||
2020/08/22 04:16 | linux-next | 494d311a82bb | 6436ce4b | .config | console log | report | syz | C | ci-upstream-linux-next-kasan-gce-root | |||
2020/08/26 07:31 | linux-next | 3a00d3dfd4b6 | 344da168 | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | |||||
2020/08/25 19:55 | linux-next | 3a00d3dfd4b6 | 344da168 | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | |||||
2020/08/24 01:46 | linux-next | 494d311a82bb | cef5ae68 | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | |||||
2020/08/22 15:34 | linux-next | 494d311a82bb | 6436ce4b | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | |||||
2020/08/22 15:12 | linux-next | 494d311a82bb | 6436ce4b | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | |||||
2020/08/22 14:29 | linux-next | 494d311a82bb | 6436ce4b | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | |||||
2020/08/20 06:55 | linux-next | 605cbf3d5f20 | ed282a3a | .config | console log | report | ci-upstream-linux-next-kasan-gce-root |