Bug 206073
| Summary: | BUG: KASAN: use-after-free Read in do_update_region | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | donkeysnore |
| Component: | Console/Framebuffers | Assignee: | James Simmons (jsimmons) |
| Status: | NEW --- | ||
| Severity: | normal | ||
| Priority: | P1 | ||
| Hardware: | x86-64 | ||
| OS: | Linux | ||
| Kernel Version: | Linux 5.5.0-rc4+ | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: |
Linux config
C reproduce code |
||
Created attachment 286613 [details]
Linux config
Created attachment 286617 [details]
C reproduce code
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This bug is reproduced by syzkaller ================================================================== BUG: KASAN: use-after-free in do_update_region+0x5ce/0x600 Read of size 2 at addr ffff888000100000 by task syz-executor.0/32237 CPU: 1 PID: 32237 Comm: syz-executor.0 Not tainted 5.5.0-rc4+ #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 Call Trace: dump_stack+0x94/0xce print_address_description.constprop.4+0x16/0x320 __kasan_report+0x177/0x1db kasan_report+0xe/0x20 do_update_region+0x5ce/0x600 csi_J+0x2fa/0xa30 do_con_trol+0x4025/0x58a0 do_con_write.part.25+0x568/0x1c10 con_write+0xa7/0xc0 n_tty_write+0x907/0xdf0 tty_write+0x3f4/0x910 do_iter_write+0x3e7/0x560 vfs_writev+0x164/0x2e0 do_writev+0xff/0x290 do_syscall_64+0x9c/0x390 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45a9e9 Code: bd b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8872609c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000072bf00 RCX: 000000000045a9e9 RDX: 0000000000000001 RSI: 0000000020000740 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f887260a6d4 R13: 00000000004afce8 R14: 00000000006f9dd0 R15: 00000000ffffffff The buggy address belongs to the page: page:ffffea0000004000 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 raw: 0000000000000000 ffff88807ffdc300 ffff88807ffdc300 0000000000000000 raw: 0000000000000000 0000000000000008 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880000fff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880000fff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888000100000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888000100080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888000100100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================