Bug 206071
| Summary: | BUG: KASAN: slab-out-of-bounds Write in vgacon_scroll | ||
|---|---|---|---|
| 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: |
C reproduce syzkaller
Linux config |
||
Created attachment 286609 [details]
C reproduce syzkaller
Created attachment 286611 [details]
Linux config
|
================================================================== BUG: KASAN: slab-out-of-bounds in vgacon_scroll+0x6a5/0x890 Write of size 42728 at addr ffff88806c8ba6e8 by task syz-executor.0/13463 CPU: 0 PID: 13463 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 check_memory_region+0x161/0x1c0 memcpy+0x34/0x50 vgacon_scroll+0x6a5/0x890 con_scroll+0x519/0x5f0 lf+0x248/0x290 do_con_trol+0x231/0x58a0 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:00007f4520ee3c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000072bf00 RCX: 000000000045a9e9 RDX: 0000000000000001 RSI: 0000000020000440 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4520ee46d4 R13: 00000000004afce8 R14: 00000000006f9dd0 R15: 00000000ffffffff The buggy address belongs to the page: page:ffffea0001b22c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0 raw: 0100000000010000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806c8bff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806c8bff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88806c8c0000: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ^ ffff88806c8c0080: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff88806c8c0100: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ==================================================================