syzbot


WARNING in emulate_vsyscall (2)

Status: upstream: reported C repro on 2024/04/03 18:24
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+1a55be5c9d955093937c@syzkaller.appspotmail.com
First crash: 46d, last: 15d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [kernel?] WARNING in emulate_vsyscall (2) 0 (1) 2024/04/03 18:24
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in emulate_vsyscall kernel C done done 3890 965d 1146d 20/26 fixed on 2022/03/08 16:11
linux-6.1 WARNING in emulate_vsyscall origin:upstream C 3 35d 42d 0/3 upstream: reported C repro on 2024/04/06 00:40
Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/05/17 08:07 27m retest repro upstream OK log
2024/04/02 18:04 5h12m zokeefe@google.com https://prodkernel.git.corp.google.com/kernel/release/11xx next error OK

Sample crash report:
syz-executor110[5075] vsyscall fault (exploit attempt?) ip:ffffffffff600000 cs:33 sp:7f991ee20c78 ax:ffffffffffffffda si:7f991ee20db0 di:19
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5075 at arch/x86/entry/vsyscall/vsyscall_64.c:278 emulate_vsyscall+0xf5a/0x1270 arch/x86/entry/vsyscall/vsyscall_64.c:277
Modules linked in:
CPU: 0 PID: 5075 Comm: syz-executor110 Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:emulate_vsyscall+0xf5a/0x1270 arch/x86/entry/vsyscall/vsyscall_64.c:277
Code: 0f 0b 90 e9 f6 f1 ff ff e8 23 74 94 00 90 0f 0b 90 e9 e8 f2 ff ff e8 15 74 94 00 90 0f 0b 90 e9 58 f3 ff ff e8 07 74 94 00 90 <0f> 0b 90 e9 58 fe ff ff 48 c7 c1 00 31 fa 8d 80 e1 07 80 c1 03 38
RSP: 0000:ffffc90004447e60 EFLAGS: 00010293
RAX: ffffffff81008149 RBX: 0000000000000100 RCX: ffff8880228d1e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff810080a1 R09: 1ffff92000888f5c
R10: dffffc0000000000 R11: fffff52000888f5d R12: 1ffff92000888ffe
R13: ffff8880228d3710 R14: ffffc90004447ff0 R15: 1ffff1100451a6e2
FS:  00007f991ee216c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000019 CR3: 000000007906a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_user_addr_fault arch/x86/mm/fault.c:1346 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x160/0x890 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:_end+0x6abda000/0x0
Code: Unable to access opcode bytes at 0xffffffffff5fffd6.
RSP: 002b:00007f991ee20c78 EFLAGS: 00010246
RAX: ffffffffffffffda RBX: 00007f991eef0308 RCX: 00007f991ee66739
RDX: 00007f991ee20c80 RSI: 00007f991ee20db0 RDI: 0000000000000019
RBP: 00007f991eef0300 R08: 00007f991ee216c0 R09: 00007f991ee216c0
R10: 0000800000000007 R11: 0000000000000246 R12: 00007f991eef030c
R13: 0400000000000000 R14: 66aa589070d556b8 R15: 00007ffedb75c428
 </TASK>

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/02 03:46 upstream 480e035fc4c7 6baf5069 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in emulate_vsyscall
2024/05/03 08:03 upstream 49a73b1652c5 ddfc15a1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in emulate_vsyscall
2024/04/23 16:49 upstream 71b1543c83d6 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in emulate_vsyscall
2024/04/08 06:15 upstream 480e035fc4c7 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in emulate_vsyscall
2024/04/07 23:51 upstream 480e035fc4c7 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in emulate_vsyscall
2024/04/06 15:23 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in emulate_vsyscall
* Struck through repros no longer work on HEAD.