syzbot


WARNING: kmalloc bug in snd_pcm_plugin_alloc (2)

Status: upstream: reported C repro on 2022/03/16 18:51
Reported-by: syzbot+72732c532ac1454eeee9@syzkaller.appspotmail.com
Fix commit: efb6402c3c4a ALSA: oss: Fix PCM OSS buffer allocation overflow
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64]
First crash: 198d, last: 198d

Cause bisection: introduced by (bisect log) :
commit 7661809d493b426e979f39ab512e3adf41fbcc69
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed Jul 14 16:45:49 2021 +0000

  mm: don't allow oversized kvmalloc() calls

Crash: WARNING: kmalloc bug in snd_pcm_plugin_alloc (log)
Repro: C syz .config
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING: kmalloc bug in snd_pcm_plugin_alloc 4 223d 305d 22/24 fixed on 2022/03/08 16:11

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3761 at mm/util.c:591 kvmalloc_node+0x121/0x130 mm/util.c:591
Modules linked in:
CPU: 0 PID: 3761 Comm: syz-executor165 Not tainted 5.17.0-rc7-syzkaller-00227-g68453767131a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kvmalloc_node+0x121/0x130 mm/util.c:591
Code: eb 8e 45 31 e4 e9 49 ff ff ff e8 fa 91 d0 ff 41 81 e5 00 20 00 00 31 ff 44 89 ee e8 69 95 d0 ff 45 85 ed 75 dd e8 df 91 d0 ff <0f> 0b e9 22 ff ff ff 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 e8 c6
RSP: 0018:ffffc9000282fb38 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88801c2d4d00 RCX: 0000000000000000
RDX: ffff88806c235700 RSI: ffffffff81a82e51 RDI: 0000000000000003
RBP: 00000000c0c0c100 R08: 0000000000000000 R09: 00000000ffffffff
R10: ffffffff81a82e47 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000ffffffff R15: ffff88801c2d4d14
FS:  00007f4196580700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffee56e9938 CR3: 000000006d5c7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvmalloc include/linux/slab.h:731 [inline]
 kvzalloc include/linux/slab.h:739 [inline]
 snd_pcm_plugin_alloc+0x570/0x770 sound/core/oss/pcm_plugin.c:71
 snd_pcm_plug_alloc+0x20d/0x310 sound/core/oss/pcm_plugin.c:118
 snd_pcm_oss_change_params_locked+0x19db/0x3bf0 sound/core/oss/pcm_oss.c:1041
 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1104 [inline]
 snd_pcm_oss_get_active_substream+0x164/0x1c0 sound/core/oss/pcm_oss.c:1121
 snd_pcm_oss_get_rate sound/core/oss/pcm_oss.c:1778 [inline]
 snd_pcm_oss_set_rate sound/core/oss/pcm_oss.c:1770 [inline]
 snd_pcm_oss_ioctl+0x144f/0x3430 sound/core/oss/pcm_oss.c:2632
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f41965cf1f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f41965802f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f41966584a8 RCX: 00007f41965cf1f9
RDX: 0000000020000140 RSI: 00000000c0045002 RDI: 0000000000000003
RBP: 00007f41966584a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f41966584ac
R13: 00007f4196625088 R14: 7364612f7665642f R15: 0000000000022000
 </TASK>

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce 2022/03/12 19:11 upstream 68453767131a 9e8eaa75 .config log report syz C WARNING: kmalloc bug in snd_pcm_plugin_alloc
ci-upstream-kasan-gce 2022/03/12 18:48 upstream 68453767131a 9e8eaa75 .config log report info WARNING: kmalloc bug in snd_pcm_plugin_alloc
* Struck through repros no longer work on HEAD.