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From: syzbot <>
Subject: [syzbot] KMSAN: uninit-value in pagecache_write
Date: Mon, 07 Nov 2022 01:10:43 -0800	[thread overview]
Message-ID: <> (raw)


syzbot found the following issue on:

HEAD commit:    968c2729e576 x86: kmsan: fix comment in kmsan_shadow.c
git tree: master
console output:
kernel config:
dashboard link:
compiler:       clang version 15.0.0 ( 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

BUG: KMSAN: uninit-value in pagecache_write+0x655/0x720 fs/ext4/verity.c:91
 pagecache_write+0x655/0x720 fs/ext4/verity.c:91
 ext4_write_merkle_tree_block+0x84/0xa0 fs/ext4/verity.c:389
 build_merkle_tree_level+0x972/0x1250 fs/verity/enable.c:121
 build_merkle_tree fs/verity/enable.c:182 [inline]
 enable_verity+0xede/0x1920 fs/verity/enable.c:268
 fsverity_ioctl_enable+0x895/0xab0 fs/verity/enable.c:392
 __ext4_ioctl fs/ext4/ioctl.c:1572 [inline]
 ext4_ioctl+0x26dd/0x8c50 fs/ext4/ioctl.c:1606
 ext4_compat_ioctl+0x702/0x800 fs/ext4/ioctl.c:1682
 __do_compat_sys_ioctl fs/ioctl.c:968 [inline]
 __se_compat_sys_ioctl+0x781/0xfa0 fs/ioctl.c:910
 __ia32_compat_sys_ioctl+0x8f/0xd0 fs/ioctl.c:910
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246

Local variable fsdata created at:
 pagecache_write+0x21c/0x720 fs/ext4/verity.c:85
 ext4_write_merkle_tree_block+0x84/0xa0 fs/ext4/verity.c:389

CPU: 1 PID: 15121 Comm: syz-executor.3 Not tainted 6.0.0-rc5-syzkaller-48543-g968c2729e576 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022

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             reply	other threads:[~2022-11-07  9:10 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-07  9:10 syzbot [this message]
2022-11-07  9:46 ` [syzbot] KMSAN: uninit-value in pagecache_write Alexander Potapenko
2022-11-07 17:56   ` Eric Biggers
2022-11-07 18:14     ` Alexander Potapenko
2022-11-08  9:08       ` Alexander Potapenko
2022-11-08 17:41         ` Eric Biggers
2022-11-10 11:01           ` Alexander Potapenko

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