linux-kernel - [syzbot] KMSAN: uninit-value in do_user_addr

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Date:   Thu, 24 Mar 2022 06:48:21 -0700
From:   syzbot <syzbot+6684a9d1b4d61d0b8f3e@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, dvyukov@...gle.com, elver@...gle.com,
        glider@...gle.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] KMSAN: uninit-value in do_user_addr_fault (3)

Hello,

syzbot found the following issue on:

HEAD commit:    724946410067 x86: kmsan: enable KMSAN builds for x86
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1734f916700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=76f99026248b24e4
dashboard link: https://syzkaller.appspot.com/bug?extid=6684a9d1b4d61d0b8f3e
compiler:       clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14b1cbf2700000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=131d38a6700000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6684a9d1b4d61d0b8f3e@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in arch_stack_walk+0x1ad/0x3c0 arch/x86/kernel/stacktrace.c:21
 arch_stack_walk+0x1ad/0x3c0 arch/x86/kernel/stacktrace.c:21
 stack_trace_save+0x43/0x60 kernel/stacktrace.c:122
 kmsan_save_stack_with_flags mm/kmsan/core.c:80 [inline]
 kmsan_internal_chain_origin+0xa9/0x110 mm/kmsan/core.c:217
 kmsan_internal_memmove_metadata+0x1f2/0x2e0 mm/kmsan/core.c:165
 __msan_memcpy+0x65/0x90 mm/kmsan/instrumentation.c:127
 sock_write_iter+0x605/0x690 net/socket.c:1062
 do_iter_readv_writev+0xa7f/0xc70
 do_iter_write+0x52c/0x1500 fs/read_write.c:851
 vfs_writev fs/read_write.c:924 [inline]
 do_writev+0x645/0xe00 fs/read_write.c:967
 __do_sys_writev fs/read_write.c:1040 [inline]
 __se_sys_writev fs/read_write.c:1037 [inline]
 __x64_sys_writev+0xe5/0x120 fs/read_write.c:1037
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable regs created at:
 __bpf_prog_run32+0x84/0x180 kernel/bpf/core.c:1796
 bpf_dispatcher_nop_func include/linux/bpf.h:785 [inline]
 __bpf_prog_run include/linux/filter.h:626 [inline]
 bpf_prog_run include/linux/filter.h:633 [inline]
 __bpf_prog_run_save_cb+0x168/0x580 include/linux/filter.h:756

CPU: 1 PID: 3474 Comm: syz-executor178 Not tainted 5.17.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================


---
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