* KMSAN: uninit-value in vcs_read
@ 2018-05-15 16:26 syzbot
2018-11-08 16:47 ` Dmitry Vyukov
0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2018-05-15 16:26 UTC (permalink / raw)
To: gregkh, jslaby, kstewart, linux-kernel, pombredanne,
syzkaller-bugs, tglx, viro
Hello,
syzbot found the following crash on:
HEAD commit: e2ab7e8abba4 kmsan: temporarily disable visitAsmInstructio..
git tree: https://github.com/google/kmsan.git/master
console output: https://syzkaller.appspot.com/x/log.txt?x=158135db800000
kernel config: https://syzkaller.appspot.com/x/.config?x=5bf8b7964e37a698
dashboard link: https://syzkaller.appspot.com/bug?extid=fed4435f163beccc67eb
compiler: clang version 7.0.0 (trunk 329391)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=17a2f91b800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17bd452b800000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+fed4435f163beccc67eb@syzkaller.appspotmail.com
==================================================================
BUG: KMSAN: uninit-value in copy_to_user include/linux/uaccess.h:184
[inline]
BUG: KMSAN: uninit-value in vcs_read+0x18ba/0x1cc0
drivers/tty/vt/vc_screen.c:352
CPU: 1 PID: 3501 Comm: syzkaller315412 Not tainted 4.16.0+ #82
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x185/0x1d0 lib/dump_stack.c:53
kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
kmsan_internal_check_memory+0x125/0x1d0 mm/kmsan/kmsan.c:1157
kmsan_copy_to_user+0x69/0x160 mm/kmsan/kmsan.c:1199
copy_to_user include/linux/uaccess.h:184 [inline]
vcs_read+0x18ba/0x1cc0 drivers/tty/vt/vc_screen.c:352
__vfs_read+0x19f/0x8e0 fs/read_write.c:411
vfs_read+0x36c/0x6c0 fs/read_write.c:447
SYSC_pread64+0x275/0x310 fs/read_write.c:611
SyS_pread64+0x65/0x90 fs/read_write.c:598
do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x443d39
RSP: 002b:00007ffcbd3c35f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443d39
RDX: 0000000000000083 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0
R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004019e0
R13: 0000000000401a70 R14: 0000000000000000 R15: 0000000000000000
Uninit was stored to memory at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
__msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:521
vcs_read+0xd01/0x1cc0 drivers/tty/vt/vc_screen.c:274
__vfs_read+0x19f/0x8e0 fs/read_write.c:411
vfs_read+0x36c/0x6c0 fs/read_write.c:447
SYSC_pread64+0x275/0x310 fs/read_write.c:611
SyS_pread64+0x65/0x90 fs/read_write.c:598
do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Uninit was created at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
__kmalloc+0x23c/0x350 mm/slub.c:3791
kmalloc include/linux/slab.h:517 [inline]
vc_allocate+0x438/0x800 drivers/tty/vt/vt.c:787
con_install+0x8c/0x640 drivers/tty/vt/vt.c:2876
tty_driver_install_tty drivers/tty/tty_io.c:1224 [inline]
tty_init_dev+0x1b0/0x1020 drivers/tty/tty_io.c:1324
tty_open_by_driver drivers/tty/tty_io.c:1959 [inline]
tty_open+0x15e9/0x2ea0 drivers/tty/tty_io.c:2007
chrdev_open+0xc20/0xd90 fs/char_dev.c:417
do_dentry_open+0xcc6/0x1430 fs/open.c:752
vfs_open+0x1b7/0x2e0 fs/open.c:866
do_last fs/namei.c:3379 [inline]
path_openat+0x460a/0x6520 fs/namei.c:3520
do_filp_open+0x261/0x640 fs/namei.c:3554
do_sys_open+0x624/0x960 fs/open.c:1059
SYSC_open+0xab/0xc0 fs/open.c:1077
SyS_open+0x54/0x80 fs/open.c:1072
do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Bytes 0-79 of 131 are uninitialized
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: KMSAN: uninit-value in vcs_read
2018-05-15 16:26 KMSAN: uninit-value in vcs_read syzbot
@ 2018-11-08 16:47 ` Dmitry Vyukov
2018-11-08 16:48 ` syzbot
0 siblings, 1 reply; 4+ messages in thread
From: Dmitry Vyukov @ 2018-11-08 16:47 UTC (permalink / raw)
To: syzbot, Alexander Potapenko
Cc: Greg Kroah-Hartman, Jiri Slaby, Kate Stewart, LKML,
Philippe Ombredanne, syzkaller-bugs, Thomas Gleixner, Al Viro
On Tue, May 15, 2018 at 9:26 AM, syzbot
<syzbot+fed4435f163beccc67eb@syzkaller.appspotmail.com> wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: e2ab7e8abba4 kmsan: temporarily disable visitAsmInstructio..
> git tree: https://github.com/google/kmsan.git/master
> console output: https://syzkaller.appspot.com/x/log.txt?x=158135db800000
> kernel config: https://syzkaller.appspot.com/x/.config?x=5bf8b7964e37a698
> dashboard link: https://syzkaller.appspot.com/bug?extid=fed4435f163beccc67eb
> compiler: clang version 7.0.0 (trunk 329391)
> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=17a2f91b800000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17bd452b800000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+fed4435f163beccc67eb@syzkaller.appspotmail.com
#syz dup: KMSAN: kernel-infoleak in vcs_read
> ==================================================================
> BUG: KMSAN: uninit-value in copy_to_user include/linux/uaccess.h:184
> [inline]
> BUG: KMSAN: uninit-value in vcs_read+0x18ba/0x1cc0
> drivers/tty/vt/vc_screen.c:352
> CPU: 1 PID: 3501 Comm: syzkaller315412 Not tainted 4.16.0+ #82
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:17 [inline]
> dump_stack+0x185/0x1d0 lib/dump_stack.c:53
> kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
> kmsan_internal_check_memory+0x125/0x1d0 mm/kmsan/kmsan.c:1157
> kmsan_copy_to_user+0x69/0x160 mm/kmsan/kmsan.c:1199
> copy_to_user include/linux/uaccess.h:184 [inline]
> vcs_read+0x18ba/0x1cc0 drivers/tty/vt/vc_screen.c:352
> __vfs_read+0x19f/0x8e0 fs/read_write.c:411
> vfs_read+0x36c/0x6c0 fs/read_write.c:447
> SYSC_pread64+0x275/0x310 fs/read_write.c:611
> SyS_pread64+0x65/0x90 fs/read_write.c:598
> do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
> entry_SYSCALL_64_after_hwframe+0x3d/0xa2
> RIP: 0033:0x443d39
> RSP: 002b:00007ffcbd3c35f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000011
> RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443d39
> RDX: 0000000000000083 RSI: 0000000020000140 RDI: 0000000000000003
> RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0
> R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004019e0
> R13: 0000000000401a70 R14: 0000000000000000 R15: 0000000000000000
>
> Uninit was stored to memory at:
> kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
> kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
> kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
> __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:521
> vcs_read+0xd01/0x1cc0 drivers/tty/vt/vc_screen.c:274
> __vfs_read+0x19f/0x8e0 fs/read_write.c:411
> vfs_read+0x36c/0x6c0 fs/read_write.c:447
> SYSC_pread64+0x275/0x310 fs/read_write.c:611
> SyS_pread64+0x65/0x90 fs/read_write.c:598
> do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
> entry_SYSCALL_64_after_hwframe+0x3d/0xa2
> Uninit was created at:
> kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
> kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
> kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
> __kmalloc+0x23c/0x350 mm/slub.c:3791
> kmalloc include/linux/slab.h:517 [inline]
> vc_allocate+0x438/0x800 drivers/tty/vt/vt.c:787
> con_install+0x8c/0x640 drivers/tty/vt/vt.c:2876
> tty_driver_install_tty drivers/tty/tty_io.c:1224 [inline]
> tty_init_dev+0x1b0/0x1020 drivers/tty/tty_io.c:1324
> tty_open_by_driver drivers/tty/tty_io.c:1959 [inline]
> tty_open+0x15e9/0x2ea0 drivers/tty/tty_io.c:2007
> chrdev_open+0xc20/0xd90 fs/char_dev.c:417
> do_dentry_open+0xcc6/0x1430 fs/open.c:752
> vfs_open+0x1b7/0x2e0 fs/open.c:866
> do_last fs/namei.c:3379 [inline]
> path_openat+0x460a/0x6520 fs/namei.c:3520
> do_filp_open+0x261/0x640 fs/namei.c:3554
> do_sys_open+0x624/0x960 fs/open.c:1059
> SYSC_open+0xab/0xc0 fs/open.c:1077
> SyS_open+0x54/0x80 fs/open.c:1072
> do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
> entry_SYSCALL_64_after_hwframe+0x3d/0xa2
>
> Bytes 0-79 of 131 are uninitialized
> ==================================================================
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
> syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
> --
> You received this message because you are subscribed to the Google Groups
> "syzkaller-bugs" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to syzkaller-bugs+unsubscribe@googlegroups.com.
> To view this discussion on the web visit
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> For more options, visit https://groups.google.com/d/optout.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Re: KMSAN: uninit-value in vcs_read
2018-11-08 16:47 ` Dmitry Vyukov
@ 2018-11-08 16:48 ` syzbot
2018-11-08 16:56 ` Dmitry Vyukov
0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2018-11-08 16:48 UTC (permalink / raw)
To: Dmitry Vyukov
Cc: dvyukov, glider, gregkh, jslaby, kstewart, linux-kernel,
pombredanne, syzkaller-bugs, tglx, viro
> On Tue, May 15, 2018 at 9:26 AM, syzbot
> <syzbot+fed4435f163beccc67eb@syzkaller.appspotmail.com> wrote:
>> Hello,
>> syzbot found the following crash on:
>> HEAD commit: e2ab7e8abba4 kmsan: temporarily disable
>> visitAsmInstructio..
>> git tree: https://github.com/google/kmsan.git/master
>> console output: https://syzkaller.appspot.com/x/log.txt?x=158135db800000
>> kernel config:
>> https://syzkaller.appspot.com/x/.config?x=5bf8b7964e37a698
>> dashboard link:
>> https://syzkaller.appspot.com/bug?extid=fed4435f163beccc67eb
>> compiler: clang version 7.0.0 (trunk 329391)
>> syzkaller
>> repro:https://syzkaller.appspot.com/x/repro.syz?x=17a2f91b800000
>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17bd452b800000
>> IMPORTANT: if you fix the bug, please add the following tag to the
>> commit:
>> Reported-by: syzbot+fed4435f163beccc67eb@syzkaller.appspotmail.com
> #syz dup: KMSAN: kernel-infoleak in vcs_read
Can't dup bug to a bug in different reporting (upstream->moderation).Please
dup syzbot bugs only onto syzbot bugs for the same kernel/reporting.
>> ==================================================================
>> BUG: KMSAN: uninit-value in copy_to_user include/linux/uaccess.h:184
>> [inline]
>> BUG: KMSAN: uninit-value in vcs_read+0x18ba/0x1cc0
>> drivers/tty/vt/vc_screen.c:352
>> CPU: 1 PID: 3501 Comm: syzkaller315412 Not tainted 4.16.0+ #82
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> Call Trace:
>> __dump_stack lib/dump_stack.c:17 [inline]
>> dump_stack+0x185/0x1d0 lib/dump_stack.c:53
>> kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
>> kmsan_internal_check_memory+0x125/0x1d0 mm/kmsan/kmsan.c:1157
>> kmsan_copy_to_user+0x69/0x160 mm/kmsan/kmsan.c:1199
>> copy_to_user include/linux/uaccess.h:184 [inline]
>> vcs_read+0x18ba/0x1cc0 drivers/tty/vt/vc_screen.c:352
>> __vfs_read+0x19f/0x8e0 fs/read_write.c:411
>> vfs_read+0x36c/0x6c0 fs/read_write.c:447
>> SYSC_pread64+0x275/0x310 fs/read_write.c:611
>> SyS_pread64+0x65/0x90 fs/read_write.c:598
>> do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
>> entry_SYSCALL_64_after_hwframe+0x3d/0xa2
>> RIP: 0033:0x443d39
>> RSP: 002b:00007ffcbd3c35f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000011
>> RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443d39
>> RDX: 0000000000000083 RSI: 0000000020000140 RDI: 0000000000000003
>> RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0
>> R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004019e0
>> R13: 0000000000401a70 R14: 0000000000000000 R15: 0000000000000000
>> Uninit was stored to memory at:
>> kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
>> kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
>> kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
>> __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:521
>> vcs_read+0xd01/0x1cc0 drivers/tty/vt/vc_screen.c:274
>> __vfs_read+0x19f/0x8e0 fs/read_write.c:411
>> vfs_read+0x36c/0x6c0 fs/read_write.c:447
>> SYSC_pread64+0x275/0x310 fs/read_write.c:611
>> SyS_pread64+0x65/0x90 fs/read_write.c:598
>> do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
>> entry_SYSCALL_64_after_hwframe+0x3d/0xa2
>> Uninit was created at:
>> kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
>> kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
>> kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
>> __kmalloc+0x23c/0x350 mm/slub.c:3791
>> kmalloc include/linux/slab.h:517 [inline]
>> vc_allocate+0x438/0x800 drivers/tty/vt/vt.c:787
>> con_install+0x8c/0x640 drivers/tty/vt/vt.c:2876
>> tty_driver_install_tty drivers/tty/tty_io.c:1224 [inline]
>> tty_init_dev+0x1b0/0x1020 drivers/tty/tty_io.c:1324
>> tty_open_by_driver drivers/tty/tty_io.c:1959 [inline]
>> tty_open+0x15e9/0x2ea0 drivers/tty/tty_io.c:2007
>> chrdev_open+0xc20/0xd90 fs/char_dev.c:417
>> do_dentry_open+0xcc6/0x1430 fs/open.c:752
>> vfs_open+0x1b7/0x2e0 fs/open.c:866
>> do_last fs/namei.c:3379 [inline]
>> path_openat+0x460a/0x6520 fs/namei.c:3520
>> do_filp_open+0x261/0x640 fs/namei.c:3554
>> do_sys_open+0x624/0x960 fs/open.c:1059
>> SYSC_open+0xab/0xc0 fs/open.c:1077
>> SyS_open+0x54/0x80 fs/open.c:1072
>> do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
>> entry_SYSCALL_64_after_hwframe+0x3d/0xa2
>> Bytes 0-79 of 131 are uninitialized
>> ==================================================================
>> ---
>> This bug is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at syzkaller@googlegroups.com.
>> syzbot will keep track of this bug report. See:
>> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
>> syzbot.
>> syzbot can test patches for this bug, for details see:
>> https://goo.gl/tpsmEJ#testing-patches
>> --
>> You received this message because you are subscribed to the Google Groups
>> "syzkaller-bugs" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to syzkaller-bugs+unsubscribe@googlegroups.com.
>> To view this discussion on the web visit
>> https://groups.google.com/d/msgid/syzkaller-bugs/000000000000da269e056c410efd%40google.com.
>> For more options, visit https://groups.google.com/d/optout.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Re: KMSAN: uninit-value in vcs_read
2018-11-08 16:48 ` syzbot
@ 2018-11-08 16:56 ` Dmitry Vyukov
0 siblings, 0 replies; 4+ messages in thread
From: Dmitry Vyukov @ 2018-11-08 16:56 UTC (permalink / raw)
To: syzbot
Cc: Alexander Potapenko, Greg Kroah-Hartman, Jiri Slaby,
Kate Stewart, LKML, Philippe Ombredanne, syzkaller-bugs,
Thomas Gleixner, Al Viro
On Thu, Nov 8, 2018 at 8:48 AM, syzbot
<syzbot+fed4435f163beccc67eb@syzkaller.appspotmail.com> wrote:
>> On Tue, May 15, 2018 at 9:26 AM, syzbot
>> <syzbot+fed4435f163beccc67eb@syzkaller.appspotmail.com> wrote:
>>>
>>> Hello,
>
>
>>> syzbot found the following crash on:
>
>
>>> HEAD commit: e2ab7e8abba4 kmsan: temporarily disable
>>> visitAsmInstructio..
>>> git tree: https://github.com/google/kmsan.git/master
>>> console output: https://syzkaller.appspot.com/x/log.txt?x=158135db800000
>>> kernel config:
>>> https://syzkaller.appspot.com/x/.config?x=5bf8b7964e37a698
>>> dashboard link:
>>> https://syzkaller.appspot.com/bug?extid=fed4435f163beccc67eb
>>> compiler: clang version 7.0.0 (trunk 329391)
>>> syzkaller
>>> repro:https://syzkaller.appspot.com/x/repro.syz?x=17a2f91b800000
>>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17bd452b800000
>
>
>>> IMPORTANT: if you fix the bug, please add the following tag to the
>>> commit:
>>> Reported-by: syzbot+fed4435f163beccc67eb@syzkaller.appspotmail.com
>
>
>> #syz dup: KMSAN: kernel-infoleak in vcs_read
>
>
> Can't dup bug to a bug in different reporting (upstream->moderation).Please
> dup syzbot bugs only onto syzbot bugs for the same kernel/reporting.
Let's try this:
#syz fix: vt: prevent leaking uninitialized data to userspace via /dev/vcs*
>>> ==================================================================
>>> BUG: KMSAN: uninit-value in copy_to_user include/linux/uaccess.h:184
>>> [inline]
>>> BUG: KMSAN: uninit-value in vcs_read+0x18ba/0x1cc0
>>> drivers/tty/vt/vc_screen.c:352
>>> CPU: 1 PID: 3501 Comm: syzkaller315412 Not tainted 4.16.0+ #82
>>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>>> Google 01/01/2011
>>> Call Trace:
>>> __dump_stack lib/dump_stack.c:17 [inline]
>>> dump_stack+0x185/0x1d0 lib/dump_stack.c:53
>>> kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
>>> kmsan_internal_check_memory+0x125/0x1d0 mm/kmsan/kmsan.c:1157
>>> kmsan_copy_to_user+0x69/0x160 mm/kmsan/kmsan.c:1199
>>> copy_to_user include/linux/uaccess.h:184 [inline]
>>> vcs_read+0x18ba/0x1cc0 drivers/tty/vt/vc_screen.c:352
>>> __vfs_read+0x19f/0x8e0 fs/read_write.c:411
>>> vfs_read+0x36c/0x6c0 fs/read_write.c:447
>>> SYSC_pread64+0x275/0x310 fs/read_write.c:611
>>> SyS_pread64+0x65/0x90 fs/read_write.c:598
>>> do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
>>> entry_SYSCALL_64_after_hwframe+0x3d/0xa2
>>> RIP: 0033:0x443d39
>>> RSP: 002b:00007ffcbd3c35f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000011
>>> RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443d39
>>> RDX: 0000000000000083 RSI: 0000000020000140 RDI: 0000000000000003
>>> RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0
>>> R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004019e0
>>> R13: 0000000000401a70 R14: 0000000000000000 R15: 0000000000000000
>
>
>>> Uninit was stored to memory at:
>>> kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
>>> kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
>>> kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
>>> __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:521
>>> vcs_read+0xd01/0x1cc0 drivers/tty/vt/vc_screen.c:274
>>> __vfs_read+0x19f/0x8e0 fs/read_write.c:411
>>> vfs_read+0x36c/0x6c0 fs/read_write.c:447
>>> SYSC_pread64+0x275/0x310 fs/read_write.c:611
>>> SyS_pread64+0x65/0x90 fs/read_write.c:598
>>> do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
>>> entry_SYSCALL_64_after_hwframe+0x3d/0xa2
>>> Uninit was created at:
>>> kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
>>> kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
>>> kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
>>> __kmalloc+0x23c/0x350 mm/slub.c:3791
>>> kmalloc include/linux/slab.h:517 [inline]
>>> vc_allocate+0x438/0x800 drivers/tty/vt/vt.c:787
>>> con_install+0x8c/0x640 drivers/tty/vt/vt.c:2876
>>> tty_driver_install_tty drivers/tty/tty_io.c:1224 [inline]
>>> tty_init_dev+0x1b0/0x1020 drivers/tty/tty_io.c:1324
>>> tty_open_by_driver drivers/tty/tty_io.c:1959 [inline]
>>> tty_open+0x15e9/0x2ea0 drivers/tty/tty_io.c:2007
>>> chrdev_open+0xc20/0xd90 fs/char_dev.c:417
>>> do_dentry_open+0xcc6/0x1430 fs/open.c:752
>>> vfs_open+0x1b7/0x2e0 fs/open.c:866
>>> do_last fs/namei.c:3379 [inline]
>>> path_openat+0x460a/0x6520 fs/namei.c:3520
>>> do_filp_open+0x261/0x640 fs/namei.c:3554
>>> do_sys_open+0x624/0x960 fs/open.c:1059
>>> SYSC_open+0xab/0xc0 fs/open.c:1077
>>> SyS_open+0x54/0x80 fs/open.c:1072
>>> do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
>>> entry_SYSCALL_64_after_hwframe+0x3d/0xa2
>
>
>>> Bytes 0-79 of 131 are uninitialized
>>> ==================================================================
>
>
>
>>> ---
>>> This bug is generated by a bot. It may contain errors.
>>> See https://goo.gl/tpsmEJ for more information about syzbot.
>>> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
>
>>> syzbot will keep track of this bug report. See:
>>> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
>>> syzbot.
>>> syzbot can test patches for this bug, for details see:
>>> https://goo.gl/tpsmEJ#testing-patches
>
>
>>> --
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>>> To unsubscribe from this group and stop receiving emails from it, send an
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>>> To view this discussion on the web visit
>>>
>>> https://groups.google.com/d/msgid/syzkaller-bugs/000000000000da269e056c410efd%40google.com.
>>> For more options, visit https://groups.google.com/d/optout.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2018-11-08 16:56 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-05-15 16:26 KMSAN: uninit-value in vcs_read syzbot
2018-11-08 16:47 ` Dmitry Vyukov
2018-11-08 16:48 ` syzbot
2018-11-08 16:56 ` Dmitry Vyukov
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