From: Dmitry Vyukov <dvyukov@google.com>
To: Andrew Morton <akpm@linux-foundation.org>,
dave@stgolabs.net, dave.hansen@linux.intel.com,
Hugh Dickins <hughd@google.com>, Joe Perches <joe@perches.com>,
sds@tycho.nsa.gov, Oleg Nesterov <oleg@redhat.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Rik van Riel <riel@redhat.com>,
mhocko@suse.cz, gang.chen.5i5j@gmail.com,
Peter Feiner <pfeiner@google.com>,
aarcange@redhat.com, "linux-mm@kvack.org" <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Cc: syzkaller@googlegroups.com, Kostya Serebryany <kcc@google.com>,
Alexander Potapenko <glider@google.com>,
Andrey Konovalov <andreyknvl@google.com>,
Sasha Levin <sasha.levin@oracle.com>
Subject: GPF in shm_lock ipc
Date: Mon, 12 Oct 2015 11:55:44 +0200 [thread overview]
Message-ID: <CACT4Y+aqaR8QYk2nyN1n1iaSZWofBEkWuffvsfcqpvmGGQyMAw@mail.gmail.com> (raw)
Hello,
The following program crashes kernel:
// autogenerated by syzkaller (http://github.com/google/syzkaller)
#include <syscall.h>
#include <string.h>
#include <stdint.h>
int main()
{
long r0 = syscall(SYS_shmget, 0x0ul, 0x2ul, 0x8ul);
long r1 = syscall(SYS_shmat, r0, 0x20000000ul, 0x0ul);
long r2 = syscall(SYS_mremap, 0x20000000ul, 0x1000ul,
0x3000ul, 0x3ul, 0x207f9000ul);
long r19 = syscall(SYS_shmctl, r0, 0x0ul, 0);
long r20 = syscall(SYS_remap_file_pages, 0x207f9000ul,
0x3000ul, 0x0ul, 0x7ul, 0x0ul);
return 0;
}
On commit dd36d7393d6310b0c1adefb22fba79c3cf8a577c
(git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git)
------------[ cut here ]------------
WARNING: CPU: 2 PID: 2636 at ipc/shm.c:162 shm_open+0x74/0x80()
Modules linked in:
CPU: 2 PID: 2636 Comm: a.out Not tainted 4.3.0-rc3+ #37
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
ffffffff81bcb43c ffff88081bf0bd70 ffffffff812fe8d6 0000000000000000
ffff88081bf0bda8 ffffffff81051ff1 ffffffffffffffea ffff88081b896ca8
ffff880819b81620 ffff8800bbaa6d00 ffff880819b81600 ffff88081bf0bdb8
Call Trace:
[< inline >] __dump_stack lib/dump_stack.c:15
[<ffffffff812fe8d6>] dump_stack+0x44/0x5e lib/dump_stack.c:50
[<ffffffff81051ff1>] warn_slowpath_common+0x81/0xc0 kernel/panic.c:447
[<ffffffff810520e5>] warn_slowpath_null+0x15/0x20 kernel/panic.c:480
[< inline >] shm_lock ipc/shm.c:162
[<ffffffff81295c64>] shm_open+0x74/0x80 ipc/shm.c:196
[<ffffffff81295cbe>] shm_mmap+0x4e/0x80 ipc/shm.c:399 (discriminator 2)
[<ffffffff81142d14>] mmap_region+0x3c4/0x5e0 mm/mmap.c:1627
[<ffffffff81143227>] do_mmap+0x2f7/0x3d0 mm/mmap.c:1402
[< inline >] do_mmap_pgoff include/linux/mm.h:1930
[< inline >] SYSC_remap_file_pages mm/mmap.c:2694
[<ffffffff811434a9>] SyS_remap_file_pages+0x179/0x240 mm/mmap.c:2641
[<ffffffff81859a97>] entry_SYSCALL_64_fastpath+0x12/0x6a
arch/x86/entry/entry_64.S:185
---[ end trace 0873e743fc645a8c ]---
BUG: unable to handle kernel NULL pointer dereference at 000000000000003a
IP: [<ffffffff81295c25>] shm_open+0x35/0x80 ipc/shm.c:197
PGD 81a08b067 PUD 81a01b067 PMD 0
Oops: 0002 [#1] SMP
Modules linked in:
CPU: 2 PID: 2636 Comm: a.out Tainted: G W 4.3.0-rc3+ #37
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff880819b26800 ti: ffff88081bf08000 task.ti: ffff88081bf08000
RIP: 0010:[<ffffffff81295c25>] [<ffffffff81295c25>] shm_open+0x35/0x80
RSP: 0018:ffff88081bf0bdc8 EFLAGS: 00010296
RAX: 00000000560d1d13 RBX: ffffffffffffffea RCX: ffffffff8151e710
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000009
RBP: ffff88081bf0bdd0 R08: 000000000000000a R09: 0000000000000001
R10: 0000000000000000 R11: 00000000000001bc R12: ffff88081b896ca8
R13: ffff880819b81620 R14: ffff8800bbaa6d00 R15: ffff880819b81600
FS: 00007fbfd966f700(0000) GS:ffff88083fd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000003a CR3: 0000000819a97000 CR4: 00000000000006e0
Stack:
ffff880819b81200 ffff88081bf0bdf8 ffffffff81295cbe 0000000019b81620
ffff880819b81628 00000000207f9000 ffff88081bf0be80 ffffffff81142d14
ffff8800bbaa6d00 0000000000000007 0000000000000000 0000000000000007
Call Trace:
[<ffffffff81295cbe>] shm_mmap+0x4e/0x80 ipc/shm.c:399 (discriminator 2)
[<ffffffff81142d14>] mmap_region+0x3c4/0x5e0 mm/mmap.c:1627
[<ffffffff81143227>] do_mmap+0x2f7/0x3d0 mm/mmap.c:1402
[< inline >] do_mmap_pgoff include/linux/mm.h:1930
[< inline >] SYSC_remap_file_pages mm/mmap.c:2694
[<ffffffff811434a9>] SyS_remap_file_pages+0x179/0x240 mm/mmap.c:2641
[<ffffffff81859a97>] entry_SYSCALL_64_fastpath+0x12/0x6a
arch/x86/entry/entry_64.S:185
Code: 00 00 48 8b 80 d0 00 00 00 48 8b 50 08 8b 30 48 8d ba c8 00 00
00 e8 6b b1 ff ff 48 3d 00 f0 ff ff 48 89 c3 77 33 e8 5b 6b e1 ff <48>
89 43 50 65 48 8b 04 25 c0 ad 00 00 48 8b 80 40 04 00 00 48
RIP [<ffffffff81295c25>] shm_open+0x35/0x80 ipc/shm.c:197
RSP <ffff88081bf0bdc8>
CR2: 000000000000003a
---[ end trace 0873e743fc645a8d ]---
Found with syzkaller fuzzer.
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next reply other threads:[~2015-10-12 9:56 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-12 9:55 Dmitry Vyukov [this message]
2015-10-12 11:41 ` GPF in shm_lock ipc Vlastimil Babka
2015-10-12 11:44 ` Dmitry Vyukov
2015-10-12 12:27 ` Kirill A. Shutemov
2015-10-12 17:49 ` Davidlohr Bueso
2015-10-12 18:10 ` Kirill A. Shutemov
2015-10-12 18:55 ` Davidlohr Bueso
2015-10-13 3:18 ` Davidlohr Bueso
2015-10-13 12:30 ` Kirill A. Shutemov
2015-10-29 15:33 ` Dmitry Vyukov
2015-11-05 14:23 ` Kirill A. Shutemov
2015-12-21 15:44 ` Dmitry Vyukov
2016-01-02 11:33 ` Manfred Spraul
2016-01-02 12:19 ` Dmitry Vyukov
2016-01-02 15:58 ` Manfred Spraul
2016-02-02 3:25 ` Andrew Morton
2016-02-02 21:32 ` Dmitry Vyukov
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