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Message-ID: <CACT4Y+a2H0WXdrK3CHn6UHXMA=cnU3+FaxB=qcq+yRQYRy+pAg@mail.gmail.com>
Date: Thu, 17 Dec 2015 13:58:31 +0100
From: Dmitry Vyukov <dvyukov@...gle.com>
To: Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Cc: syzkaller <syzkaller@...glegroups.com>,
Kostya Serebryany <kcc@...gle.com>,
Alexander Potapenko <glider@...gle.com>,
Eric Dumazet <edumazet@...gle.com>,
Sasha Levin <sasha.levin@...cle.com>,
Kees Cook <keescook@...gle.com>
Subject: bad page state due to PF_ALG socket
Hello,
The following program triggers multiple bugs including bad page state
warnings and GPFs:
// autogenerated by syzkaller (http://github.com/google/syzkaller)
#include <syscall.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
void foo()
{
long r0 = syscall(SYS_socket, 0x26ul, 0x5ul, 0x0ul, 0, 0, 0);
long r1 = syscall(SYS_mmap, 0x20000000ul, 0x10000ul, 0x3ul,
0x32ul, 0xfffffffffffffffful, 0x0ul);
*(uint16_t*)0x20001000 = 0x26;
memcpy((void*)0x20001002,
"\x73\x6b\x63\x69\x70\x68\x65\x72\x00\x00\x00\x00\x00\x00", 14);
*(uint32_t*)0x20001010 = 0xf;
*(uint32_t*)0x20001014 = 0x100;
memcpy((void*)0x20001018,
"\x65\x63\x62\x28\x73\x65\x72\x70\x65\x6e\x74\x29\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
64);
long r7 = syscall(SYS_bind, r0, 0x20001000ul, 0x58ul, 0, 0, 0);
long r8 = syscall(SYS_accept4, r0, 0x0ul, 0x200023fdul, 0x800ul, 0, 0);
memcpy((void*)0x20000000,
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4096);
memcpy((void*)0x20000000, "\x04\x00", 2);
long r11 = syscall(SYS_sendto, r8, 0x20000000ul, 0x1000ul,
0x4004ul, 0x20000000ul, 0x2ul);
memcpy((void*)0x20000ff9,
"\x01\x00\x2e\x2f\x66\x69\x6c\x65\x30\x00", 10);
long r13 = syscall(SYS_recvfrom, r8, 0x20002fbcul, 0x5aul,
0x10040ul, 0x20000ff9ul, 0xaul);
}
int main()
{
int i;
for (i = 0; i < 10; i++) {
if (fork() == 0)
foo();
}
}
BUG: Bad page state in process stress pfn:65d71
page:ffffea0001975c40 count:-1 mapcount:0 mapping: (null) index:0x0
flags: 0x5fffc0000000000()
page dumped because: nonzero _count
Modules linked in:
CPU: 3 PID: 6985 Comm: stress Not tainted 4.4.0-rc3+ #151
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
0000000000000003 ffff8800631a7430 ffffffff82e0f4b8 0000000041b58ab3
ffffffff87a9a265 ffffffff82e0f406 0000000000000000 0000000000000000
ffffffff86bc6e80 ffffea0001975c5c ffff8800631a7430 ffffffff817b53a5
Call Trace:
[< inline >] __dump_stack lib/dump_stack.c:15
[<ffffffff82e0f4b8>] dump_stack+0xb2/0xfa lib/dump_stack.c:50
[<ffffffff81725cc5>] bad_page+0x1c5/0x250 mm/page_alloc.c:438
[< inline >] check_new_page mm/page_alloc.c:1358
[< inline >] prep_new_page mm/page_alloc.c:1371
[<ffffffff81736bb3>] get_page_from_freelist+0xbb3/0x2790 mm/page_alloc.c:2584
[<ffffffff81738d31>] __alloc_pages_nodemask+0x2a1/0x1ad0 mm/page_alloc.c:3225
[<ffffffff81827aad>] alloc_pages_current+0xfd/0x3a0 mm/mempolicy.c:2055
[< inline >] alloc_pages include/linux/gfp.h:451
[< inline >] pmd_alloc_one ./arch/x86/include/asm/pgalloc.h:84
[<ffffffff817c1e88>] __pmd_alloc+0x28/0x390 mm/memory.c:3490
[< inline >] pmd_alloc include/linux/mm.h:1496
[< inline >] copy_pmd_range mm/memory.c:958
[< inline >] copy_pud_range mm/memory.c:999
[<ffffffff817c8738>] copy_page_range+0x12d8/0x1990 mm/memory.c:1061
[< inline >] dup_mmap kernel/fork.c:505
[< inline >] dup_mm kernel/fork.c:929
[< inline >] copy_mm kernel/fork.c:983
[<ffffffff8136efec>] copy_process+0x4f1c/0x6a90 kernel/fork.c:1450
[<ffffffff81370e5b>] _do_fork+0x14b/0xf00 kernel/fork.c:1727
[< inline >] SYSC_clone kernel/fork.c:1836
[<ffffffff81371ce7>] SyS_clone+0x37/0x50 kernel/fork.c:1830
[<ffffffff86a89fb6>] entry_SYSCALL_64_fastpath+0x16/0x7a
arch/x86/entry/entry_64.S:185
Disabling lock debugging due to kernel taint
BUG: Bad page state in process stress pfn:64f0d
page:ffffea000193c340 count:-1 mapcount:0 mapping: (null) index:0x0
flags: 0x5fffc0000000000()
page dumped because: nonzero _count
Modules linked in:
CPU: 2 PID: 7163 Comm: stress Tainted: G B 4.4.0-rc3+ #151
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
0000000000000002 ffff880036f2f6a0 ffffffff82e0f4b8 0000000041b58ab3
ffffffff87a9a265 ffffffff82e0f406 0000000000000000 0000000000000000
ffffffff86bc6e80 ffffea000193c35c ffff880036f2f6a0 ffffffff817b53a5
Call Trace:
[< inline >] __dump_stack lib/dump_stack.c:15
[<ffffffff82e0f4b8>] dump_stack+0xb2/0xfa lib/dump_stack.c:50
[<ffffffff81725cc5>] bad_page+0x1c5/0x250 mm/page_alloc.c:438
[< inline >] check_new_page mm/page_alloc.c:1358
[< inline >] prep_new_page mm/page_alloc.c:1371
[<ffffffff81736bb3>] get_page_from_freelist+0xbb3/0x2790 mm/page_alloc.c:2584
[<ffffffff81738d31>] __alloc_pages_nodemask+0x2a1/0x1ad0 mm/page_alloc.c:3225
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Modules linked in:
CPU: 3 PID: 7168 Comm: a.out Tainted: G B 4.4.0-rc3+ #151
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88003712ad00 ti: ffff8800331d8000 task.ti: ffff8800331d8000
RIP: 0010:[<ffffffff82d2d812>] [<ffffffff82d2d812>]
skcipher_recvmsg+0x82/0x1f10
RSP: 0018:ffff8800331dfb80 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: ffff88006b98f300 RCX: 0000000000010040
RDX: 0000000000000002 RSI: ffff8800331dfdc0 RDI: 0000000000000016
RBP: ffff8800331dfc80 R08: ffff8800331dfdd0 R09: 000000000000000a
R10: 0000000000010040 R11: 0000000000000246 R12: 0000000000000006
R13: ffff8800331dfdc0 R14: ffff8800331dfdc0 R15: 0000000000010040
FS: 0000000002630880(0063) GS:ffff88006cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 000000c8200d73b0 CR3: 0000000064c58000 CR4: 00000000000006e0
Stack:
ffff88006aba6024 ffff88006ab24520 ffff88006ab24510 ffff88006aba67e0
ffff88006aba602c ffffed000d574cfc 0000000000000000 ffff88006ab24518
ffff88006aba602d 0000000000001000 ffff88006ab24500 ffff88006aba6a48
Call Trace:
[< inline >] sock_recvmsg_nosec net/socket.c:712
[<ffffffff856b1c8a>] sock_recvmsg+0xaa/0xe0 net/socket.c:720
[<ffffffff856b2424>] SYSC_recvfrom+0x1e4/0x370 net/socket.c:1707
[<ffffffff856b7570>] SyS_recvfrom+0x40/0x50 net/socket.c:1681
[<ffffffff86a89fb6>] entry_SYSCALL_64_fastpath+0x16/0x7a
arch/x86/entry/entry_64.S:185
Code: 8b 45 c8 4c 8b 60 50 4d 85 e4 0f 84 0f 0a 00 00 e8 c4 a7 8d fe
49 8d 7c 24 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80>
3c 02 00 0f 85 ea 16 00 00 49 83 7c 24 10 00 0f 84 de 09 00
RIP [< inline >] is_sync_kiocb include/linux/fs.h:333
RIP [<ffffffff82d2d812>] skcipher_recvmsg+0x82/0x1f10
crypto/algif_skcipher.c:705
RSP <ffff8800331dfb80>
---[ end trace a867d3766397dba1 ]---
[<ffffffff81827aad>] alloc_pages_current+0xfd/0x3a0 mm/mempolicy.c:2055
[< inline >] alloc_pages include/linux/gfp.h:451
[<ffffffff8129e017>] pte_alloc_one+0x17/0xb0 arch/x86/mm/pgtable.c:28
[<ffffffff817bdbcd>] __pte_alloc+0x2d/0x450 mm/memory.c:568
[< inline >] __handle_mm_fault mm/memory.c:3400
[<ffffffff817c3aeb>] handle_mm_fault+0x18fb/0x4100 mm/memory.c:3442
[<ffffffff8129093c>] __do_page_fault+0x2ec/0x970 arch/x86/mm/fault.c:1238
[<ffffffff812910a3>] trace_do_page_fault+0xb3/0x3c0 arch/x86/mm/fault.c:1331
[<ffffffff81280584>] do_async_page_fault+0x14/0x70 arch/x86/kernel/kvm.c:264
[<ffffffff86a8bf18>] async_page_fault+0x28/0x30 arch/x86/entry/entry_64.S:977
On upstream commit 31ade3b83e1821da5fbb2f11b5b3d4ab2ec39db8 (Nov 29).
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