linux-kernel - [syzbot] usb-testing boot error: general protection fault in alloc

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Message-ID: <00000000000086ea5105e6d9bb44@google.com>
Date:   Mon, 22 Aug 2022 12:48:32 -0700
From:   syzbot <syzbot+b3c801d39e8c3daed0fa@...kaller.appspotmail.com>
To:     ebiederm@...ssion.com, keescook@...omium.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-usb@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: [syzbot] usb-testing boot error: general protection fault in alloc_bprm

Hello,

syzbot found the following issue on:

HEAD commit:    ad57410d231d usb: gadget: rndis: use %u instead of %d to p..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
console output: https://syzkaller.appspot.com/x/log.txt?x=17c13aa5080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3cb39b084894e9a5
dashboard link: https://syzkaller.appspot.com/bug?extid=b3c801d39e8c3daed0fa
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b3c801d39e8c3daed0fa@...kaller.appspotmail.com

general protection fault, probably for non-canonical address 0xffff000000000100: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0xfff8200000000800-0xfff8200000000807]
CPU: 1 PID: 375 Comm: kworker/u4:0 Not tainted 6.0.0-rc1-syzkaller-00005-gad57410d231d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:freelist_dereference mm/slub.c:347 [inline]
RIP: 0010:get_freepointer mm/slub.c:354 [inline]
RIP: 0010:get_freepointer_safe mm/slub.c:368 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:3211 [inline]
RIP: 0010:slab_alloc mm/slub.c:3251 [inline]
RIP: 0010:kmem_cache_alloc_trace+0x15e/0x3b0 mm/slub.c:3282
Code: 8b 51 08 48 8b 01 48 83 79 10 00 48 89 44 24 08 0f 84 9d 01 00 00 48 85 c0 0f 84 94 01 00 00 48 8b 7d 00 8b 4d 28 40 f6 c7 0f <48> 8b 1c 08 0f 85 a0 01 00 00 48 8d 4a 08 65 48 0f c7 0f 0f 94 c0
RSP: 0000:ffffc900018afe28 EFLAGS: 00010246
RAX: ffff000000000000 RBX: ffff88810eae1100 RCX: 0000000000000100
RDX: 0000000000001411 RSI: 0000000000000dc0 RDI: 000000000003b380
RBP: ffff888100041c80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000dc0
R13: 00000000000001a0 R14: 0000000000000dc0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000007825000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kmalloc include/linux/slab.h:600 [inline]
 kzalloc include/linux/slab.h:733 [inline]
 alloc_bprm+0x51/0x900 fs/exec.c:1514
 kernel_execve+0xab/0x500 fs/exec.c:1974
 call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Modules linked in:

---[ end trace 0000000000000000 ]---
RIP: 0010:freelist_dereference mm/slub.c:347 [inline]
RIP: 0010:get_freepointer mm/slub.c:354 [inline]
RIP: 0010:get_freepointer_safe mm/slub.c:368 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:3211 [inline]
RIP: 0010:slab_alloc mm/slub.c:3251 [inline]
RIP: 0010:kmem_cache_alloc_trace+0x15e/0x3b0 mm/slub.c:3282
Code: 8b 51 08 48 8b 01 48 83 79 10 00 48 89 44 24 08 0f 84 9d 01 00 00 48 85 c0 0f 84 94 01 00 00 48 8b 7d 00 8b 4d 28 40 f6 c7 0f <48> 8b 1c 08 0f 85 a0 01 00 00 48 8d 4a 08 65 48 0f c7 0f 0f 94 c0
RSP: 0000:ffffc900018afe28 EFLAGS: 00010246

RAX: ffff000000000000 RBX: ffff88810eae1100 RCX: 0000000000000100
RDX: 0000000000001411 RSI: 0000000000000dc0 RDI: 000000000003b380
RBP: ffff888100041c80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000dc0
R13: 00000000000001a0 R14: 0000000000000dc0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000007825000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8b 51 08             	mov    0x8(%rcx),%edx
   3:	48 8b 01             	mov    (%rcx),%rax
   6:	48 83 79 10 00       	cmpq   $0x0,0x10(%rcx)
   b:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  10:	0f 84 9d 01 00 00    	je     0x1b3
  16:	48 85 c0             	test   %rax,%rax
  19:	0f 84 94 01 00 00    	je     0x1b3
  1f:	48 8b 7d 00          	mov    0x0(%rbp),%rdi
  23:	8b 4d 28             	mov    0x28(%rbp),%ecx
  26:	40 f6 c7 0f          	test   $0xf,%dil
* 2a:	48 8b 1c 08          	mov    (%rax,%rcx,1),%rbx <-- trapping instruction
  2e:	0f 85 a0 01 00 00    	jne    0x1d4
  34:	48 8d 4a 08          	lea    0x8(%rdx),%rcx
  38:	65 48 0f c7 0f       	cmpxchg16b %gs:(%rdi)
  3d:	0f 94 c0             	sete   %al


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