On Tue, Jan 16, 2018 at 12:58 AM, syzbot <syzbot+cc298e15b6a571ba0c55@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzkaller hit the following crash on > 8418f88764046d0e8ca6a3c04a69a0e57189aa1e > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached > Raw console output is attached. > C reproducer is attached > syzkaller reproducer is attached. See https://goo.gl/kgGztJ > for information about syzkaller reproducers Most likely it is drivers/staging/android/ashmem.c which is guilty. So +ashmem maintainers. > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+cc298e15b6a571ba0c55@xxxxxxxxxxxxxxxxxxxxxxxxx > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. > > audit: type=1400 audit(1515720420.441:8): avc: denied { sys_admin } for > pid=3511 comm="syzkaller485245" capability=21 > scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 > tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns > permissive=1 > audit: type=1400 audit(1515720420.495:9): avc: denied { sys_chroot } for > pid=3512 comm="syzkaller485245" capability=18 > scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 > tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns > permissive=1 > ------------[ cut here ]------------ > memory commitment underflow > WARNING: CPU: 0 PID: 3512 at mm/util.c:606 __vm_enough_memory+0x5a6/0x810 > mm/util.c:604 > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 0 PID: 3512 Comm: syzkaller485245 Not tainted 4.15.0-rc7-next-20180111+ > #94 > 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+0x194/0x257 lib/dump_stack.c:53 > panic+0x1e4/0x41c kernel/panic.c:183 > __warn+0x1dc/0x200 kernel/panic.c:547 > report_bug+0x211/0x2d0 lib/bug.c:184 > fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178 > fixup_bug arch/x86/kernel/traps.c:247 [inline] > do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 > invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1102 > RIP: 0010:__vm_enough_memory+0x5a6/0x810 mm/util.c:604 > RSP: 0018:ffff8801bfbaf8e0 EFLAGS: 00010282 > RAX: dffffc0000000008 RBX: 1ffff10037f75f21 RCX: ffffffff815a613e > RDX: 0000000000000000 RSI: 1ffff10037e84d3b RDI: 0000000000000293 > RBP: ffff8801bfbafa90 R08: 1ffff10037f75eaf R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801bfbafa68 > R13: ffffffff869b8c80 R14: 0000000000000fff R15: dffffc0000000000 > security_vm_enough_memory_mm+0x90/0xb0 security/security.c:327 > mmap_region+0x321/0x15a0 mm/mmap.c:1666 > do_mmap+0x73c/0xf70 mm/mmap.c:1494 > do_mmap_pgoff include/linux/mm.h:2224 [inline] > vm_mmap_pgoff+0x1de/0x280 mm/util.c:333 > SYSC_mmap_pgoff mm/mmap.c:1544 [inline] > SyS_mmap_pgoff+0x23b/0x5f0 mm/mmap.c:1502 > SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] > SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91 > entry_SYSCALL_64_fastpath+0x29/0xa0 > RIP: 0033:0x440ac9 > RSP: 002b:00000000007dff58 EFLAGS: 00000212 ORIG_RAX: 0000000000000009 > RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000440ac9 > RDX: 0000000000000003 RSI: 0000000000fff000 RDI: 0000000020000000 > RBP: 7fffffffffffffff R08: 00000000ffffffff R09: 0000000000000000 > R10: 0000000000000032 R11: 0000000000000212 R12: 6873612f7665642f > R13: 6c616b7a79732f2e R14: 0000000000000000 R15: 0000000000000000 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. > If you forgot to add the Reported-by tag, once the fix for this bug is > merged > into any tree, please reply to this email with: > #syz fix: exact-commit-title > If you want to test a patch for this bug, please reply with: > #syz test: git://repo/address.git branch > and provide the patch inline or as an attachment. > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body. > > -- > 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@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/001a1144593661efb50562d9624f%40google.com. > For more options, visit https://groups.google.com/d/optout. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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