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    SubjectRe: KASAN: slab-out-of-bounds Write in process_preds
    On Wed, Apr 11, 2018 at 2:02 PM, syzbot
    <syzbot+5702a7e6d4a13b3accd5@syzkaller.appspotmail.com> wrote:
    > Hello,
    >
    > syzbot hit the following crash on upstream commit
    > b284d4d5a6785f8cd07eda2646a95782373cd01e (Tue Apr 10 19:25:30 2018 +0000)
    > Merge tag 'ceph-for-4.17-rc1' of git://github.com/ceph/ceph-client
    > syzbot dashboard link:
    > https://syzkaller.appspot.com/bug?extid=5702a7e6d4a13b3accd5
    >
    > So far this crash happened 4 times on upstream.
    > C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6364313065357312
    > syzkaller reproducer:
    > https://syzkaller.appspot.com/x/repro.syz?id=4775648954417152
    > Raw console output:
    > https://syzkaller.appspot.com/x/log.txt?id=6353070183153664
    > Kernel config:
    > https://syzkaller.appspot.com/x/.config?id=-1223000601505858474
    > compiler: gcc (GCC) 8.0.1 20180301 (experimental)
    >
    > IMPORTANT: if you fix the bug, please add the following tag to the commit:
    > Reported-by: syzbot+5702a7e6d4a13b3accd5@syzkaller.appspotmail.com
    > 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.


    This was bisected to:

    commit 80765597bc587feae8dbc8ce97a0f32e12a6e625
    Author: Steven Rostedt (VMware) <rostedt@goodmis.org>
    Date: Fri Mar 9 13:19:28 2018 -0500

    tracing: Rewrite filter logic to be simpler and faster



    > ==================================================================
    > BUG: KASAN: slab-out-of-bounds in predicate_parse
    > kernel/trace/trace_events_filter.c:557 [inline]
    > BUG: KASAN: slab-out-of-bounds in process_preds+0x1958/0x19b0
    > kernel/trace/trace_events_filter.c:1505
    > Write of size 4 at addr ffff8801ceecdef0 by task syzkaller992239/4513
    >
    > CPU: 0 PID: 4513 Comm: syzkaller992239 Not tainted 4.16.0+ #17
    > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
    > Google 01/01/2011
    > Call Trace:
    > __dump_stack lib/dump_stack.c:77 [inline]
    > dump_stack+0x1b9/0x294 lib/dump_stack.c:113
    > print_address_description+0x6c/0x20b mm/kasan/report.c:256
    > kasan_report_error mm/kasan/report.c:354 [inline]
    > kasan_report.cold.7+0xac/0x2f5 mm/kasan/report.c:412
    > __asan_report_store4_noabort+0x17/0x20 mm/kasan/report.c:437
    > predicate_parse kernel/trace/trace_events_filter.c:557 [inline]
    > process_preds+0x1958/0x19b0 kernel/trace/trace_events_filter.c:1505
    > create_filter+0x1a8/0x370 kernel/trace/trace_events_filter.c:1714
    > ftrace_profile_set_filter+0x109/0x2b0
    > kernel/trace/trace_events_filter.c:2042
    > perf_event_set_filter+0x248/0x1230 kernel/events/core.c:9064
    > _perf_ioctl+0x84c/0x1650 kernel/events/core.c:5056
    > perf_ioctl+0x59/0x80 kernel/events/core.c:5107
    > vfs_ioctl fs/ioctl.c:46 [inline]
    > file_ioctl fs/ioctl.c:500 [inline]
    > do_vfs_ioctl+0x1cf/0x1650 fs/ioctl.c:684
    > ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
    > SYSC_ioctl fs/ioctl.c:708 [inline]
    > SyS_ioctl+0x24/0x30 fs/ioctl.c:706
    > do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
    > entry_SYSCALL_64_after_hwframe+0x42/0xb7
    > RIP: 0033:0x43fdb9
    > RSP: 002b:00007ffc7afb3e88 EFLAGS: 00000213 ORIG_RAX: 0000000000000010
    > RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9
    > RDX: 0000000020000040 RSI: 0000000040082406 RDI: 0000000000000003
    > RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
    > R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004016e0
    > R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000
    >
    > Allocated by task 1:
    > save_stack+0x43/0xd0 mm/kasan/kasan.c:448
    > set_track mm/kasan/kasan.c:460 [inline]
    > kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
    > kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620
    > kmalloc include/linux/slab.h:512 [inline]
    > call_modprobe kernel/kmod.c:80 [inline]
    > __request_module+0x386/0xcdd kernel/kmod.c:171
    > adfdrv_init+0x1b/0x5f drivers/crypto/qat/qat_dh895xcc/adf_drv.c:315
    > do_one_initcall+0x127/0x913 init/main.c:880
    > do_initcall_level init/main.c:948 [inline]
    > do_initcalls init/main.c:956 [inline]
    > do_basic_setup init/main.c:974 [inline]
    > kernel_init_freeable+0x49b/0x58e init/main.c:1124
    > kernel_init+0x11/0x1b3 init/main.c:1050
    > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411
    >
    > Freed by task 1:
    > save_stack+0x43/0xd0 mm/kasan/kasan.c:448
    > set_track mm/kasan/kasan.c:460 [inline]
    > __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
    > kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
    > __cache_free mm/slab.c:3498 [inline]
    > kfree+0xd9/0x260 mm/slab.c:3813
    > free_modprobe_argv+0x74/0xa0 kernel/kmod.c:67
    > call_usermodehelper_freeinfo kernel/umh.c:42 [inline]
    > call_usermodehelper_exec+0x274/0x4f0 kernel/umh.c:458
    > call_modprobe kernel/kmod.c:99 [inline]
    > __request_module+0x4ba/0xcdd kernel/kmod.c:171
    > adfdrv_init+0x1b/0x5f drivers/crypto/qat/qat_dh895xcc/adf_drv.c:315
    > do_one_initcall+0x127/0x913 init/main.c:880
    > do_initcall_level init/main.c:948 [inline]
    > do_initcalls init/main.c:956 [inline]
    > do_basic_setup init/main.c:974 [inline]
    > kernel_init_freeable+0x49b/0x58e init/main.c:1124
    > kernel_init+0x11/0x1b3 init/main.c:1050
    > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411
    >
    > The buggy address belongs to the object at ffff8801ceecde80
    > which belongs to the cache kmalloc-64 of size 64
    > The buggy address is located 48 bytes to the right of
    > 64-byte region [ffff8801ceecde80, ffff8801ceecdec0)
    > The buggy address belongs to the page:
    > page:ffffea00073bb340 count:1 mapcount:0 mapping:ffff8801ceecd000 index:0x0
    > flags: 0x2fffc0000000100(slab)
    > raw: 02fffc0000000100 ffff8801ceecd000 0000000000000000 0000000100000020
    > raw: ffffea0007392ba0 ffffea0007509220 ffff8801dac00340 0000000000000000
    > page dumped because: kasan: bad access detected
    >
    > Memory state around the buggy address:
    > ffff8801ceecdd80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
    > ffff8801ceecde00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
    >>
    >> ffff8801ceecde80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
    >
    > ^
    > ffff8801ceecdf00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
    > ffff8801ceecdf80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
    > ==================================================================
    >
    >
    > ---
    > This bug is generated by a dumb bot. It may contain errors.
    > See https://goo.gl/tpsmEJ for details.
    > Direct all questions to syzkaller@googlegroups.com.
    >
    > 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.
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