On Mon, Jul 9, 2018 at 5:09 AM, syzbot <syzbot+a95b989b2dde8e806af8@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: ca04b3cca11a Merge tag 'armsoc-fixes' of git://git.kernel... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=11e382e0400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=2ca6c7a31d407f86 > dashboard link: https://syzkaller.appspot.com/bug?extid=a95b989b2dde8e806af8 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > userspace arch: i386 > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1097c6fc400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=152d29b2400000 +9p maintianers > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+a95b989b2dde8e806af8@xxxxxxxxxxxxxxxxxxxxxxxxx > > sshd (4453) used greatest stack depth: 17048 bytes left > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > ================================================================== > BUG: KASAN: slab-out-of-bounds in fscache_set_key fs/fscache/cookie.c:120 > [inline] > BUG: KASAN: slab-out-of-bounds in fscache_alloc_cookie+0x7a9/0x880 > fs/fscache/cookie.c:171 > Read of size 4 at addr ffff8801d3cc8bb4 by task syz-executor907/4466 > > CPU: 1 PID: 4466 Comm: syz-executor907 Not tainted 4.18.0-rc3+ #40 > 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+0x1c9/0x2b4 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+0x242/0x2fe mm/kasan/report.c:412 > __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 > fscache_set_key fs/fscache/cookie.c:120 [inline] > fscache_alloc_cookie+0x7a9/0x880 fs/fscache/cookie.c:171 > __fscache_acquire_cookie+0x230/0xb00 fs/fscache/cookie.c:303 > fscache_acquire_cookie include/linux/fscache.h:338 [inline] > v9fs_cache_session_get_cookie+0xc4/0x270 fs/9p/cache.c:73 > v9fs_session_init+0x1013/0x1a80 fs/9p/v9fs.c:464 > v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 > mount_fs+0xae/0x328 fs/super.c:1277 > vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037 > vfs_kern_mount fs/namespace.c:1027 [inline] > do_new_mount fs/namespace.c:2518 [inline] > do_mount+0x581/0x30e0 fs/namespace.c:2848 > __do_compat_sys_mount fs/compat.c:125 [inline] > __se_compat_sys_mount fs/compat.c:92 [inline] > __ia32_compat_sys_mount+0x5d5/0x860 fs/compat.c:92 > do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] > do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 > entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 > RIP: 0023:0xf7f17cb9 > Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b > 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 > 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 > RSP: 002b:00000000ffafd7dc EFLAGS: 00000286 ORIG_RAX: 0000000000000015 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000020000280 > RDX: 00000000200002c0 RSI: 0000000000800000 RDI: 0000000020000340 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > > Allocated by task 4466: > 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 > __do_kmalloc mm/slab.c:3718 [inline] > __kmalloc+0x14e/0x760 mm/slab.c:3727 > kmalloc include/linux/slab.h:518 [inline] > kzalloc include/linux/slab.h:707 [inline] > fscache_set_key fs/fscache/cookie.c:101 [inline] > fscache_alloc_cookie+0x701/0x880 fs/fscache/cookie.c:171 > __fscache_acquire_cookie+0x230/0xb00 fs/fscache/cookie.c:303 > fscache_acquire_cookie include/linux/fscache.h:338 [inline] > v9fs_cache_session_get_cookie+0xc4/0x270 fs/9p/cache.c:73 > v9fs_session_init+0x1013/0x1a80 fs/9p/v9fs.c:464 > v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 > mount_fs+0xae/0x328 fs/super.c:1277 > vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037 > vfs_kern_mount fs/namespace.c:1027 [inline] > do_new_mount fs/namespace.c:2518 [inline] > do_mount+0x581/0x30e0 fs/namespace.c:2848 > __do_compat_sys_mount fs/compat.c:125 [inline] > __se_compat_sys_mount fs/compat.c:92 [inline] > __ia32_compat_sys_mount+0x5d5/0x860 fs/compat.c:92 > do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] > do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 > entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 > > 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 > __kthread_create_on_node+0x34a/0x4c0 kernel/kthread.c:337 > kthread_create_on_node+0xb1/0xe0 kernel/kthread.c:373 > cryptomgr_schedule_test crypto/algboss.c:255 [inline] > cryptomgr_notify+0x5ac/0xb90 crypto/algboss.c:276 > notifier_call_chain+0x180/0x390 kernel/notifier.c:93 > __blocking_notifier_call_chain kernel/notifier.c:317 [inline] > blocking_notifier_call_chain+0x147/0x190 kernel/notifier.c:328 > crypto_probing_notify+0x26/0x80 crypto/api.c:254 > crypto_wait_for_test+0x42/0xe0 crypto/algapi.c:361 > crypto_register_alg+0xc0/0xe0 crypto/algapi.c:392 > crypto_register_shash+0x35/0x50 crypto/shash.c:494 > crypto_register_shashes+0x5d/0xe0 crypto/shash.c:509 > register_sha512_ssse3 arch/x86/crypto/sha512_ssse3_glue.c:136 [inline] > sha512_ssse3_mod_init+0xc4/0x282 arch/x86/crypto/sha512_ssse3_glue.c:316 > do_one_initcall+0x127/0x913 init/main.c:884 > do_initcall_level init/main.c:952 [inline] > do_initcalls init/main.c:960 [inline] > do_basic_setup init/main.c:978 [inline] > kernel_init_freeable+0x49b/0x58e init/main.c:1135 > kernel_init+0x11/0x1b3 init/main.c:1061 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 > > The buggy address belongs to the object at ffff8801d3cc8b80 > which belongs to the cache kmalloc-64 of size 64 > The buggy address is located 52 bytes inside of > 64-byte region [ffff8801d3cc8b80, ffff8801d3cc8bc0) > The buggy address belongs to the page: > page:ffffea00074f3200 count:1 mapcount:0 mapping:ffff8801da800340 index:0x0 > flags: 0x2fffc0000000100(slab) > raw: 02fffc0000000100 ffffea000750d208 ffffea00074b1f08 ffff8801da800340 > raw: 0000000000000000 ffff8801d3cc8000 0000000100000020 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8801d3cc8a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff8801d3cc8b00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >> >> ffff8801d3cc8b80: 00 00 00 00 00 00 07 fc fc fc fc fc fc fc fc fc > > ^ > ffff8801d3cc8c00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc > ffff8801d3cc8c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ================================================================== > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches > > -- > 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/000000000000f98bc70570885526%40google.com. > For more options, visit https://groups.google.com/d/optout. -- Linux-cachefs mailing list Linux-cachefs@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cachefs
