On Sat, Jun 16, 2018 at 03:27:02AM -0700, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 8efcf34a2639 Merge tag 'armsoc-late' of git://git.kernel.o.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17b9503f800000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3de185e943e1d12f > dashboard link: https://syzkaller.appspot.com/bug?extid=264bca3a6e8d645550d3 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=158bc21f800000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12506eaf800000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+264bca3a6e8d645550d3@xxxxxxxxxxxxxxxxxxxxxxxxx > > ================================================================== > kasan: CONFIG_KASAN_INLINE enabled > BUG: KASAN: slab-out-of-bounds in memset include/linux/string.h:330 [inline] > BUG: KASAN: slab-out-of-bounds in vmac_final+0x161/0x26a0 crypto/vmac.c:611 > Write of size 18446744073709551516 at addr ffff8801ac760f0c by task > syz-executor345/4580 > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] SMP KASAN > > CPU: 1 PID: 4580 Comm: syz-executor345 Not tainted 4.17.0+ #98 > 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+0x242/0x2fe mm/kasan/report.c:412 > check_memory_region_inline mm/kasan/kasan.c:260 [inline] > check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 > memset+0x23/0x40 mm/kasan/kasan.c:285 > memset include/linux/string.h:330 [inline] > vmac_final+0x161/0x26a0 crypto/vmac.c:611 > crypto_shash_final+0x104/0x260 crypto/shash.c:152 > shash_async_final+0x35/0x40 crypto/shash.c:252 > crypto_ahash_op+0xcf/0x180 crypto/ahash.c:362 > crypto_ahash_final+0x57/0x70 crypto/ahash.c:367 > hash_sendmsg+0x750/0xac0 crypto/algif_hash.c:126 > sock_sendmsg_nosec net/socket.c:645 [inline] > sock_sendmsg+0xd5/0x120 net/socket.c:655 > ___sys_sendmsg+0x805/0x940 net/socket.c:2161 I have a fix for this almost ready to send out, but I need to do a bit more testing. I'll send it out soon. (The bug is that the VMAC template doesn't separate per-request state from per-tfm state.) Eric
