On Fri, Dec 22, 2017 at 01:37:02PM -0800, syzbot wrote: > Hello, > > syzkaller hit the following crash on > e7655085973bd33ee47bb12de663d31c81717404 > git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-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 > > > ================================================================== > BUG: KASAN: use-after-free in list_add include/linux/list.h:79 [inline] > BUG: KASAN: use-after-free in add_page_to_lru_list > include/linux/mm_inline.h:51 [inline] > BUG: KASAN: use-after-free in __pagevec_lru_add_fn+0xe49/0xf40 mm/swap.c:896 > Read of size 8 at addr ffff8801da2c36d0 by task modprobe/9844 > > CPU: 1 PID: 9844 Comm: modprobe Not tainted 4.15.0-rc3+ #157 > 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 > print_address_description+0x73/0x250 mm/kasan/report.c:252 > kasan_report_error mm/kasan/report.c:351 [inline] > kasan_report+0x25b/0x340 mm/kasan/report.c:409 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 > list_add include/linux/list.h:79 [inline] > add_page_to_lru_list include/linux/mm_inline.h:51 [inline] > __pagevec_lru_add_fn+0xe49/0xf40 mm/swap.c:896 > pagevec_lru_move_fn+0x13b/0x230 mm/swap.c:209 > __pagevec_lru_add mm/swap.c:907 [inline] > lru_add_drain_cpu+0x283/0x460 mm/swap.c:609 > lru_add_drain+0x1c/0x30 mm/swap.c:680 > shift_arg_pages+0x1c3/0x460 fs/exec.c:651 > setup_arg_pages+0x637/0x8e0 fs/exec.c:759 > load_elf_binary+0xaa6/0x4b50 fs/binfmt_elf.c:882 > search_binary_handler+0x142/0x6b0 fs/exec.c:1638 > exec_binprm fs/exec.c:1680 [inline] > do_execveat_common.isra.30+0x1754/0x23c0 fs/exec.c:1802 > do_execve+0x31/0x40 fs/exec.c:1847 > call_usermodehelper_exec_async+0x457/0x8f0 kernel/umh.c:100 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:441 > > Allocated by task 0: > save_stack+0x43/0xd0 mm/kasan/kasan.c:447 > set_track mm/kasan/kasan.c:459 [inline] > kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 > kmem_cache_alloc_node_trace+0x150/0x750 mm/slab.c:3653 > kmalloc_node include/linux/slab.h:537 [inline] > kzalloc_node include/linux/slab.h:699 [inline] > alloc_mem_cgroup_per_node_info mm/memcontrol.c:4167 [inline] > mem_cgroup_alloc+0x33e/0x9d0 mm/memcontrol.c:4234 > mem_cgroup_css_alloc+0x8ee/0xfe0 mm/memcontrol.c:4271 > cgroup_init_subsys+0x224/0x529 kernel/cgroup/cgroup.c:5152 > cgroup_init+0x3f3/0xb1b kernel/cgroup/cgroup.c:5278 > start_kernel+0x6da/0x754 init/main.c:700 > x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 > x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359 > secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 > > Freed by task 0: > (stack is not available) > This is yet another one where the reproducer is using AF_ALG and binding to the "pcrypt(gcm_base(ctr(aes-aesni),ghash-generic))" algorithm, so it's running into the pcrypt_free() bug which is causing slab cache corruption: https://groups.google.com/forum/#!topic/syzkaller-bugs/NKn_ivoPOpk https://patchwork.kernel.org/patch/10126761/ So let's mark it as a duplicate: #syz dup: KASAN: use-after-free Read in __list_del_entry_valid (2) Eric -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
