On Thu, Mar 23, 2017 at 2:06 PM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > Hello, > > I've got the following report while running syzkaller fuzzer on > 093b995e3b55a0ae0670226ddfcb05bfbf0099ae. Note the preceding injected > kmalloc failure in inode_alloc_security, most likely it's the root > cause. > > > FAULT_INJECTION: forcing a failure. > name failslab, interval 1, probability 0, space 0, times 0 > CPU: 3 PID: 14086 Comm: syz-executor6 Not tainted 4.11.0-rc3+ #364 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:16 [inline] > dump_stack+0x1b8/0x28d lib/dump_stack.c:52 > fail_dump lib/fault-inject.c:45 [inline] > should_fail+0x78a/0x870 lib/fault-inject.c:154 > should_failslab+0xec/0x120 mm/failslab.c:31 > slab_pre_alloc_hook mm/slab.h:434 [inline] > slab_alloc mm/slab.c:3394 [inline] > kmem_cache_alloc+0x200/0x720 mm/slab.c:3570 > kmem_cache_zalloc include/linux/slab.h:653 [inline] > inode_alloc_security security/selinux/hooks.c:221 [inline] > selinux_inode_alloc_security+0xf9/0x390 security/selinux/hooks.c:2833 > security_inode_alloc+0x90/0xd0 security/security.c:387 > inode_init_always+0x5af/0xc20 fs/inode.c:166 > alloc_inode+0x82/0x180 fs/inode.c:214 > new_inode_pseudo+0x69/0x190 fs/inode.c:889 > new_inode+0x1c/0x40 fs/inode.c:918 > hugetlbfs_get_inode+0x40/0x420 fs/hugetlbfs/inode.c:734 > hugetlb_file_setup+0x329/0x9f0 fs/hugetlbfs/inode.c:1282 > newseg+0x422/0xd30 ipc/shm.c:575 > ipcget_new ipc/util.c:285 [inline] > ipcget+0x21e/0x580 ipc/util.c:639 > SYSC_shmget ipc/shm.c:673 [inline] > SyS_shmget+0x158/0x230 ipc/shm.c:657 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > RIP: 0033:0x445b79 > RSP: 002b:00007f9dcc5df858 EFLAGS: 00000282 ORIG_RAX: 000000000000001d > RAX: ffffffffffffffda RBX: 0000000000708000 RCX: 0000000000445b79 > RDX: 0000000000000800 RSI: 0000000000003000 RDI: 0000000000000000 > RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000020207000 R11: 0000000000000282 R12: 00000000004a7e31 > R13: 0000000000000000 R14: 00007f9dcc5df618 R15: 00007f9dcc5df788 > ================================================================== > BUG: KASAN: user-memory-access in atomic_inc > include/asm-generic/atomic-instrumented.h:87 [inline] at addr > 000000131730bd7a > BUG: KASAN: user-memory-access in __lock_acquire+0x21a/0x3a80 > kernel/locking/lockdep.c:3239 at addr 000000131730bd7a > Write of size 4 by task syz-executor6/14086 > CPU: 3 PID: 14086 Comm: syz-executor6 Not tainted 4.11.0-rc3+ #364 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:16 [inline] > dump_stack+0x1b8/0x28d lib/dump_stack.c:52 > kasan_report_error mm/kasan/report.c:291 [inline] > kasan_report.part.2+0x34a/0x480 mm/kasan/report.c:316 > kasan_report+0x21/0x30 mm/kasan/report.c:303 > check_memory_region_inline mm/kasan/kasan.c:326 [inline] > check_memory_region+0x137/0x190 mm/kasan/kasan.c:333 > kasan_check_write+0x14/0x20 mm/kasan/kasan.c:344 > atomic_inc include/asm-generic/atomic-instrumented.h:87 [inline] > __lock_acquire+0x21a/0x3a80 kernel/locking/lockdep.c:3239 > lock_acquire+0x1ee/0x590 kernel/locking/lockdep.c:3762 > __raw_write_lock include/linux/rwlock_api_smp.h:210 [inline] > _raw_write_lock+0x33/0x50 kernel/locking/spinlock.c:295 > mpol_free_shared_policy+0x43/0xb0 mm/mempolicy.c:2536 > hugetlbfs_destroy_inode+0xca/0x120 fs/hugetlbfs/inode.c:952 > alloc_inode+0x10d/0x180 fs/inode.c:216 > new_inode_pseudo+0x69/0x190 fs/inode.c:889 > new_inode+0x1c/0x40 fs/inode.c:918 > hugetlbfs_get_inode+0x40/0x420 fs/hugetlbfs/inode.c:734 > hugetlb_file_setup+0x329/0x9f0 fs/hugetlbfs/inode.c:1282 > newseg+0x422/0xd30 ipc/shm.c:575 > ipcget_new ipc/util.c:285 [inline] > ipcget+0x21e/0x580 ipc/util.c:639 > SYSC_shmget ipc/shm.c:673 [inline] > SyS_shmget+0x158/0x230 ipc/shm.c:657 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > RIP: 0033:0x445b79 > RSP: 002b:00007f9dcc5df858 EFLAGS: 00000282 ORIG_RAX: 000000000000001d > RAX: ffffffffffffffda RBX: 0000000000708000 RCX: 0000000000445b79 > RDX: 0000000000000800 RSI: 0000000000003000 RDI: 0000000000000000 > RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000020207000 R11: 0000000000000282 R12: 00000000004a7e31 > R13: 0000000000000000 R14: 00007f9dcc5df618 R15: 00007f9dcc5df788 > ================================================================== Similar on address 0x2d302e31312e35c7, looks like uninit. ================================================================== BUG: KASAN: wild-memory-access in atomic_inc include/asm-generic/atomic-instrumented.h:87 [inline] at addr 2d302e31312e35c7 BUG: KASAN: wild-memory-access in __lock_acquire+0x21a/0x3a80 kernel/locking/lockdep.c:3239 at addr 2d302e31312e35c7 Write of size 4 by task syz-executor1/9446 CPU: 1 PID: 9446 Comm: syz-executor1 Not tainted 4.11.0-rc3+ #364 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x1b8/0x28d lib/dump_stack.c:52 kasan_report_error mm/kasan/report.c:291 [inline] kasan_report.part.2+0x34a/0x480 mm/kasan/report.c:316 kasan_report+0x21/0x30 mm/kasan/report.c:303 check_memory_region_inline mm/kasan/kasan.c:326 [inline] check_memory_region+0x137/0x190 mm/kasan/kasan.c:333 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:344 atomic_inc include/asm-generic/atomic-instrumented.h:87 [inline] __lock_acquire+0x21a/0x3a80 kernel/locking/lockdep.c:3239 lock_acquire+0x1ee/0x590 kernel/locking/lockdep.c:3762 __raw_write_lock include/linux/rwlock_api_smp.h:210 [inline] _raw_write_lock+0x33/0x50 kernel/locking/spinlock.c:295 mpol_free_shared_policy+0x43/0xb0 mm/mempolicy.c:2536 hugetlbfs_destroy_inode+0xca/0x120 fs/hugetlbfs/inode.c:952 alloc_inode+0x10d/0x180 fs/inode.c:216 new_inode_pseudo+0x69/0x190 fs/inode.c:889 new_inode+0x1c/0x40 fs/inode.c:918 hugetlbfs_get_inode+0x40/0x420 fs/hugetlbfs/inode.c:734 hugetlb_file_setup+0x329/0x9f0 fs/hugetlbfs/inode.c:1282 newseg+0x422/0xd30 ipc/shm.c:575 ipcget_new ipc/util.c:285 [inline] ipcget+0x21e/0x580 ipc/util.c:639 SYSC_shmget ipc/shm.c:673 [inline] SyS_shmget+0x158/0x230 ipc/shm.c:657 entry_SYSCALL_64_fastpath+0x1f/0xc2 RIP: 0033:0x445b79 RSP: 002b:00007fc865dbe858 EFLAGS: 00000282 ORIG_RAX: 000000000000001d RAX: ffffffffffffffda RBX: 0000000000708000 RCX: 0000000000445b79 RDX: 0000000000000800 RSI: 0000000000003000 RDI: 0000000000000000 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020002000 R11: 0000000000000282 R12: 00000000004a7e31 R13: 0000000000000000 R14: 00007fc865dbe618 R15: 00007fc865dbe788 ================================================================== _______________________________________________ Selinux mailing list Selinux@xxxxxxxxxxxxx To unsubscribe, send email to Selinux-leave@xxxxxxxxxxxxx. 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