random: sshd: uninitialized urandom read (32 bytes read) 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 ffff8801d4355c34 by task syz-executor895/4511 CPU: 0 PID: 4511 Comm: syz-executor895 Not tainted 4.18.0-rc3+ #137 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 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440309 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc5c160458 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 6761746568636163 RCX: 0000000000440309 RDX: 00000000200002c0 RSI: 0000000020000280 RDI: 0000000000000000 RBP: 00000000006ca018 R08: 0000000020000340 R09: 00000000004002c8 R10: 0000000000800000 R11: 0000000000000202 R12: 0000000000401b90 R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4511: 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 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe 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_sha256_avx2 arch/x86/crypto/sha256_ssse3_glue.c:297 [inline] sha256_ssse3_mod_init+0x1c3/0x3ea arch/x86/crypto/sha256_ssse3_glue.c:397 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 ffff8801d4355c00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 52 bytes inside of 64-byte region [ffff8801d4355c00, ffff8801d4355c40) The buggy address belongs to the page: page:ffffea000750d540 count:1 mapcount:0 mapping:ffff8801da800340 index:0xffff8801d4355080 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00075988c8 ffffea0007511b88 ffff8801da800340 raw: ffff8801d4355080 ffff8801d4355000 000000010000000d 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d4355b00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801d4355b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8801d4355c00: 00 00 00 00 00 00 07 fc fc fc fc fc fc fc fc fc ^ ffff8801d4355c80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff8801d4355d00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================