================================================================== BUG: KASAN: invalid-access in smk_access+0x54/0x148 security/smack/smack_access.c:147 Read at addr f3f0000009274930 by task syz.0.5959/23657 Pointer tag: [f3], memory tag: [fb] CPU: 1 UID: 0 PID: 23657 Comm: syz.0.5959 Not tainted 6.11.0-syzkaller-07341-gbaeb9a7d8b60 #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:319 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:326 __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x78/0x90 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x108/0x618 mm/kasan/report.c:488 kasan_report+0x88/0xac mm/kasan/report.c:601 report_tag_fault arch/arm64/mm/fault.c:332 [inline] do_tag_recovery arch/arm64/mm/fault.c:344 [inline] __do_kernel_fault+0x170/0x1c8 arch/arm64/mm/fault.c:386 do_bad_area arch/arm64/mm/fault.c:486 [inline] do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:803 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:879 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:432 el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:492 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:593 smk_access+0x54/0x148 security/smack/smack_access.c:147 smack_watch_key+0xe0/0xf8 security/smack/smack_lsm.c:4656 security_watch_key+0x58/0x148 security/security.c:4448 keyctl_watch_key+0xb0/0x1cc security/keys/keyctl.c:1813 __do_sys_keyctl security/keys/keyctl.c:2021 [inline] __se_sys_keyctl security/keys/keyctl.c:1874 [inline] __arm64_sys_keyctl+0x50/0x290 security/keys/keyctl.c:1874 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151 el0_svc+0x34/0xec arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at fff0000009274930 which belongs to the cache kmalloc-16 of size 16 The buggy address is located 0 bytes inside of 16-byte region [fff0000009274930, fff0000009274940) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xf8f0000009274cd0 pfn:0x49274 flags: 0x1ffc00000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) page_type: 0xfdffffff(slab) raw: 01ffc00000000000 f5f0000003001400 dead000000000122 0000000000000000 raw: f8f0000009274cd0 0000000081000087 00000001fdffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: fff0000009274700: fe fe f8 fe f3 fe f5 fb fe fe f2 fe fe fe fe fe fff0000009274800: fe f9 fb fc fe fe fe fe fe fb fe fe f8 fe fe fe >fff0000009274900: f1 f3 fe fb fe fe f4 fe fe fe fe fe fe fe fe fe ^ fff0000009274a00: f6 fe fe fe fe fe fe fd fe fe f3 f3 fe fe fe fe fff0000009274b00: f8 fd fe fe fe fe fd fe fe fe fe fe fe fe f7 fe ================================================================== Unable to handle kernel NULL pointer dereference at virtual address 0000000000000030 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 52-bit VAs, pgdp=00000000464af500 [0000000000000030] pgd=08000000495a2003, p4d=08000000667e7003, pud=080000005ad5f003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 UID: 0 PID: 23657 Comm: syz.0.5959 Tainted: G B 6.11.0-syzkaller-07341-gbaeb9a7d8b60 #0 Tainted: [B]=BAD_PAGE Hardware name: linux,dummy-virt (DT) pstate: 61400009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : __pi_strlen+0x14/0x150 arch/arm64/lib/strlen.S:87 lr : audit_log_untrustedstring+0x20/0x40 kernel/audit.c:2135 sp : ffff80008b823c00 x29: ffff80008b823c00 x28: f1f0000005f4b6c0 x27: 0000000000000000 x26: 0000000000000000 x25: 0000000000000000 x24: f2f0000009031e00 x23: 00000000fffffff3 x22: 0000000000000000 x21: ffff8000805153f8 x20: fdf0000003042560 x19: 0000000000000030 x18: ffffffffffffffff x17: 0000000000000000 x16: 0000000000000000 x15: ffff80008b8239e0 x14: 0000000000000000 x13: f1f0000006b4581f x12: ffff800080027eb8 x11: ffff800080011558 x10: 000000000000005f x9 : 0000000000000276 x8 : 0101010101010101 x7 : 00000000000006c0 x6 : 0000000000000059 x5 : f1f0000006b45859 x4 : 0000000000000000 x3 : 0000000000000061 x2 : 0000000000000000 x1 : 0000000000000030 x0 : 0000000000000030 Call trace: __pi_strlen+0x14/0x150 arch/arm64/lib/strlen.S:86 smack_log_callback+0x7c/0xc8 security/smack/smack_access.c:321 common_lsm_audit+0x5c/0x85c security/lsm_audit.c:456 smack_log+0xec/0x140 security/smack/smack_access.c:383 smk_access+0x104/0x148 security/smack/smack_access.c:199 smack_watch_key+0xe0/0xf8 security/smack/smack_lsm.c:4656 security_watch_key+0x58/0x148 security/security.c:4448 keyctl_watch_key+0xb0/0x1cc security/keys/keyctl.c:1813 __do_sys_keyctl security/keys/keyctl.c:2021 [inline] __se_sys_keyctl security/keys/keyctl.c:1874 [inline] __arm64_sys_keyctl+0x50/0x290 security/keys/keyctl.c:1874 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151 el0_svc+0x34/0xec arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 Code: 92400c04 b200c3e8 f100009f 5400088c (a9400c02) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 92400c04 and x4, x0, #0xf 4: b200c3e8 mov x8, #0x101010101010101 // #72340172838076673 8: f100009f cmp x4, #0x0 c: 5400088c b.gt 0x11c * 10: a9400c02 ldp x2, x3, [x0] <-- trapping instruction