================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:72 [inline] BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: null-ptr-deref in page_ref_count include/linux/page_ref.h:67 [inline] BUG: KASAN: null-ptr-deref in folio_ref_count include/linux/page_ref.h:89 [inline] BUG: KASAN: null-ptr-deref in folio_get include/linux/mm.h:1167 [inline] BUG: KASAN: null-ptr-deref in hugetlb_fault+0x1423/0x23f0 mm/hugetlb.c:6112 Read of size 4 at addr 0000000000000034 by task syz-executor.5/11207 CPU: 0 PID: 11207 Comm: syz-executor.5 Not tainted 6.2.0-rc5-next-20230123-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 kasan_report+0xc0/0xf0 mm/kasan/report.c:517 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x141/0x190 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:72 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] page_ref_count include/linux/page_ref.h:67 [inline] folio_ref_count include/linux/page_ref.h:89 [inline] folio_get include/linux/mm.h:1167 [inline] hugetlb_fault+0x1423/0x23f0 mm/hugetlb.c:6112 handle_mm_fault+0x753/0x850 mm/memory.c:5196 do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1407 handle_page_fault arch/x86/mm/fault.c:1498 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1554 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] RIP: 0010:strncpy_from_user+0x1c1/0x3c0 lib/strncpy_from_user.c:139 Code: ed 08 4d 89 74 1d 00 bf 07 00 00 00 48 83 c3 08 48 89 ee e8 91 dc 49 fd 48 83 fd 07 0f 86 c0 01 00 00 e8 b2 df 49 fd 45 31 ff <49> 8b 04 1c 31 ff 44 89 fe 49 89 c6 e8 4e dc 49 fd 45 85 ff 0f 84 RSP: 0018:ffffc9000324fd08 EFLAGS: 00050246 RAX: 000000000000006c RBX: 0000000000000000 RCX: ffffc9000ec3c000 RDX: 0000000000040000 RSI: ffffffff84380e7e RDI: 0000000000000007 RBP: 0000000000000fe0 R08: 0000000000000007 R09: 0000000000000007 R10: 0000000000000fe0 R11: 0000000000000000 R12: 0000000020000380 R13: ffff88808e0d3320 R14: ffff88808e0d3320 R15: 0000000000000000 getname_flags.part.0+0x95/0x4f0 fs/namei.c:151 getname_flags include/linux/audit.h:320 [inline] getname+0x92/0xd0 fs/namei.c:219 do_sys_openat2+0xf5/0x4c0 fs/open.c:1306 do_sys_open fs/open.c:1328 [inline] __do_sys_openat fs/open.c:1344 [inline] __se_sys_openat fs/open.c:1339 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1339 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f9a32a8c0c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9a33831168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f9a32bac120 RCX: 00007f9a32a8c0c9 RDX: 0004000000044882 RSI: 0000000020000380 RDI: ffffffffffffff9c RBP: 00007f9a32ae7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff046f0b6f R14: 00007f9a33831300 R15: 0000000000022000 ================================================================== ---------------- Code disassembly (best guess): 0: ed in (%dx),%eax 1: 08 4d 89 or %cl,-0x77(%rbp) 4: 74 1d je 0x23 6: 00 bf 07 00 00 00 add %bh,0x7(%rdi) c: 48 83 c3 08 add $0x8,%rbx 10: 48 89 ee mov %rbp,%rsi 13: e8 91 dc 49 fd callq 0xfd49dca9 18: 48 83 fd 07 cmp $0x7,%rbp 1c: 0f 86 c0 01 00 00 jbe 0x1e2 22: e8 b2 df 49 fd callq 0xfd49dfd9 27: 45 31 ff xor %r15d,%r15d * 2a: 49 8b 04 1c mov (%r12,%rbx,1),%rax <-- trapping instruction 2e: 31 ff xor %edi,%edi 30: 44 89 fe mov %r15d,%esi 33: 49 89 c6 mov %rax,%r14 36: e8 4e dc 49 fd callq 0xfd49dc89 3b: 45 85 ff test %r15d,%r15d 3e: 0f .byte 0xf 3f: 84 .byte 0x84