================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline] BUG: KASAN: use-after-free in atomic_long_add_return_acquire include/linux/atomic/atomic-instrumented.h:1309 [inline] BUG: KASAN: use-after-free in rwsem_read_trylock kernel/locking/rwsem.c:243 [inline] BUG: KASAN: use-after-free in __down_read_common kernel/locking/rwsem.c:1259 [inline] BUG: KASAN: use-after-free in __down_read kernel/locking/rwsem.c:1269 [inline] BUG: KASAN: use-after-free in down_read+0xa5/0x450 kernel/locking/rwsem.c:1511 Write of size 8 at addr ffff888145282b08 by task syz-executor225/14126 CPU: 0 PID: 14126 Comm: syz-executor225 Not tainted 6.1.0-rc4-syzkaller-00308-gf5020a08b2b3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:102 [inline] atomic_long_add_return_acquire include/linux/atomic/atomic-instrumented.h:1309 [inline] rwsem_read_trylock kernel/locking/rwsem.c:243 [inline] __down_read_common kernel/locking/rwsem.c:1259 [inline] __down_read kernel/locking/rwsem.c:1269 [inline] down_read+0xa5/0x450 kernel/locking/rwsem.c:1511 hugetlb_vma_lock_read mm/hugetlb.c:6816 [inline] hugetlb_fault+0x40a/0x2060 mm/hugetlb.c:5859 handle_mm_fault+0x640/0x780 mm/memory.c:5216 do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1428 handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x94/0x170 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:copy_user_short_string+0xa/0x40 arch/x86/lib/copy_user_64.S:232 Code: 83 f8 12 74 0a 89 d1 f3 a4 89 c8 0f 01 ca c3 89 d0 0f 01 ca c3 01 ca eb e7 0f 1f 80 00 00 00 00 89 d1 83 e2 07 c1 e9 03 74 12 <4c> 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 RSP: 0018:ffffc9000668fbb8 EFLAGS: 00050202 RAX: 0000000000000001 RBX: 0000000000000010 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffc9000668fda8 RBP: ffffc9000668fda8 R08: 0000000000000001 R09: ffffc9000668fdb7 R10: fffff52000cd1fb6 R11: 0000000000000001 R12: 00007fffffffeff0 R13: 00000000200000c0 R14: 0000000000000010 R15: ffffc9000668fda8 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline] _copy_from_user+0x137/0x170 lib/usercopy.c:16 copy_from_user include/linux/uaccess.h:161 [inline] copy_iovec_from_user lib/iov_iter.c:1720 [inline] iovec_from_user lib/iov_iter.c:1755 [inline] iovec_from_user+0x149/0x3a0 lib/iov_iter.c:1730 __import_iovec+0x65/0x610 lib/iov_iter.c:1773 import_iovec+0x10c/0x150 lib/iov_iter.c:1838 vfs_writev+0xc1/0x630 fs/read_write.c:931 do_writev+0x133/0x2f0 fs/read_write.c:977 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f8e25ce5aa9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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:00007f8e25c76208 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f8e25d6d3f8 RCX: 00007f8e25ce5aa9 RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f8e25d6d3f0 R08: 00007f8e25d6d3f0 R09: 0000000000000000 R10: 00007f8e25c76210 R11: 0000000000000246 R12: 00007f8e25d6d3fc R13: 00007ffc28a02c1f R14: 00007f8e25c76300 R15: 0000000000022000 Allocated by task 14125: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:553 [inline] hugetlb_vma_lock_alloc.part.0+0x3f/0x130 mm/hugetlb.c:6926 hugetlb_vma_lock_alloc mm/hugetlb.c:6682 [inline] hugetlb_reserve_pages+0xa3f/0xe80 mm/hugetlb.c:6551 hugetlbfs_file_mmap+0x40c/0x5c0 fs/hugetlbfs/inode.c:167 call_mmap include/linux/fs.h:2196 [inline] mmap_region+0x6bf/0x1c00 mm/mmap.c:2625 do_mmap+0x825/0xf50 mm/mmap.c:1412 vm_mmap_pgoff+0x1ab/0x270 mm/util.c:520 ksys_mmap_pgoff+0x1c3/0x5a0 mm/mmap.c:1458 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 14125: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3674 hugetlb_vma_lock_release mm/hugetlb.c:6871 [inline] kref_put include/linux/kref.h:65 [inline] __hugetlb_vma_unlock_write_put mm/hugetlb.c:6886 [inline] __hugetlb_vma_unlock_write_free mm/hugetlb.c:6894 [inline] __unmap_hugepage_range_final+0x2ad/0x340 mm/hugetlb.c:5215 unmap_single_vma+0x23d/0x2a0 mm/memory.c:1690 zap_page_range+0x38a/0x520 mm/memory.c:1762 madvise_dontneed_single_vma mm/madvise.c:793 [inline] madvise_dontneed_free mm/madvise.c:886 [inline] madvise_vma_behavior+0x11ca/0x1e60 mm/madvise.c:1025 madvise_walk_vmas+0x1c7/0x2b0 mm/madvise.c:1250 do_madvise.part.0+0x24a/0x340 mm/madvise.c:1429 do_madvise mm/madvise.c:1442 [inline] __do_sys_madvise mm/madvise.c:1442 [inline] __se_sys_madvise mm/madvise.c:1440 [inline] __x64_sys_madvise+0x113/0x150 mm/madvise.c:1440 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888145282b00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 8 bytes inside of 192-byte region [ffff888145282b00, ffff888145282bc0) The buggy address belongs to the physical page: page:ffffea000514a080 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x145282 flags: 0x57ff00000000200(slab|node=1|zone=2|lastcpupid=0x7ff) raw: 057ff00000000200 dead000000000100 dead000000000122 ffff888011841a00 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 1956926677, free_ts 0 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4288 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5555 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2118 alloc_pages+0x22f/0x270 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1794 [inline] allocate_slab+0x213/0x300 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3180 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279 slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x191/0x3e0 mm/slub.c:3437 kmalloc_trace+0x22/0x60 mm/slab_common.c:1045 kmalloc include/linux/slab.h:553 [inline] kzalloc include/linux/slab.h:689 [inline] call_usermodehelper_setup+0x97/0x340 kernel/umh.c:366 kobject_uevent_env+0xecf/0x1620 lib/kobject_uevent.c:614 kernel_add_sysfs_param kernel/params.c:816 [inline] param_sysfs_builtin kernel/params.c:851 [inline] param_sysfs_init+0x367/0x43b kernel/params.c:970 do_one_initcall+0x13d/0x780 init/main.c:1303 do_initcall_level init/main.c:1376 [inline] do_initcalls init/main.c:1392 [inline] do_basic_setup init/main.c:1411 [inline] kernel_init_freeable+0x6ff/0x788 init/main.c:1631 kernel_init+0x1a/0x1d0 init/main.c:1519 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 page_owner free stack trace missing Memory state around the buggy address: ffff888145282a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888145282a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888145282b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888145282b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888145282c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 83 f8 12 cmp $0x12,%eax 3: 74 0a je 0xf 5: 89 d1 mov %edx,%ecx 7: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) 9: 89 c8 mov %ecx,%eax b: 0f 01 ca clac e: c3 retq f: 89 d0 mov %edx,%eax 11: 0f 01 ca clac 14: c3 retq 15: 01 ca add %ecx,%edx 17: eb e7 jmp 0x0 19: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 20: 89 d1 mov %edx,%ecx 22: 83 e2 07 and $0x7,%edx 25: c1 e9 03 shr $0x3,%ecx 28: 74 12 je 0x3c * 2a: 4c 8b 06 mov (%rsi),%r8 <-- trapping instruction 2d: 4c 89 07 mov %r8,(%rdi) 30: 48 8d 76 08 lea 0x8(%rsi),%rsi 34: 48 8d 7f 08 lea 0x8(%rdi),%rdi 38: ff c9 dec %ecx 3a: 75 ee jne 0x2a 3c: 21 d2 and %edx,%edx 3e: 74 10 je 0x50