================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_to_iter lib/iov_iter.c:65 [inline] BUG: KASAN: slab-out-of-bounds in iterate_bvec include/linux/iov_iter.h:122 [inline] BUG: KASAN: slab-out-of-bounds in iterate_and_advance2 include/linux/iov_iter.h:249 [inline] BUG: KASAN: slab-out-of-bounds in iterate_and_advance include/linux/iov_iter.h:271 [inline] BUG: KASAN: slab-out-of-bounds in _copy_to_iter+0x7d4/0x1cf0 lib/iov_iter.c:185 Write of size 2048 at addr ffff888028fa6000 by task kworker/u8:2/28 CPU: 0 PID: 28 Comm: kworker/u8:2 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Workqueue: loop0 loop_rootcg_workfn Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 memcpy_to_iter lib/iov_iter.c:65 [inline] iterate_bvec include/linux/iov_iter.h:122 [inline] iterate_and_advance2 include/linux/iov_iter.h:249 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] _copy_to_iter+0x7d4/0x1cf0 lib/iov_iter.c:185 copy_page_to_iter+0xb1/0x160 lib/iov_iter.c:362 shmem_file_read_iter+0x4cb/0xa50 mm/shmem.c:2872 do_iter_readv_writev+0x5a4/0x800 vfs_iter_read+0x152/0x420 fs/read_write.c:830 lo_read_simple drivers/block/loop.c:286 [inline] do_req_filebacked drivers/block/loop.c:496 [inline] loop_handle_cmd drivers/block/loop.c:1907 [inline] loop_process_work+0xcfb/0x1e60 drivers/block/loop.c:1942 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 5086: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3966 [inline] __kmalloc+0x233/0x4a0 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] hfsplus_read_wrapper+0x613/0x1340 fs/hfsplus/wrapper.c:182 hfsplus_fill_super+0x38e/0x1ca0 fs/hfsplus/super.c:419 mount_bdev+0x20a/0x2d0 fs/super.c:1658 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1779 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff888028fa6000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of allocated 512-byte region [ffff888028fa6000, ffff888028fa6200) The buggy address belongs to the physical page: page:ffffea0000a3e900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28fa4 head:ffffea0000a3e900 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888014c41c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 25780901845, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x256/0x680 mm/page_alloc.c:4569 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2175 allocate_slab mm/slub.c:2338 [inline] new_slab+0x84/0x2f0 mm/slub.c:2391 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] __do_kmalloc_node mm/slub.c:3965 [inline] __kmalloc+0x2e5/0x4a0 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] pkcs1pad_verify+0x10b/0x600 crypto/rsa-pkcs1pad.c:564 crypto_akcipher_verify include/crypto/akcipher.h:455 [inline] crypto_sig_verify+0x211/0x2b0 crypto/sig.c:129 public_key_verify_signature+0x573/0x790 crypto/asymmetric_keys/public_key.c:441 x509_check_for_self_signed+0x324/0x420 crypto/asymmetric_keys/x509_public_key.c:138 x509_cert_parse+0x5b9/0x7c0 crypto/asymmetric_keys/x509_cert_parser.c:133 x509_key_preparse+0x65/0x680 crypto/asymmetric_keys/x509_public_key.c:171 asymmetric_key_preparse+0xb5/0x160 crypto/asymmetric_keys/asymmetric_type.c:417 __key_create_or_update+0x481/0xc70 security/keys/key.c:841 key_create_or_update+0x42/0x60 security/keys/key.c:1005 page_owner free stack trace missing Memory state around the buggy address: ffff888028fa6100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888028fa6180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888028fa6200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888028fa6280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888028fa6300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================