On Wed, 2024-10-02 at 00:26 -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: ad46e8f95e93 Merge tag 'pm-6.12-rc1-2' of git://git.kernel.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1177d507980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=85d8f50d88ddf2a > dashboard link: https://syzkaller.appspot.com/bug?extid=91ae49e1c1a2634d20c0 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=106026a9980000 At a first look, it seems that IMA is measuring an uninitialized buffer from exfat. Uninit was created at: __alloc_pages_noprof+0x9d6/0xe70 mm/page_alloc.c:4756 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265 alloc_pages_noprof mm/mempolicy.c:2345 [inline] folio_alloc_noprof+0x1db/0x310 mm/mempolicy.c:2352 filemap_alloc_folio_noprof+0xa6/0x440 mm/filemap.c:1010 __filemap_get_folio+0xac4/0x1550 mm/filemap.c:1952 block_write_begin+0x6e/0x2b0 fs/buffer.c:2226 I saw there are some relevant commits in this area from the latest PRs. Matthew, Yuezhang, could you please have a look? Thanks! Roberto > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/265feec46ffa/disk-ad46e8f9.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/d0f41ea693d3/vmlinux-ad46e8f9.xz > kernel image: https://storage.googleapis.com/syzbot-assets/45082d33d192/bzImage-ad46e8f9.xz > mounted in repro: https://storage.googleapis.com/syzbot-assets/5b5b4e4b4ff9/mount_0.gz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+91ae49e1c1a2634d20c0@xxxxxxxxxxxxxxxxxxxxxxxxx > > ===================================================== > BUG: KMSAN: uninit-value in ima_add_template_entry+0x52b/0x880 security/integrity/ima/ima_queue.c:172 > ima_add_template_entry+0x52b/0x880 security/integrity/ima/ima_queue.c:172 > ima_store_template security/integrity/ima/ima_api.c:122 [inline] > ima_store_measurement+0x36b/0x8d0 security/integrity/ima/ima_api.c:383 > process_measurement+0x2c11/0x3f30 security/integrity/ima/ima_main.c:380 > ima_file_check+0xb4/0x100 security/integrity/ima/ima_main.c:572 > security_file_post_open+0xc6/0x540 security/security.c:3127 > do_open fs/namei.c:3776 [inline] > path_openat+0x58cc/0x6200 fs/namei.c:3933 > do_filp_open+0x20e/0x590 fs/namei.c:3960 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1415 > do_sys_open fs/open.c:1430 [inline] > __do_sys_open fs/open.c:1438 [inline] > __se_sys_open fs/open.c:1434 [inline] > __x64_sys_open+0x275/0x2d0 fs/open.c:1434 > x64_sys_call+0x15a2/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:3 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > <Zero or more stacks not recorded to save memory> > > Uninit was stored to memory at: > sha256_transform lib/crypto/sha256.c:117 [inline] > sha256_transform_blocks+0x2dbf/0x2e90 lib/crypto/sha256.c:127 > lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline] > sha256_update+0x2ff/0x340 lib/crypto/sha256.c:136 > crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39 > crypto_shash_update+0x79/0xa0 crypto/shash.c:52 > ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:491 [inline] > ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] > ima_calc_file_hash+0x1804/0x3c90 security/integrity/ima/ima_crypto.c:568 > ima_collect_measurement+0x464/0xd20 security/integrity/ima/ima_api.c:293 > process_measurement+0x2948/0x3f30 security/integrity/ima/ima_main.c:372 > ima_file_check+0xb4/0x100 security/integrity/ima/ima_main.c:572 > security_file_post_open+0xc6/0x540 security/security.c:3127 > do_open fs/namei.c:3776 [inline] > path_openat+0x58cc/0x6200 fs/namei.c:3933 > do_filp_open+0x20e/0x590 fs/namei.c:3960 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1415 > do_sys_open fs/open.c:1430 [inline] > __do_sys_open fs/open.c:1438 [inline] > __se_sys_open fs/open.c:1434 [inline] > __x64_sys_open+0x275/0x2d0 fs/open.c:1434 > x64_sys_call+0x15a2/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:3 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was stored to memory at: > sha256_transform lib/crypto/sha256.c:117 [inline] > sha256_transform_blocks+0x2dbf/0x2e90 lib/crypto/sha256.c:127 > lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline] > sha256_update+0x2ff/0x340 lib/crypto/sha256.c:136 > crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39 > crypto_shash_update+0x79/0xa0 crypto/shash.c:52 > ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:491 [inline] > ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] > ima_calc_file_hash+0x1804/0x3c90 security/integrity/ima/ima_crypto.c:568 > ima_collect_measurement+0x464/0xd20 security/integrity/ima/ima_api.c:293 > process_measurement+0x2948/0x3f30 security/integrity/ima/ima_main.c:372 > ima_file_check+0xb4/0x100 security/integrity/ima/ima_main.c:572 > security_file_post_open+0xc6/0x540 security/security.c:3127 > do_open fs/namei.c:3776 [inline] > path_openat+0x58cc/0x6200 fs/namei.c:3933 > do_filp_open+0x20e/0x590 fs/namei.c:3960 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1415 > do_sys_open fs/open.c:1430 [inline] > __do_sys_open fs/open.c:1438 [inline] > __se_sys_open fs/open.c:1434 [inline] > __x64_sys_open+0x275/0x2d0 fs/open.c:1434 > x64_sys_call+0x15a2/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:3 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was stored to memory at: > BLEND_OP lib/crypto/sha256.c:61 [inline] > sha256_transform lib/crypto/sha256.c:91 [inline] > sha256_transform_blocks+0xf33/0x2e90 lib/crypto/sha256.c:127 > lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline] > sha256_update+0x2ff/0x340 lib/crypto/sha256.c:136 > crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39 > crypto_shash_update+0x79/0xa0 crypto/shash.c:52 > ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:491 [inline] > ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] > ima_calc_file_hash+0x1804/0x3c90 security/integrity/ima/ima_crypto.c:568 > ima_collect_measurement+0x464/0xd20 security/integrity/ima/ima_api.c:293 > process_measurement+0x2948/0x3f30 security/integrity/ima/ima_main.c:372 > ima_file_check+0xb4/0x100 security/integrity/ima/ima_main.c:572 > security_file_post_open+0xc6/0x540 security/security.c:3127 > do_open fs/namei.c:3776 [inline] > path_openat+0x58cc/0x6200 fs/namei.c:3933 > do_filp_open+0x20e/0x590 fs/namei.c:3960 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1415 > do_sys_open fs/open.c:1430 [inline] > __do_sys_open fs/open.c:1438 [inline] > __se_sys_open fs/open.c:1434 [inline] > __x64_sys_open+0x275/0x2d0 fs/open.c:1434 > x64_sys_call+0x15a2/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:3 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was stored to memory at: > BLEND_OP lib/crypto/sha256.c:61 [inline] > sha256_transform lib/crypto/sha256.c:92 [inline] > sha256_transform_blocks+0xf7d/0x2e90 lib/crypto/sha256.c:127 > lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline] > sha256_update+0x2ff/0x340 lib/crypto/sha256.c:136 > crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39 > crypto_shash_update+0x79/0xa0 crypto/shash.c:52 > ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:491 [inline] > ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] > ima_calc_file_hash+0x1804/0x3c90 security/integrity/ima/ima_crypto.c:568 > ima_collect_measurement+0x464/0xd20 security/integrity/ima/ima_api.c:293 > process_measurement+0x2948/0x3f30 security/integrity/ima/ima_main.c:372 > ima_file_check+0xb4/0x100 security/integrity/ima/ima_main.c:572 > security_file_post_open+0xc6/0x540 security/security.c:3127 > do_open fs/namei.c:3776 [inline] > path_openat+0x58cc/0x6200 fs/namei.c:3933 > do_filp_open+0x20e/0x590 fs/namei.c:3960 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1415 > do_sys_open fs/open.c:1430 [inline] > __do_sys_open fs/open.c:1438 [inline] > __se_sys_open fs/open.c:1434 [inline] > __x64_sys_open+0x275/0x2d0 fs/open.c:1434 > x64_sys_call+0x15a2/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:3 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was stored to memory at: > BLEND_OP lib/crypto/sha256.c:61 [inline] > sha256_transform lib/crypto/sha256.c:93 [inline] > sha256_transform_blocks+0xfb5/0x2e90 lib/crypto/sha256.c:127 > lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline] > sha256_update+0x2ff/0x340 lib/crypto/sha256.c:136 > crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39 > crypto_shash_update+0x79/0xa0 crypto/shash.c:52 > ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:491 [inline] > ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] > ima_calc_file_hash+0x1804/0x3c90 security/integrity/ima/ima_crypto.c:568 > ima_collect_measurement+0x464/0xd20 security/integrity/ima/ima_api.c:293 > process_measurement+0x2948/0x3f30 security/integrity/ima/ima_main.c:372 > ima_file_check+0xb4/0x100 security/integrity/ima/ima_main.c:572 > security_file_post_open+0xc6/0x540 security/security.c:3127 > do_open fs/namei.c:3776 [inline] > path_openat+0x58cc/0x6200 fs/namei.c:3933 > do_filp_open+0x20e/0x590 fs/namei.c:3960 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1415 > do_sys_open fs/open.c:1430 [inline] > __do_sys_open fs/open.c:1438 [inline] > __se_sys_open fs/open.c:1434 [inline] > __x64_sys_open+0x275/0x2d0 fs/open.c:1434 > x64_sys_call+0x15a2/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:3 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was stored to memory at: > LOAD_OP lib/crypto/sha256.c:56 [inline] > sha256_transform lib/crypto/sha256.c:82 [inline] > sha256_transform_blocks+0x2c35/0x2e90 lib/crypto/sha256.c:127 > lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline] > sha256_update+0x2ff/0x340 lib/crypto/sha256.c:136 > crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39 > crypto_shash_update+0x79/0xa0 crypto/shash.c:52 > ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:491 [inline] > ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] > ima_calc_file_hash+0x1804/0x3c90 security/integrity/ima/ima_crypto.c:568 > ima_collect_measurement+0x464/0xd20 security/integrity/ima/ima_api.c:293 > process_measurement+0x2948/0x3f30 security/integrity/ima/ima_main.c:372 > ima_file_check+0xb4/0x100 security/integrity/ima/ima_main.c:572 > security_file_post_open+0xc6/0x540 security/security.c:3127 > do_open fs/namei.c:3776 [inline] > path_openat+0x58cc/0x6200 fs/namei.c:3933 > do_filp_open+0x20e/0x590 fs/namei.c:3960 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1415 > do_sys_open fs/open.c:1430 [inline] > __do_sys_open fs/open.c:1438 [inline] > __se_sys_open fs/open.c:1434 [inline] > __x64_sys_open+0x275/0x2d0 fs/open.c:1434 > x64_sys_call+0x15a2/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:3 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was stored to memory at: > memcpy_to_iter lib/iov_iter.c:65 [inline] > iterate_kvec include/linux/iov_iter.h:86 [inline] > iterate_and_advance2 include/linux/iov_iter.h:306 [inline] > iterate_and_advance include/linux/iov_iter.h:328 [inline] > _copy_to_iter+0x124a/0x2b30 lib/iov_iter.c:185 > copy_page_to_iter+0x419/0x880 lib/iov_iter.c:362 > copy_folio_to_iter include/linux/uio.h:189 [inline] > filemap_read+0xc13/0x1500 mm/filemap.c:2696 > generic_file_read_iter+0x136/0xad0 mm/filemap.c:2833 > __kernel_read+0x726/0xd30 fs/read_write.c:527 > integrity_kernel_read+0x77/0x90 security/integrity/iint.c:28 > ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:480 [inline] > ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] > ima_calc_file_hash+0x1731/0x3c90 security/integrity/ima/ima_crypto.c:568 > ima_collect_measurement+0x464/0xd20 security/integrity/ima/ima_api.c:293 > process_measurement+0x2948/0x3f30 security/integrity/ima/ima_main.c:372 > ima_file_check+0xb4/0x100 security/integrity/ima/ima_main.c:572 > security_file_post_open+0xc6/0x540 security/security.c:3127 > do_open fs/namei.c:3776 [inline] > path_openat+0x58cc/0x6200 fs/namei.c:3933 > do_filp_open+0x20e/0x590 fs/namei.c:3960 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1415 > do_sys_open fs/open.c:1430 [inline] > __do_sys_open fs/open.c:1438 [inline] > __se_sys_open fs/open.c:1434 [inline] > __x64_sys_open+0x275/0x2d0 fs/open.c:1434 > x64_sys_call+0x15a2/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:3 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was created at: > __alloc_pages_noprof+0x9d6/0xe70 mm/page_alloc.c:4756 > alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265 > alloc_pages_noprof mm/mempolicy.c:2345 [inline] > folio_alloc_noprof+0x1db/0x310 mm/mempolicy.c:2352 > filemap_alloc_folio_noprof+0xa6/0x440 mm/filemap.c:1010 > __filemap_get_folio+0xac4/0x1550 mm/filemap.c:1952 > block_write_begin+0x6e/0x2b0 fs/buffer.c:2226 > exfat_write_begin+0xfb/0x400 fs/exfat/inode.c:434 > exfat_extend_valid_size fs/exfat/file.c:553 [inline] > exfat_file_write_iter+0x474/0xfb0 fs/exfat/file.c:588 > new_sync_write fs/read_write.c:590 [inline] > vfs_write+0xb28/0x1540 fs/read_write.c:683 > ksys_write+0x24f/0x4c0 fs/read_write.c:736 > __do_sys_write fs/read_write.c:748 [inline] > __se_sys_write fs/read_write.c:745 [inline] > __x64_sys_write+0x93/0xe0 fs/read_write.c:745 > x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > CPU: 1 UID: 0 PID: 7910 Comm: syz.2.975 Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 > ===================================================== > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup
