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Message-ID: <rbab6axciiuomrann3uwvpks2zogx3xfntk7w4p2betq3morlf@5xnl5guhnaxj> Date: Thu, 15 May 2025 10:18:40 -0400 From: Kent Overstreet <kent.overstreet@...ux.dev> To: Roberto Sassu <roberto.sassu@...weicloud.com> Cc: syzbot <syzbot+3f0b3970f154dfc95e6e@...kaller.appspotmail.com>, dmitry.kasatkin@...il.com, eric.snowberg@...cle.com, jmorris@...ei.org, linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org, paul@...l-moore.com, roberto.sassu@...wei.com, serge@...lyn.com, syzkaller-bugs@...glegroups.com, zohar@...ux.ibm.com, linux-bcachefs@...r.kernel.org Subject: Re: [syzbot] [lsm?] [integrity?] KMSAN: uninit-value in ima_add_template_entry (3) On Thu, May 15, 2025 at 04:06:02PM +0200, Roberto Sassu wrote: > On Wed, 2025-05-14 at 07:54 -0700, syzbot wrote: > > Hello, > > + Kent, bcachefs mailing list > > I have the feeling that this was recently fixed in one of the latest > pull requests in bcachefs. I don't see it occurring anymore, and there > are more commits after the one reported by syzbot. I have no idea how any of the ima stuff works or even what it does, I'm not even sure where I'd start... > > Roberto > > > syzbot found the following issue on: > > > > HEAD commit: 02ddfb981de8 Merge tag 'scsi-fixes' of git://git.kernel.or.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=11169670580000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=9dc42c34a3f5c357 > > dashboard link: https://syzkaller.appspot.com/bug?extid=3f0b3970f154dfc95e6e > > compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1574d768580000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/5ca57f5a3f77/disk-02ddfb98.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/3f23cbc11e68/vmlinux-02ddfb98.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/73e63afac354/bzImage-02ddfb98.xz > > mounted in repro: https://storage.googleapis.com/syzbot-assets/0afd18737aed/mount_2.gz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+3f0b3970f154dfc95e6e@...kaller.appspotmail.com > > > > bcachefs (loop2): going read-write > > bcachefs (loop2): done starting filesystem > > ===================================================== > > BUG: KMSAN: uninit-value in ima_lookup_digest_entry security/integrity/ima/ima_queue.c:64 [inline] > > BUG: KMSAN: uninit-value in ima_add_template_entry+0x7a5/0x8d0 security/integrity/ima/ima_queue.c:191 > > ima_lookup_digest_entry security/integrity/ima/ima_queue.c:64 [inline] > > ima_add_template_entry+0x7a5/0x8d0 security/integrity/ima/ima_queue.c:191 > > ima_store_template security/integrity/ima/ima_api.c:122 [inline] > > ima_store_measurement+0x388/0x970 security/integrity/ima/ima_api.c:383 > > process_measurement+0x3075/0x40e0 security/integrity/ima/ima_main.c:393 > > ima_file_check+0x8e/0xd0 security/integrity/ima/ima_main.c:613 > > security_file_post_open+0xbf/0x530 security/security.c:3130 > > do_open fs/namei.c:3882 [inline] > > path_openat+0x5ac3/0x6760 fs/namei.c:4039 > > do_filp_open+0x280/0x660 fs/namei.c:4066 > > do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429 > > do_sys_open fs/open.c:1444 [inline] > > __do_sys_openat fs/open.c:1460 [inline] > > __se_sys_openat fs/open.c:1455 [inline] > > __x64_sys_openat+0x240/0x300 fs/open.c:1455 > > x64_sys_call+0x213/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:258 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 > > 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+0x276d/0x2880 lib/crypto/sha256.c:127 > > lib_sha256_base_do_finalize include/crypto/sha256_base.h:101 [inline] > > __sha256_final lib/crypto/sha256.c:142 [inline] > > sha256_final+0x169/0x460 lib/crypto/sha256.c:148 > > crypto_sha256_final+0xca/0x120 crypto/sha256_generic.c:49 > > crypto_shash_final+0x72/0xa0 crypto/shash.c:58 > > ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:498 [inline] > > ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] > > ima_calc_file_hash+0x240a/0x3fd0 security/integrity/ima/ima_crypto.c:568 > > ima_collect_measurement+0x45d/0xe60 security/integrity/ima/ima_api.c:293 > > process_measurement+0x2d1a/0x40e0 security/integrity/ima/ima_main.c:385 > > ima_file_check+0x8e/0xd0 security/integrity/ima/ima_main.c:613 > > security_file_post_open+0xbf/0x530 security/security.c:3130 > > do_open fs/namei.c:3882 [inline] > > path_openat+0x5ac3/0x6760 fs/namei.c:4039 > > do_filp_open+0x280/0x660 fs/namei.c:4066 > > do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429 > > do_sys_open fs/open.c:1444 [inline] > > __do_sys_openat fs/open.c:1460 [inline] > > __se_sys_openat fs/open.c:1455 [inline] > > __x64_sys_openat+0x240/0x300 fs/open.c:1455 > > x64_sys_call+0x213/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:258 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > > Uninit was stored to memory at: > > sha256_transform lib/crypto/sha256.c:117 [inline] > > sha256_transform_blocks+0x276d/0x2880 lib/crypto/sha256.c:127 > > lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline] > > sha256_update+0x392/0x410 lib/crypto/sha256.c:136 > > crypto_sha256_update+0x35/0x60 crypto/sha256_generic.c:39 > > crypto_shash_update+0x7a/0xb0 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+0x20d7/0x3fd0 security/integrity/ima/ima_crypto.c:568 > > ima_collect_measurement+0x45d/0xe60 security/integrity/ima/ima_api.c:293 > > process_measurement+0x2d1a/0x40e0 security/integrity/ima/ima_main.c:385 > > ima_file_check+0x8e/0xd0 security/integrity/ima/ima_main.c:613 > > security_file_post_open+0xbf/0x530 security/security.c:3130 > > do_open fs/namei.c:3882 [inline] > > path_openat+0x5ac3/0x6760 fs/namei.c:4039 > > do_filp_open+0x280/0x660 fs/namei.c:4066 > > do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429 > > do_sys_open fs/open.c:1444 [inline] > > __do_sys_openat fs/open.c:1460 [inline] > > __se_sys_openat fs/open.c:1455 [inline] > > __x64_sys_openat+0x240/0x300 fs/open.c:1455 > > x64_sys_call+0x213/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:258 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 > > 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+0xded/0x2880 lib/crypto/sha256.c:127 > > lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline] > > sha256_update+0x392/0x410 lib/crypto/sha256.c:136 > > crypto_sha256_update+0x35/0x60 crypto/sha256_generic.c:39 > > crypto_shash_update+0x7a/0xb0 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+0x20d7/0x3fd0 security/integrity/ima/ima_crypto.c:568 > > ima_collect_measurement+0x45d/0xe60 security/integrity/ima/ima_api.c:293 > > process_measurement+0x2d1a/0x40e0 security/integrity/ima/ima_main.c:385 > > ima_file_check+0x8e/0xd0 security/integrity/ima/ima_main.c:613 > > security_file_post_open+0xbf/0x530 security/security.c:3130 > > do_open fs/namei.c:3882 [inline] > > path_openat+0x5ac3/0x6760 fs/namei.c:4039 > > do_filp_open+0x280/0x660 fs/namei.c:4066 > > do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429 > > do_sys_open fs/open.c:1444 [inline] > > __do_sys_openat fs/open.c:1460 [inline] > > __se_sys_openat fs/open.c:1455 [inline] > > __x64_sys_openat+0x240/0x300 fs/open.c:1455 > > x64_sys_call+0x213/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:258 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 > > 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+0xe00/0x2880 lib/crypto/sha256.c:127 > > lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline] > > sha256_update+0x392/0x410 lib/crypto/sha256.c:136 > > crypto_sha256_update+0x35/0x60 crypto/sha256_generic.c:39 > > crypto_shash_update+0x7a/0xb0 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+0x20d7/0x3fd0 security/integrity/ima/ima_crypto.c:568 > > ima_collect_measurement+0x45d/0xe60 security/integrity/ima/ima_api.c:293 > > process_measurement+0x2d1a/0x40e0 security/integrity/ima/ima_main.c:385 > > ima_file_check+0x8e/0xd0 security/integrity/ima/ima_main.c:613 > > security_file_post_open+0xbf/0x530 security/security.c:3130 > > do_open fs/namei.c:3882 [inline] > > path_openat+0x5ac3/0x6760 fs/namei.c:4039 > > do_filp_open+0x280/0x660 fs/namei.c:4066 > > do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429 > > do_sys_open fs/open.c:1444 [inline] > > __do_sys_openat fs/open.c:1460 [inline] > > __se_sys_openat fs/open.c:1455 [inline] > > __x64_sys_openat+0x240/0x300 fs/open.c:1455 > > x64_sys_call+0x213/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:258 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 > > 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+0xe15/0x2880 lib/crypto/sha256.c:127 > > lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline] > > sha256_update+0x392/0x410 lib/crypto/sha256.c:136 > > crypto_sha256_update+0x35/0x60 crypto/sha256_generic.c:39 > > crypto_shash_update+0x7a/0xb0 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+0x20d7/0x3fd0 security/integrity/ima/ima_crypto.c:568 > > ima_collect_measurement+0x45d/0xe60 security/integrity/ima/ima_api.c:293 > > process_measurement+0x2d1a/0x40e0 security/integrity/ima/ima_main.c:385 > > ima_file_check+0x8e/0xd0 security/integrity/ima/ima_main.c:613 > > security_file_post_open+0xbf/0x530 security/security.c:3130 > > do_open fs/namei.c:3882 [inline] > > path_openat+0x5ac3/0x6760 fs/namei.c:4039 > > do_filp_open+0x280/0x660 fs/namei.c:4066 > > do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429 > > do_sys_open fs/open.c:1444 [inline] > > __do_sys_openat fs/open.c:1460 [inline] > > __se_sys_openat fs/open.c:1455 [inline] > > __x64_sys_openat+0x240/0x300 fs/open.c:1455 > > x64_sys_call+0x213/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:258 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 > > 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+0x268b/0x2880 lib/crypto/sha256.c:127 > > lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline] > > sha256_update+0x392/0x410 lib/crypto/sha256.c:136 > > crypto_sha256_update+0x35/0x60 crypto/sha256_generic.c:39 > > crypto_shash_update+0x7a/0xb0 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+0x20d7/0x3fd0 security/integrity/ima/ima_crypto.c:568 > > ima_collect_measurement+0x45d/0xe60 security/integrity/ima/ima_api.c:293 > > process_measurement+0x2d1a/0x40e0 security/integrity/ima/ima_main.c:385 > > ima_file_check+0x8e/0xd0 security/integrity/ima/ima_main.c:613 > > security_file_post_open+0xbf/0x530 security/security.c:3130 > > do_open fs/namei.c:3882 [inline] > > path_openat+0x5ac3/0x6760 fs/namei.c:4039 > > do_filp_open+0x280/0x660 fs/namei.c:4066 > > do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429 > > do_sys_open fs/open.c:1444 [inline] > > __do_sys_openat fs/open.c:1460 [inline] > > __se_sys_openat fs/open.c:1455 [inline] > > __x64_sys_openat+0x240/0x300 fs/open.c:1455 > > x64_sys_call+0x213/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:258 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 > > 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+0x176c/0x32f0 lib/iov_iter.c:185 > > copy_page_to_iter+0x43c/0x8b0 lib/iov_iter.c:362 > > copy_folio_to_iter include/linux/uio.h:198 [inline] > > filemap_read+0xced/0x2190 mm/filemap.c:2753 > > bch2_read_iter+0x559/0x21c0 fs/bcachefs/fs-io-direct.c:221 > > __kernel_read+0x750/0xda0 fs/read_write.c:528 > > 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+0x1ff9/0x3fd0 security/integrity/ima/ima_crypto.c:568 > > ima_collect_measurement+0x45d/0xe60 security/integrity/ima/ima_api.c:293 > > process_measurement+0x2d1a/0x40e0 security/integrity/ima/ima_main.c:385 > > ima_file_check+0x8e/0xd0 security/integrity/ima/ima_main.c:613 > > security_file_post_open+0xbf/0x530 security/security.c:3130 > > do_open fs/namei.c:3882 [inline] > > path_openat+0x5ac3/0x6760 fs/namei.c:4039 > > do_filp_open+0x280/0x660 fs/namei.c:4066 > > do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429 > > do_sys_open fs/open.c:1444 [inline] > > __do_sys_openat fs/open.c:1460 [inline] > > __se_sys_openat fs/open.c:1455 [inline] > > __x64_sys_openat+0x240/0x300 fs/open.c:1455 > > x64_sys_call+0x213/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:258 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > > Uninit was created at: > > __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:4993 > > alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2301 > > alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline] > > alloc_pages_noprof mm/mempolicy.c:2392 [inline] > > folio_alloc_noprof+0x109/0x360 mm/mempolicy.c:2402 > > filemap_alloc_folio_noprof+0x9d/0x420 mm/filemap.c:1007 > > ractl_alloc_folio mm/readahead.c:186 [inline] > > ra_alloc_folio mm/readahead.c:441 [inline] > > page_cache_ra_order+0x93f/0x14f0 mm/readahead.c:509 > > page_cache_sync_ra+0x108a/0x13e0 mm/readahead.c:621 > > filemap_get_pages+0xfb3/0x3a70 mm/filemap.c:2591 > > filemap_read+0x5c6/0x2190 mm/filemap.c:2702 > > bch2_read_iter+0x559/0x21c0 fs/bcachefs/fs-io-direct.c:221 > > __kernel_read+0x750/0xda0 fs/read_write.c:528 > > 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+0x1ff9/0x3fd0 security/integrity/ima/ima_crypto.c:568 > > ima_collect_measurement+0x45d/0xe60 security/integrity/ima/ima_api.c:293 > > process_measurement+0x2d1a/0x40e0 security/integrity/ima/ima_main.c:385 > > ima_file_check+0x8e/0xd0 security/integrity/ima/ima_main.c:613 > > security_file_post_open+0xbf/0x530 security/security.c:3130 > > do_open fs/namei.c:3882 [inline] > > path_openat+0x5ac3/0x6760 fs/namei.c:4039 > > do_filp_open+0x280/0x660 fs/namei.c:4066 > > do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429 > > do_sys_open fs/open.c:1444 [inline] > > __do_sys_openat fs/open.c:1460 [inline] > > __se_sys_openat fs/open.c:1455 [inline] > > __x64_sys_openat+0x240/0x300 fs/open.c:1455 > > x64_sys_call+0x213/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:258 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > > CPU: 0 UID: 0 PID: 7337 Comm: syz.2.106 Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 > > ===================================================== > > > > > > --- > > 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@...glegroups.com. > > > > 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 >
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