From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi2-f3.google.com (mail-oi2-f3.google.com [74.125.231.195]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2C06F3D332A for ; Sat, 29 Aug 2026 18:27:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.195 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788028062; cv=none; b=e7xIl06w3nnqsSEmOvAuRGKhWgMrGzP2nYTx2Ro6dY9b1w6yhY6by4f0LcGmEZwHuob/eUlYq4eeO+xp8LoL485Sl8oFEBZKeNB1OaL8xHSqSeKd592EQNsI5y0F92+tAil2csTlabXbX9/ERhTVec5FWyKbpSajBM6DnuLMiis= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788028062; c=relaxed/simple; bh=qmIY9cd4YfgD5xSO1PnpOaIsQXH/XfPQKGC4HygGPOs=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To:Cc: Content-Type; b=mAjSs0HqEm6q0oJ5pN9WL5RRDeIjCS/5WlyTe9Gy3MHifvVb3/DiO3bOpa87OUpTFZtrRavyqVm36p32LxLeEzOGcGfcV4n5cgN1BwxtBLQrm+vTFkjDsdg1Dvmfxsk2ldLNZnDAiLMlgqFqvWEBtW78jP2Gaxj8fRwLPkCr2UI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=74.125.231.195 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi2-f3.google.com with SMTP id 5614622812f47-4b38a6e8c79so881797b6e.1 for ; Sat, 29 Aug 2026 11:27:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788028058; x=1788632858; h=content-type:cc:to:from:subject:message-id:in-reply-to:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=VjRRuz0jNscHK4iFPXII8dmeH+0Ecm+OwBXd0YtveV8=; b=AjzshiutqCydxnT77BawkwWIh2grs0gzRz3HJY9nL+R4pPFgZLbLChc1HovmJWWXmC fao1ZtWyXmtxBVm4gb2emHHa6kJepZZ9IicmvUy8KrX90DpGJ1LTihI6glsD/vbg1EW7 OridqTXiDq4thF4SlY5Hmy+F2UQjKpRWfh3WEAYXfXWsKY75BBAmx7S/z1y+t8cCUCxh YOCii7N45fn6tm3+hsJo4JJDhyrONtx2RfwtaW1KiuRcEKgEydHHjX/yRh82iIX21Ogy fKLFtpZDghAAKE1u4DUxjY9UZeRDd74eg1xfTRo8RodCrXS9vOMvMe1E1ppD+3Tqv8ZO mKsA== X-Forwarded-Encrypted: i=1; AHgh+RoCp0r1kZE+iub1Qt2PCsi/6BdJOFbVf0QQs2IEdcVbtmvl73xEb//w3tEk2kWddsgHM4FlAuuK2G1lywA=@vger.kernel.org X-Gm-Message-State: AFuF++mdsRd0raBO6JjqGTk7dvqPdLGOXcy3VY5Cm3yOMbkFAmf09aML tTh2Vh27Gt9RTvRZralbQR/T9IT35NKqb+jOJVcDn0CVPbC2DiHrVoQULfd8sMdZBldOBGwaB8W uMn9CRNx18Lqa6uy1UbIZm+RnewY1fm6zmKtlyPF0zZP5po+svBnp8Hu3YoI= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:4f48:b0:4a0:d9a1:1a95 with SMTP id 5614622812f47-4b3981b36ffmr16005896b6e.14.1788028058163; Sat, 29 Aug 2026 11:27:38 -0700 (PDT) Date: Sat, 29 Aug 2026 11:27:38 -0700 In-Reply-To: <2A2D4D25-BB50-40A5-AF2F-956EBDB07876@mainlining.org> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a93249a.4d659fcc.734b4.002d.GAE@google.com> Subject: Re: [syzbot] [audit?] BUG: unable to handle kernel paging request in integrity_audit_message From: syzbot To: brads@mainlining.org Cc: audit@vger.kernel.org, brads@mainlining.org, eparis@redhat.com, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, paul@paul-moore.com, roberto.sassu@huawei.com, stable@vger.kernel.org, syzkaller-bugs@googlegroups.com, zohar@linux.ibm.com Content-Type: text/plain; charset="UTF-8" > On 29 August 2026 19:12:29 BST, syzbot > wrote: >>syzbot has found a reproducer for the following issue on: >> > > #syz test: dentry_path() returns ERR_PTR(-ENAMETOOLONG) when the path I've failed to parse your command. Did you perhaps forget to provide the branch name, or added an extra ':'? Please use one of the two supported formats: 1. #syz test 2. #syz test: repo branch-or-commit-hash Note the lack of ':' in option 1. > exceeds the > buffer. validate_hash_algo() passes the result straight to > integrity_audit_msg() without checking. ERR_PTR is not NULL, so > integrity_audit_message() sees a valid pointer and calls strlen() on > it, which faults: > > BUG: unable to handle page fault for address: ffffffffffffffdc > RIP: 0010:strlen+0x30/0xa0 > Call Trace: > audit_log_untrustedstring+0x19/0x30 > integrity_audit_message+0x366/0x4f0 > ima_inode_setxattr+0x512/0x5f0 > > Check for IS_ERR() and use NULL instead, which makes the audit message > skip the name= field instead of crashing. > > Fixes: 4f2946aa0c45 ("IMA: introduce a new policy option func=SETXATTR_CHECK") > Cc: stable@vger.kernel.org > Reported-by: syzbot+5ebeb3089ea6439c37be@syzkaller.appspotmail.com > Link: https://lore.kernel.org/all/6a8f89e5.1d9ded08.62e62.00bf.GAE@google.com/ > Signed-off-by: Bradley Morgan > security/integrity/ima/ima_appraise.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c > index ced2e131b061..b280488e15fc 100644 > --- a/security/integrity/ima/ima_appraise.c > +++ b/security/integrity/ima/ima_appraise.c > @@ -748,6 +748,8 @@ static int validate_hash_algo(struct dentry *dentry, > return -EACCES; > > path = dentry_path(dentry, pathbuf, PATH_MAX); > + if (IS_ERR(path)) > + path = NULL; > > integrity_audit_msg(AUDIT_INTEGRITY_DATA, d_inode(dentry), path, > "set_data", errmsg, -EACCES, 0); > -- > 2.47.3 > >>HEAD commit: cf72cbb39da8 Merge tag 'io_uring-7.3-20260828' of >>git://gi.. >>git tree: upstream >>console output: https://syzkaller.appspot.com/x/log.txt?x=16e7cc15580000 >>kernel config: https://syzkaller.appspot.com/x/.config?x=85bc5cc2fc7394d9 >>dashboard link: >>https://syzkaller.appspot.com/bug?extid=5ebeb3089ea6439c37be >>compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 >>userspace arch: i386 >>syz repro: https://syzkaller.appspot.com/x/repro.syz?x=159ebd79580000 >>C reproducer: https://syzkaller.appspot.com/x/repro.c?x=123d1d79580000 >> >>Downloadable assets: >>disk image (non-bootable): >>https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-cf72cbb3.raw.xz >>vmlinux: https://storage.googleapis.com/syzbot-assets/755d053ff703/vmlinux-cf72cbb3.xz >>kernel image: >>https://storage.googleapis.com/syzbot-assets/0837738ba281/bzImage-cf72cbb3.xz >> >>IMPORTANT: if you fix the issue, please add the following tag to the commit: >>Reported-by: syzbot+5ebeb3089ea6439c37be@syzkaller.appspotmail.com >> >>BUG: unable to handle page fault for address: ffffffffffffffdc >>#PF: supervisor read access in kernel mode >>#PF: error_code(0x0000) - not-present page >>PGD eb99067 P4D eb99067 PUD eb9b067 PMD 0 >>Oops: Oops: 0000 [#1] SMP KASAN NOPTI >>CPU: 0 UID: 0 PID: 5921 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) >>Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS >>1.16.3-debian-1.16.3-2 04/01/2014 >>RIP: 0010:strlen+0x30/0xa0 lib/string.c:402 >>Code: 00 00 00 00 00 fc ff df 55 48 89 fa 48 89 fd 53 48 c1 ea 03 48 83 ec 08 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 50 <80> 7d 00 00 74 3d 48 bb 00 00 00 00 00 fc ff df 48 89 e8 48 83 c0 >>RSP: 0018:ffffc90002eb7920 EFLAGS: 00010246 >>RAX: 0000000000000000 RBX: ffffffffffffffdc RCX: 0000000000000000 >>RDX: 0000000000000004 RSI: ffffffff82081bc1 RDI: ffffffffffffffdc >>RBP: ffffffffffffffdc R08: 0000000000000004 R09: 00000000000000a9 >>R10: 00000000000006c0 R11: 0000000000000001 R12: ffff888027be0e40 >>R13: 0000000000000007 R14: 00000000fffffff3 R15: ffffffffffffffdc >>FS: 0000000000000000(0000) GS:ffff888096967000(0063) knlGS:000000005783f480 >>CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 >>CR2: ffffffffffffffdc CR3: 0000000055e55000 CR4: 0000000000352ef0 >>Call Trace: >> >> __fortify_strlen include/linux/fortify-string.h:218 [inline] >> audit_log_untrustedstring+0x19/0x30 kernel/audit.c:2203 >> integrity_audit_message+0x366/0x4f0 >> security/integrity/integrity_audit.c:60 >> integrity_audit_msg+0x41/0x60 security/integrity/integrity_audit.c:32 >> validate_hash_algo security/integrity/ima/ima_appraise.c:752 [inline] >> ima_inode_setxattr+0x512/0x5f0 security/integrity/ima/ima_appraise.c:775 >> security_inode_setxattr+0x299/0x560 security/security.c:1940 >> __vfs_setxattr_locked+0xad/0x2b0 fs/xattr.c:309 >> vfs_setxattr+0x14a/0x390 fs/xattr.c:344 >> do_setxattr+0x145/0x180 fs/xattr.c:662 >> file_setxattr fs/xattr.c:672 [inline] >> file_setxattr+0x139/0x1b0 fs/xattr.c:666 >> path_setxattrat+0x335/0x3b0 fs/xattr.c:732 >> __do_sys_fsetxattr fs/xattr.c:782 [inline] >> __se_sys_fsetxattr fs/xattr.c:779 [inline] >> __ia32_sys_fsetxattr+0xc4/0x140 fs/xattr.c:779 >> do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline] >> __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291 >> do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316 >> entry_SYSENTER_compat_after_hwframe+0x84/0x8e >>RIP: 0023:0xf7fb7fec >>Code: Unable to access opcode bytes at 0xf7fb7fc2. >>RSP: 002b:00000000fffd97bc EFLAGS: 00000296 ORIG_RAX: 00000000000000e4 >>RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000080000080 >>RDX: 0000000080001080 RSI: 0000000000000002 RDI: 0000000000000000 >>RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 >>R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 >>R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 >> >>Modules linked in: >>CR2: ffffffffffffffdc >>---[ end trace 0000000000000000 ]--- >>RIP: 0010:strlen+0x30/0xa0 lib/string.c:402 >>Code: 00 00 00 00 00 fc ff df 55 48 89 fa 48 89 fd 53 48 c1 ea 03 48 83 ec 08 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 50 <80> 7d 00 00 74 3d 48 bb 00 00 00 00 00 fc ff df 48 89 e8 48 83 c0 >>RSP: 0018:ffffc90002eb7920 EFLAGS: 00010246 >>RAX: 0000000000000000 RBX: ffffffffffffffdc RCX: 0000000000000000 >>RDX: 0000000000000004 RSI: ffffffff82081bc1 RDI: ffffffffffffffdc >>RBP: ffffffffffffffdc R08: 0000000000000004 R09: 00000000000000a9 >>R10: 00000000000006c0 R11: 0000000000000001 R12: ffff888027be0e40 >>R13: 0000000000000007 R14: 00000000fffffff3 R15: ffffffffffffffdc >>FS: 0000000000000000(0000) GS:ffff888096967000(0063) knlGS:000000005783f480 >>CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 >>CR2: 00000000f7fb8000 CR3: 0000000055e55000 CR4: 0000000000352ef0 >>---------------- >>Code disassembly (best guess): >> 0: 00 00 add %al,(%rax) >> 2: 00 00 add %al,(%rax) >> 4: 00 fc add %bh,%ah >> 6: ff lcall (bad) >> 7: df 55 48 fists 0x48(%rbp) >> a: 89 fa mov %edi,%edx >> c: 48 89 fd mov %rdi,%rbp >> f: 53 push %rbx >> 10: 48 c1 ea 03 shr $0x3,%rdx >> 14: 48 83 ec 08 sub $0x8,%rsp >> 18: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax >> 1c: 48 89 fa mov %rdi,%rdx >> 1f: 83 e2 07 and $0x7,%edx >> 22: 38 d0 cmp %dl,%al >> 24: 7f 04 jg 0x2a >> 26: 84 c0 test %al,%al >> 28: 75 50 jne 0x7a >>* 2a: 80 7d 00 00 cmpb $0x0,0x0(%rbp) <-- trapping instruction >> 2e: 74 3d je 0x6d >> 30: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx >> 37: fc ff df >> 3a: 48 89 e8 mov %rbp,%rax >> 3d: 48 rex.W >> 3e: 83 .byte 0x83 >> 3f: c0 .byte 0xc0 >> >> >>--- >>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. >> > > --- Thanks! > https://lore.kernel.org/all/EE579805-42F2-4C58-B752-F28779EEB717@grrlz.net/