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From:   Richard Guy Briggs <rgb@redhat.com>
To:     Linux-Audit Mailing List <linux-audit@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>
Cc:     Paul Moore <paul@paul-moore.com>,
        Eric Paris <eparis@parisplace.org>,
        Steve Grubb <sgrubb@redhat.com>,
        Richard Guy Briggs <rgb@redhat.com>, x86@kernel.org,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Eric Paris <eparis@redhat.com>, linux-alpha@vger.kernel.org,
        linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
        sparclinux@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH 1/2] audit: add support for the openat2 syscall
Date:   Wed, 17 Mar 2021 21:47:17 -0400
Message-Id: <49510cacfb5fbbaa312a4a389f3a6619675007ab.1616031035.git.rgb@redhat.com>
In-Reply-To: <cover.1616031035.git.rgb@redhat.com>
References: <cover.1616031035.git.rgb@redhat.com>
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The openat2(2) syscall was added in kernel v5.6 with commit fddb5d430ad9
("open: introduce openat2(2) syscall")

Add the openat2(2) syscall to the audit syscall classifier.

See the github issue
https://github.com/linux-audit/audit-kernel/issues/67

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
 arch/alpha/kernel/audit.c          | 2 ++
 arch/ia64/kernel/audit.c           | 2 ++
 arch/parisc/kernel/audit.c         | 2 ++
 arch/parisc/kernel/compat_audit.c  | 2 ++
 arch/powerpc/kernel/audit.c        | 2 ++
 arch/powerpc/kernel/compat_audit.c | 2 ++
 arch/s390/kernel/audit.c           | 2 ++
 arch/s390/kernel/compat_audit.c    | 2 ++
 arch/sparc/kernel/audit.c          | 2 ++
 arch/sparc/kernel/compat_audit.c   | 2 ++
 arch/x86/ia32/audit.c              | 2 ++
 arch/x86/kernel/audit_64.c         | 2 ++
 kernel/auditsc.c                   | 3 +++
 lib/audit.c                        | 4 ++++
 lib/compat_audit.c                 | 4 ++++
 15 files changed, 35 insertions(+)

diff --git a/arch/alpha/kernel/audit.c b/arch/alpha/kernel/audit.c
index 96a9d18ff4c4..06a911b685d1 100644
--- a/arch/alpha/kernel/audit.c
+++ b/arch/alpha/kernel/audit.c
@@ -42,6 +42,8 @@ int audit_classify_syscall(int abi, unsigned syscall)
 		return 3;
 	case __NR_execve:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 0;
 	}
diff --git a/arch/ia64/kernel/audit.c b/arch/ia64/kernel/audit.c
index 5192ca899fe6..5eaa888c8fd3 100644
--- a/arch/ia64/kernel/audit.c
+++ b/arch/ia64/kernel/audit.c
@@ -43,6 +43,8 @@ int audit_classify_syscall(int abi, unsigned syscall)
 		return 3;
 	case __NR_execve:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 0;
 	}
diff --git a/arch/parisc/kernel/audit.c b/arch/parisc/kernel/audit.c
index 9eb47b2225d2..fc721a7727ba 100644
--- a/arch/parisc/kernel/audit.c
+++ b/arch/parisc/kernel/audit.c
@@ -52,6 +52,8 @@ int audit_classify_syscall(int abi, unsigned syscall)
 		return 3;
 	case __NR_execve:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 0;
 	}
diff --git a/arch/parisc/kernel/compat_audit.c b/arch/parisc/kernel/compat_audit.c
index 20c39c9d86a9..fc6d35918c44 100644
--- a/arch/parisc/kernel/compat_audit.c
+++ b/arch/parisc/kernel/compat_audit.c
@@ -35,6 +35,8 @@ int parisc32_classify_syscall(unsigned syscall)
 		return 3;
 	case __NR_execve:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 1;
 	}
diff --git a/arch/powerpc/kernel/audit.c b/arch/powerpc/kernel/audit.c
index a2dddd7f3d09..8f32700b0baa 100644
--- a/arch/powerpc/kernel/audit.c
+++ b/arch/powerpc/kernel/audit.c
@@ -54,6 +54,8 @@ int audit_classify_syscall(int abi, unsigned syscall)
 		return 4;
 	case __NR_execve:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 0;
 	}
diff --git a/arch/powerpc/kernel/compat_audit.c b/arch/powerpc/kernel/compat_audit.c
index 55c6ccda0a85..ebe45534b1c9 100644
--- a/arch/powerpc/kernel/compat_audit.c
+++ b/arch/powerpc/kernel/compat_audit.c
@@ -38,6 +38,8 @@ int ppc32_classify_syscall(unsigned syscall)
 		return 4;
 	case __NR_execve:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 1;
 	}
diff --git a/arch/s390/kernel/audit.c b/arch/s390/kernel/audit.c
index d395c6c9944c..d964cb94cfaf 100644
--- a/arch/s390/kernel/audit.c
+++ b/arch/s390/kernel/audit.c
@@ -54,6 +54,8 @@ int audit_classify_syscall(int abi, unsigned syscall)
 		return 4;
 	case __NR_execve:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 0;
 	}
diff --git a/arch/s390/kernel/compat_audit.c b/arch/s390/kernel/compat_audit.c
index 444fb1f66944..f7b32933ce0e 100644
--- a/arch/s390/kernel/compat_audit.c
+++ b/arch/s390/kernel/compat_audit.c
@@ -39,6 +39,8 @@ int s390_classify_syscall(unsigned syscall)
 		return 4;
 	case __NR_execve:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 1;
 	}
diff --git a/arch/sparc/kernel/audit.c b/arch/sparc/kernel/audit.c
index a6e91bf34d48..b6dcca9c6520 100644
--- a/arch/sparc/kernel/audit.c
+++ b/arch/sparc/kernel/audit.c
@@ -55,6 +55,8 @@ int audit_classify_syscall(int abi, unsigned int syscall)
 		return 4;
 	case __NR_execve:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 0;
 	}
diff --git a/arch/sparc/kernel/compat_audit.c b/arch/sparc/kernel/compat_audit.c
index 10eeb4f15b20..d2652a1083ad 100644
--- a/arch/sparc/kernel/compat_audit.c
+++ b/arch/sparc/kernel/compat_audit.c
@@ -39,6 +39,8 @@ int sparc32_classify_syscall(unsigned int syscall)
 		return 4;
 	case __NR_execve:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 1;
 	}
diff --git a/arch/x86/ia32/audit.c b/arch/x86/ia32/audit.c
index 6efe6cb3768a..57a02ade5503 100644
--- a/arch/x86/ia32/audit.c
+++ b/arch/x86/ia32/audit.c
@@ -39,6 +39,8 @@ int ia32_classify_syscall(unsigned syscall)
 	case __NR_execve:
 	case __NR_execveat:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 1;
 	}
diff --git a/arch/x86/kernel/audit_64.c b/arch/x86/kernel/audit_64.c
index 83d9cad4e68b..39de1e021258 100644
--- a/arch/x86/kernel/audit_64.c
+++ b/arch/x86/kernel/audit_64.c
@@ -53,6 +53,8 @@ int audit_classify_syscall(int abi, unsigned syscall)
 	case __NR_execve:
 	case __NR_execveat:
 		return 5;
+	case __NR_openat2:
+		return 6;
 	default:
 		return 0;
 	}
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 8bb9ac84d2fb..f5616e70d129 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -76,6 +76,7 @@
 #include <linux/fsnotify_backend.h>
 #include <uapi/linux/limits.h>
 #include <uapi/linux/netfilter/nf_tables.h>
+#include <uapi/linux/openat2.h>
 
 #include "audit.h"
 
@@ -195,6 +196,8 @@ static int audit_match_perm(struct audit_context *ctx, int mask)
 		return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
 	case 5: /* execve */
 		return mask & AUDIT_PERM_EXEC;
+	case 6: /* openat2 */
+		return mask & ACC_MODE((u32)((struct open_how *)ctx->argv[2])->flags);
 	default:
 		return 0;
 	}
diff --git a/lib/audit.c b/lib/audit.c
index 5004bff928a7..8f030b9a2d10 100644
--- a/lib/audit.c
+++ b/lib/audit.c
@@ -60,6 +60,10 @@ int audit_classify_syscall(int abi, unsigned syscall)
 #endif
 	case __NR_execve:
 		return 5;
+#ifdef __NR_openat2
+	case __NR_openat2:
+		return 6;
+#endif
 	default:
 		return 0;
 	}
diff --git a/lib/compat_audit.c b/lib/compat_audit.c
index 77eabad69b4a..8aff0d0d9ba0 100644
--- a/lib/compat_audit.c
+++ b/lib/compat_audit.c
@@ -45,6 +45,10 @@ int audit_classify_compat_syscall(int abi, unsigned syscall)
 #endif
 	case __NR_execve:
 		return 5;
+#ifdef __NR_openat2
+	case __NR_openat2:
+		return 6;
+#endif
 	default:
 		return 1;
 	}
-- 
2.27.0