[PATCH v3 2/3] audit: add support for the openat2 syscall

Richard Guy Briggs
2021-04-30T20:36:56Z

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 ++
include/linux/auditscm.h | 1 +
kernel/auditsc.c | 3 +++
lib/audit.c | 4 ++++
lib/compat_audit.c | 4 ++++
16 files changed, 36 insertions(+)

diff --git a/arch/alpha/kernel/audit.c b/arch/alpha/kernel/audit.c
index 81cbd804e375..3ab04709784a 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 AUDITSC_OPENAT;
case __NR_execve:
return AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_NATIVE;
}
diff --git a/arch/ia64/kernel/audit.c b/arch/ia64/kernel/audit.c
index dba6a74c9ab3..ec61f20ca61f 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 AUDITSC_OPENAT;
case __NR_execve:
return AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_NATIVE;
}
diff --git a/arch/parisc/kernel/audit.c b/arch/parisc/kernel/audit.c
index 14244e83db75..f420b5552140 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 AUDITSC_OPENAT;
case __NR_execve:
return AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_NATIVE;
}
diff --git a/arch/parisc/kernel/compat_audit.c b/arch/parisc/kernel/compat_audit.c
index 0c181bb39f34..02cfd9d1ebeb 100644
--- a/arch/parisc/kernel/compat_audit.c
+++ b/arch/parisc/kernel/compat_audit.c
@@ -36,6 +36,8 @@ int parisc32_classify_syscall(unsigned syscall)
return AUDITSC_OPENAT;
case __NR_execve:
return AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_COMPAT;
}
diff --git a/arch/powerpc/kernel/audit.c b/arch/powerpc/kernel/audit.c
index 6eb18ef77dff..1bcfca5fdf67 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 AUDITSC_SOCKETCALL;
case __NR_execve:
return AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_NATIVE;
}
diff --git a/arch/powerpc/kernel/compat_audit.c b/arch/powerpc/kernel/compat_audit.c
index f250777f6365..1fa0c902be8a 100644
--- a/arch/powerpc/kernel/compat_audit.c
+++ b/arch/powerpc/kernel/compat_audit.c
@@ -39,6 +39,8 @@ int ppc32_classify_syscall(unsigned syscall)
return AUDITSC_SOCKETCALL;
case __NR_execve:
return AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_COMPAT;
}
diff --git a/arch/s390/kernel/audit.c b/arch/s390/kernel/audit.c
index 7e331e1831d4..02051a596b87 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 AUDITSC_SOCKETCALL;
case __NR_execve:
return AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_NATIVE;
}
diff --git a/arch/s390/kernel/compat_audit.c b/arch/s390/kernel/compat_audit.c
index b2a2ed5d605a..320b5e7d96f0 100644
--- a/arch/s390/kernel/compat_audit.c
+++ b/arch/s390/kernel/compat_audit.c
@@ -40,6 +40,8 @@ int s390_classify_syscall(unsigned syscall)
return AUDITSC_SOCKETCALL;
case __NR_execve:
return AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_COMPAT;
}
diff --git a/arch/sparc/kernel/audit.c b/arch/sparc/kernel/audit.c
index 50fab35bdaba..b092274eca79 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 AUDITSC_SOCKETCALL;
case __NR_execve:
return AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_NATIVE;
}
diff --git a/arch/sparc/kernel/compat_audit.c b/arch/sparc/kernel/compat_audit.c
index fdf0d70b569b..b0a7d0112b96 100644
--- a/arch/sparc/kernel/compat_audit.c
+++ b/arch/sparc/kernel/compat_audit.c
@@ -40,6 +40,8 @@ int sparc32_classify_syscall(unsigned int syscall)
return AUDITSC_SOCKETCALL;
case __NR_execve:
return AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_COMPAT;
}
diff --git a/arch/x86/ia32/audit.c b/arch/x86/ia32/audit.c
index d3dc8b57df81..8f6bf3a46a3a 100644
--- a/arch/x86/ia32/audit.c
+++ b/arch/x86/ia32/audit.c
@@ -40,6 +40,8 @@ int ia32_classify_syscall(unsigned syscall)
case __NR_execve:
case __NR_execveat:
return AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_COMPAT;
}
diff --git a/arch/x86/kernel/audit_64.c b/arch/x86/kernel/audit_64.c
index 2a6cc9c9c881..44c3601cfdc4 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 AUDITSC_EXECVE;
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
default:
return AUDITSC_NATIVE;
}
diff --git a/include/linux/auditscm.h b/include/linux/auditscm.h
index 1c4f0ead5931..0893c373e12b 100644
--- a/include/linux/auditscm.h
+++ b/include/linux/auditscm.h
@@ -16,6 +16,7 @@ enum auditsc_class_t {
AUDITSC_OPENAT,
AUDITSC_SOCKETCALL,
AUDITSC_EXECVE,
+ AUDITSC_OPENAT2,

AUDITSC_NVALS /* count */
};
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 8807afa6e237..27c747e0d5ab 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 AUDITSC_EXECVE:
return mask & AUDIT_PERM_EXEC;
+ case AUDITSC_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 3ec1a94d8d64..738bda22dd39 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 AUDITSC_EXECVE;
+#ifdef __NR_openat2
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
+#endif
default:
return AUDITSC_NATIVE;
}
diff --git a/lib/compat_audit.c b/lib/compat_audit.c
index 63125ad2edc0..7ed9461b52b7 100644
--- a/lib/compat_audit.c
+++ b/lib/compat_audit.c
@@ -46,6 +46,10 @@ int audit_classify_compat_syscall(int abi, unsigned syscall)
#endif
case __NR_execve:
return AUDITSC_EXECVE;
+#ifdef __NR_openat2
+ case __NR_openat2:
+ return AUDITSC_OPENAT2;
+#endif
default:
return AUDITSC_COMPAT;
}
--
2.27.0