Abnormal End of Processes

[Steve Grubb]

Hi,

I have been working on some code that detects abnormal events based on 
audit system events. One kind of event that we currently have no visibility for is
when a program terminates due to segfault - which should never happen on a
production machine. And if it did, you'd want to investigate it. Attached is a
patch that collects these events and sends them into the audit system.

Signed-off-by: Steve Grubb <sgrubb at redhat.com>


diff -urp linux-2.6.18.x86_64.orig/fs/exec.c linux-2.6.18.x86_64/fs/exec.c
--- linux-2.6.18.x86_64.orig/fs/exec.c	2007-04-13 17:26:19.000000000 -0400
+++ linux-2.6.18.x86_64/fs/exec.c	2007-04-13 17:25:34.000000000 -0400
@@ -49,6 +49,7 @@
 #include <linux/acct.h>
 #include <linux/cn_proc.h>
 #include <linux/audit.h>
+#include <linux/selinux.h>
 
 #include <asm/uaccess.h>
 #include <asm/mmu_context.h>
@@ -1462,6 +1463,32 @@ int do_coredump(long signr, int exit_cod
 	int fsuid = current->fsuid;
 	int flag = 0;
 	int ispipe = 0;
+	extern int audit_enabled;
+
+	if (unlikely(audit_enabled) && signr != SIGQUIT && signr != SIGABRT) {
+		struct audit_buffer *ab;
+		u32 sid;
+
+		ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
+		audit_log_format(ab, "auid=%u uid=%u gid=%u",
+				audit_get_loginuid(current->audit_context),
+				current->uid, current->gid);
+		selinux_get_task_sid(current, &sid);
+		if (sid) {
+			char *ctx = NULL;
+			u32 len;
+
+			if (selinux_ctxid_to_string(sid, &ctx, &len))
+				audit_log_format(ab, " ssid=%u", sid);
+			else
+				audit_log_format(ab, " subj=%s", ctx);
+			kfree(ctx);
+		}
+		audit_log_format(ab, " pid=%d comm=", current->pid);
+		audit_log_untrustedstring(ab, current->comm);
+		audit_log_format(ab, " sig=%ld", signr);
+		audit_log_end(ab);
+	}
 
 	binfmt = current->binfmt;
 	if (!binfmt || !binfmt->core_dump)
diff -urp linux-2.6.18.x86_64.orig/include/linux/audit.h linux-2.6.18.x86_64/include/linux/audit.h
--- linux-2.6.18.x86_64.orig/include/linux/audit.h	2007-04-13 17:26:21.000000000 -0400
+++ linux-2.6.18.x86_64/include/linux/audit.h	2007-04-13 17:20:37.000000000 -0400
@@ -111,6 +111,7 @@
 #define AUDIT_FIRST_KERN_ANOM_MSG   1700
 #define AUDIT_LAST_KERN_ANOM_MSG    1799
 #define AUDIT_ANOM_PROMISCUOUS      1700 /* Device changed promiscuous mode */
+#define AUDIT_ANOM_ABEND            1701 /* Process ended abnormally */
 
 #define AUDIT_KERNEL		2000	/* Asynchronous audit record. NOT A REQUEST. */