Commit ea956d8b authored Oct 10, 2018 by Richard Guy Briggs Committed by Paul Moore Nov 05, 2018

audit: print empty EXECVE args

Empty executable arguments were being skipped when printing out the list
of arguments in an EXECVE record, making it appear they were somehow
lost.  Include empty arguments as an itemized empty string.

Reproducer:
	autrace /bin/ls "" "/etc"
	ausearch --start recent -m execve -i | grep EXECVE
	type=EXECVE msg=audit(10/03/2018 13:04:03.208:1391) : argc=3 a0=/bin/ls a2=/etc

With fix:
	type=EXECVE msg=audit(10/03/2018 21:51:38.290:194) : argc=3 a0=/bin/ls a1= a2=/etc
	type=EXECVE msg=audit(1538617898.290:194): argc=3 a0="/bin/ls" a1="" a2="/etc"

Passes audit-testsuite.  GH issue tracker at
https://github.com/linux-audit/audit-kernel/issues/99



Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
[PM: cleaned up the commit metadata]
Signed-off-by: Paul Moore <paul@paul-moore.com>

parent 65102238

kernel/auditsc.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1107,7 +1107,7 @@ static void audit_log_execve_info(struct audit_context *context,
		}

		/* write as much as we can to the audit log */
		if (len_buf > 0) {
		if (len_buf >= 0) {
		/* NOTE: some magic numbers here - basically if we
		* can't fit a reasonable amount of data into the
		* existing audit buffer, flush it and start with