[patch 2/3] audit: EXECVE record: remove bogus newline

[patch 2/3] audit: EXECVE record: remove bogus newline

[akpm]

From: Jiri Pirko <jpirko@redhat.com>

EXECVE records contain a newline after every argument.  auditd converts
"\n" to " " so you cannot see newlines even in raw logs, but they're there
nevertheless.  If you're not using auditd, you need to work round them. 
These '\n' chars are can be easily replaced by spaces when creating record
in kernel.  Note there is no need for trailing '\n' in an audit record.

record before this patch:
"type=EXECVE msg=audit(1231421801.566:31): argc=4 a0=\"./test\"\na1=\"a\"\na2=\"b\"\na3=\"c\"\n"

record after this patch:
"type=EXECVE msg=audit(1231421801.566:31): argc=4 a0=\"./test\" a1=\"a\" a2=\"b\" a3=\"c\""

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Acked-by: Eric Paris <eparis@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/auditsc.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff -puN kernel/auditsc.c~audit-execve-record-remove-bogus-newline kernel/auditsc.c
--- a/kernel/auditsc.c~audit-execve-record-remove-bogus-newline
+++ a/kernel/auditsc.c
@@ -1023,7 +1023,7 @@ static int audit_log_single_execve_arg(s
 {
 	char arg_num_len_buf[12];
 	const char __user *tmp_p = p;
-	/* how many digits are in arg_num? 3 is the length of a=\n */
+	/* how many digits are in arg_num? 3 is the length of " a=" */
 	size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 3;
 	size_t len, len_left, to_send;
 	size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN;
@@ -1109,7 +1109,7 @@ static int audit_log_single_execve_arg(s
 		 * so we can be sure nothing was lost.
 		 */
 		if ((i == 0) && (too_long))
-			audit_log_format(*ab, "a%d_len=%zu ", arg_num,
+			audit_log_format(*ab, " a%d_len=%zu", arg_num,
 					 has_cntl ? 2*len : len);
 
 		/*
@@ -1129,7 +1129,7 @@ static int audit_log_single_execve_arg(s
 		buf[to_send] = '\0';
 
 		/* actually log it */
-		audit_log_format(*ab, "a%d", arg_num);
+		audit_log_format(*ab, " a%d", arg_num);
 		if (too_long)
 			audit_log_format(*ab, "[%d]", i);
 		audit_log_format(*ab, "=");
@@ -1137,7 +1137,6 @@ static int audit_log_single_execve_arg(s
 			audit_log_n_hex(*ab, buf, to_send);
 		else
 			audit_log_format(*ab, "\"%s\"", buf);
-		audit_log_format(*ab, "\n");
 
 		p += to_send;
 		len_left -= to_send;
@@ -1165,7 +1164,7 @@ static void audit_log_execve_info(struct
 
 	p = (const char __user *)axi->mm->arg_start;
 
-	audit_log_format(*ab, "argc=%d ", axi->argc);
+	audit_log_format(*ab, "argc=%d", axi->argc);
 
 	/*
 	 * we need some kernel buffer to hold the userspace args.  Just
_