audit: EXECVE record - removed bogus newline

(updated)
Added hunk that changes the comment, the rest is the same.

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>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 2bfc647867654874df4c36d8009e87c5f6764728..738c03695b791ae7536693f99f27c89c84a01c05 100644 (file)
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1024,7 +1024,7 @@ static int audit_log_single_execve_arg(struct audit_context *context,
 {
        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;
@@ -1110,7 +1110,7 @@ static int audit_log_single_execve_arg(struct audit_context *context,
                 * 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);
 
                /*
@@ -1130,7 +1130,7 @@ static int audit_log_single_execve_arg(struct audit_context *context,
                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, "=");
@@ -1138,7 +1138,6 @@ static int audit_log_single_execve_arg(struct audit_context *context,
                        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;
@@ -1166,7 +1165,7 @@ static void audit_log_execve_info(struct audit_context *context,
 
        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