Audit: better estimation of execve record length (b87ce6e4) · Commits · 戴 / test

The audit execve record splitting code estimates the length of the message generated. But it forgot to include the "" that wrap each string in its estimation. This means that execve messages with lots of tiny (1-2 byte) arguments could still cause records greater than 8k to be emitted. Simply fix the estimate. Signed-off-by:

Eric Paris <eparis@redhat.com>

kernel/auditsc.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -1024,8 +1024,8 @@ 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=" */
		size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 3;
		/* how many digits are in arg_num? 5 is the length of ' a=""' */
		size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 5;
		size_t len, len_left, to_send;
		size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN;
		unsigned int i, has_cntl = 0, too_long = 0;

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