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Add wrapper for GLIBC __syslog_chk(), used for fortification

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When a user links with syslog.c, or the future libsyslog, they may still
use the standard GLIBC header files.  GLIBC redirects syslog() to the
__syslog_chk() definition early on, but a user may not notice when a
simple non-optimized (-O0 or none) program is compiled.

This currently does not affect musl libc.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson 2019-10-24 08:48:32 +02:00
parent 097d9efdbe
commit 6c23333feb
1 changed files with 10 additions and 0 deletions
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10
src/syslog.c
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@ -91,6 +91,16 @@ static int LogStat = 0; /* status bits, set by openlog() */
static const char *LogTag = "syslog"; /* string to tag the entry with */
static int LogFacility = LOG_USER; /* default facility code */
/* wrapper for GLIBC, which provides this for security measures */
void __syslog_chk(int pri, int flag __attribute__((unused)), const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vsyslog(pri, fmt, ap);
va_end(ap);
}
void syslog(int pri, const char *fmt, ...)
{
va_list ap;