From d2c604d5a40bc75fe83a62fd20377c20a73aa0d5 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Mon, 18 Apr 2011 21:11:23 -0400 Subject: protect syslog against cancellation these functions are allowed to be cancellation points, but then we would have to install cleanup handlers to avoid termination with locks held. --- src/misc/syslog.c | 24 +++++++++++++++++++----- 1 file changed, 19 insertions(+), 5 deletions(-) (limited to 'src/misc') diff --git a/src/misc/syslog.c b/src/misc/syslog.c index 0f75764..cbe6520 100644 --- a/src/misc/syslog.c +++ b/src/misc/syslog.c @@ -7,6 +7,7 @@ #include #include #include +#include #include "libc.h" static int lock; @@ -33,10 +34,13 @@ static const struct { void closelog(void) { + int cs; + pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); LOCK(&lock); close(log_fd); log_fd = -1; UNLOCK(&lock); + pthread_setcancelstate(cs, 0); } static void __openlog(const char *ident, int opt, int facility) @@ -53,12 +57,15 @@ static void __openlog(const char *ident, int opt, int facility) void openlog(const char *ident, int opt, int facility) { + int cs; + pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); LOCK(&lock); __openlog(ident, opt, facility); UNLOCK(&lock); + pthread_setcancelstate(cs, 0); } -void __vsyslog(int priority, const char *message, va_list ap) +static void _vsyslog(int priority, const char *message, va_list ap) { char timebuf[16]; time_t now; @@ -67,10 +74,6 @@ void __vsyslog(int priority, const char *message, va_list ap) int pid; int l, l2; - if (!(log_mask & LOG_MASK(priority&7)) || (priority&~0x3ff)) return; - - LOCK(&lock); - if (log_fd < 0) { __openlog(log_ident, log_opt | LOG_NDELAY, log_facility); if (log_fd < 0) { @@ -98,6 +101,17 @@ void __vsyslog(int priority, const char *message, va_list ap) UNLOCK(&lock); } +void __vsyslog(int priority, const char *message, va_list ap) +{ + int cs; + if (!(log_mask & LOG_MASK(priority&7)) || (priority&~0x3ff)) return; + pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); + LOCK(&lock); + _vsyslog(priority, message, ap); + UNLOCK(&lock); + pthread_setcancelstate(cs, 0); +} + void syslog(int priority, const char *message, ...) { va_list ap; -- cgit v1.1