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libselinux: Do not clobber errno of the world #445

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libselinux: Do not clobber errno of the world #445

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1 change: 1 addition & 0 deletions libselinux/src/init.c
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Original file line number Diff line number Diff line change
Expand Up @@ -146,6 +146,7 @@ void set_selinuxmnt(const char *mnt)
static void init_lib(void) __attribute__ ((constructor));
static void init_lib(void)
{
SELINUX_PROTECT_ERRNO;
selinux_page_size = sysconf(_SC_PAGE_SIZE);
init_selinuxmnt();
#ifndef ANDROID
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10 changes: 10 additions & 0 deletions libselinux/src/selinux_internal.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@

#include <selinux/selinux.h>
#include <pthread.h>
#include <errno.h>


extern int require_seusers ;
Expand Down Expand Up @@ -131,4 +132,13 @@ void *reallocarray(void *ptr, size_t nmemb, size_t size);
#define IGNORE_DEPRECATED_DECLARATION_END
#endif

static inline void selinux_reset_errno(int *saved_errno) {
if (*saved_errno < 0)
return;

errno = *saved_errno;
}

#define SELINUX_PROTECT_ERRNO __attribute__((__cleanup__(selinux_reset_errno))) \
__attribute__((__unused__)) int __selinux_saved_errno = errno
#endif /* SELINUX_INTERNAL_H_ */