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Add PaX work-around

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This commit is contained in:
Anthony Green
2012-10-30 14:06:09 -04:00
parent 9ccd51be1f
commit e944b8c7eb
15 changed files with 24400 additions and 0 deletions
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27
src/closures.c
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@@ -172,6 +172,27 @@ selinux_enabled_check (void)
#endif /* !FFI_MMAP_EXEC_SELINUX */
/* On PaX enable kernels that have MPROTECT enable we can't use PROT_EXEC. */
#ifdef FFI_MMAP_EXEC_EMUTRAMP_PAX
#include <stdlib.h>
static int emutramp_enabled = -1;
static int
emutramp_enabled_check (void)
{
if (getenv ("FFI_DISABLE_EMUTRAMP") == NULL)
return 1;
else
return 0;
}
#define is_emutramp_enabled() (emutramp_enabled >= 0 ? emutramp_enabled \
: (emutramp_enabled = emutramp_enabled_check ()))
#else
#define is_emutramp_enabled() 0
#endif /* FFI_MMAP_EXEC_EMUTRAMP_PAX */
#elif defined (__CYGWIN__) || defined(__INTERIX)
#include <sys/mman.h>
@@ -458,6 +479,12 @@ dlmmap (void *start, size_t length, int prot,
printf ("mapping in %zi\n", length);
#endif
if (execfd == -1 && is_emutramp_enabled ())
{
ptr = mmap (start, length, prot & ~PROT_EXEC, flags, fd, offset);
return ptr;
}
if (execfd == -1 && !is_selinux_enabled ())
{
ptr = mmap (start, length, prot | PROT_EXEC, flags, fd, offset);