diff options
Diffstat (limited to 'sysdeps/unix/sysv')
| -rw-r--r-- | sysdeps/unix/sysv/linux/dl-execstack.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/sysdeps/unix/sysv/linux/dl-execstack.c b/sysdeps/unix/sysv/linux/dl-execstack.c index d3b048192c..248196040a 100644 --- a/sysdeps/unix/sysv/linux/dl-execstack.c +++ b/sysdeps/unix/sysv/linux/dl-execstack.c @@ -20,8 +20,10 @@ #include <ldsodefs.h> #include <sys/mman.h> #include <errno.h> +#include <libintl.h> #include <stdbool.h> #include <stackinfo.h> +#include <caller.h> #include "kernel-features.h" @@ -31,13 +33,14 @@ internal_function _dl_make_stack_executable (void **stack_endp) { /* This gives us the highest/lowest page that needs to be changed. */ - uintptr_t page = ((uintptr_t) __libc_stack_end + uintptr_t page = ((uintptr_t) *stack_endp & -(intptr_t) GLRO(dl_pagesize)); /* Challenge the caller. */ - if (__builtin_expect (*stack_endp != __libc_stack_end, 0)) + if (__builtin_expect (__check_caller (__builtin_return_address (0), + allow_ldso|allow_libpthread) != 0, 0) + || __builtin_expect (*stack_endp != __libc_stack_end, 0)) return EPERM; - *stack_endp = NULL; #if _STACK_GROWS_DOWN /* Newer Linux kernels support a flag to make our job easy. */ @@ -151,6 +154,9 @@ _dl_make_stack_executable (void **stack_endp) #endif return_success: + /* Clear the address. */ + *stack_endp = NULL; + /* Remember that we changed the permission. */ GL(dl_stack_flags) |= PF_X; |