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| author | Ulrich Drepper <drepper@redhat.com> | 2004-01-13 20:18:20 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2004-01-13 20:18:20 +0000 |
| commit | 760bafc5aaf124e6eecc9ef0c10816b346270b7a (patch) | |
| tree | ac7d8cb552074e4e4c2e3901a5356a0a0f7a17ac /sysdeps/unix | |
| parent | d1fc817ea459ca28979948fbb23ff58a6f3f4a8c (diff) | |
| download | glibc-760bafc5aaf124e6eecc9ef0c10816b346270b7a.tar.gz glibc-760bafc5aaf124e6eecc9ef0c10816b346270b7a.tar.xz glibc-760bafc5aaf124e6eecc9ef0c10816b346270b7a.zip | |
(__libc_stack_end): Mark hidden. (_dl_make_stack_executable): Add one more __builtin_expect.
Diffstat (limited to 'sysdeps/unix')
| -rw-r--r-- | sysdeps/unix/sysv/linux/dl-execstack.c | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/sysdeps/unix/sysv/linux/dl-execstack.c b/sysdeps/unix/sysv/linux/dl-execstack.c index d93dc8585f..e96197a22e 100644 --- a/sysdeps/unix/sysv/linux/dl-execstack.c +++ b/sysdeps/unix/sysv/linux/dl-execstack.c @@ -26,21 +26,21 @@ #include "kernel-features.h" -extern void *__libc_stack_end; +extern void *__libc_stack_end attribute_hidden; int 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 & -(intptr_t) GL(dl_pagesize); + /* Challenge the caller. */ - if (*stack_endp != __libc_stack_end) + if (__builtin_expect (*stack_endp != __libc_stack_end, 0)) return EPERM; *stack_endp = NULL; #if _STACK_GROWS_DOWN - /* This gives us the highest page that needs to be changed. */ - uintptr_t page = (uintptr_t) __libc_stack_end & -(intptr_t) GL(dl_pagesize); - /* Newer Linux kernels support a flag to make our job easy. */ # ifdef PROT_GROWSDOWN # if __ASSUME_PROT_GROWSUPDOWN == 0 @@ -48,8 +48,9 @@ _dl_make_stack_executable (void **stack_endp) if (! no_growsdown) # endif { - if (__mprotect ((void *) page, GL(dl_pagesize), - PROT_READ|PROT_WRITE|PROT_EXEC|PROT_GROWSDOWN) == 0) + if (__builtin_expect (__mprotect ((void *) page, GL(dl_pagesize), + PROT_READ|PROT_WRITE|PROT_EXEC + |PROT_GROWSDOWN) == 0, 1)) goto return_success; # if __ASSUME_PROT_GROWSUPDOWN == 0 if (errno == EINVAL) @@ -95,10 +96,6 @@ _dl_make_stack_executable (void **stack_endp) # endif #elif _STACK_GROWS_UP - - /* This gives us the lowest page that needs to be changed. */ - uintptr_t page = (uintptr_t) __libc_stack_end & -(intptr_t) GL(dl_pagesize); - /* Newer Linux kernels support a flag to make our job easy. */ # ifdef PROT_GROWSUP # if __ASSUME_PROT_GROWSUPDOWN == 0 |