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| author | Ulrich Drepper <drepper@redhat.com> | 2004-03-27 03:40:33 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2004-03-27 03:40:33 +0000 |
| commit | eec8b6cae586451deadf30c371f7b5e4c9d573d1 (patch) | |
| tree | b005437b5b7d69778e06694e4bd836a3e7c42f6a /sysdeps/unix/sysv/linux/dl-execstack.c | |
| parent | 17c263876bf38178d3a4ba720bf81d7a214bba51 (diff) | |
| download | glibc-eec8b6cae586451deadf30c371f7b5e4c9d573d1.tar.gz glibc-eec8b6cae586451deadf30c371f7b5e4c9d573d1.tar.xz glibc-eec8b6cae586451deadf30c371f7b5e4c9d573d1.zip | |
Update.
2004-03-26 Ulrich Drepper <drepper@redhat.com> * elf/dl-caller.c: New file. * include/caller.h: New file. * Makefile (distribute): Add include/caller.h. * elf/Makefile (dl-routines): Add dl-caller. * elf/dl-load.c (_dl_map_object_from_fd): Record l_text_end. * elf/dl-open.c (check_libc_caller): Removed. (dl_open_worker): Use __check_caller instead. * elf/rtld.c (_rtld_global_ro): Initialize _dl_check_caller. (_dl_start_final): Record l_text_end for ld.so map. (dl_main): Record l_text_end for main object and vdso. * include/link.h (struct link_map): Add l_text_end field. * sysdeps/generic/ldsodefs.h (struct rtld_global_ro): Add _dl_check_caller field. Define enum allowmask. Add declaration of _dl_check_caller. * sysdeps/unix/sysv/linux/dl-execstack.c: Also use __check_caller test.
Diffstat (limited to 'sysdeps/unix/sysv/linux/dl-execstack.c')
| -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; |