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authorRoland McGrath <roland@gnu.org>2003-09-23 12:07:26 +0000
committerRoland McGrath <roland@gnu.org>2003-09-23 12:07:26 +0000
commit2abf9ff11384a47dc456c138a8faf6b1469aac2b (patch)
treed0ccba6b9bf3096c8d1d2d209984bf4d28597408 /sysdeps/i386
parentecdeaac05f73c29eca92eecd55ad4fb8513c7771 (diff)
downloadglibc-2abf9ff11384a47dc456c138a8faf6b1469aac2b.tar.gz
* sysdeps/i386/dl-machine.h (RTLD_START): Set __libc_stack_end before
calling _dl_start, using GOTOFF access. * configure.in (libc_cv_z_execstack): New check. * configure: Regenerated. * config.make.in (have-z-execstack): New variable set by it. * elf/tst-execstack.c: New file. * elf/tst-execstack-mod.c: New file. * elf/tst-execstack-needed.c: New file. * elf/Makefile (tests-execstack-yes, modules-execstack-yes): New variables. (tests, modules-names): Conditionally include them. (distribute): Add tst-execstack-mod.c here. ($(objpfx)tst-execstack, $(objpfx)tst-execstack.out): New targets. (LDFLAGS-tst-execstack, LDFLAGS-tst-execstack-mod): New variables. ($(objpfx)tst-execstack-needed): New target. (LDFLAGS-tst-execstack-needed): New variable. * sysdeps/generic/ldsodefs.h (struct rtld_global): Add _dl_stack_flags and _dl_make_stack_executable_hook. Declare _dl_make_stack_executable. * elf/rtld.c (_rtld_global): Add initializer for _dl_stack_flags. (dl_main): Reset _dl_stack_flags according to PT_GNU_STACK phdr. Initialize _dl_make_stack_executable_hook. * elf/dl-support.c: Define those new variables. (_dl_non_dynamic_init): Scan phdrs for PT_GNU_STACK. (_dl_phdr): Fix type. * elf/dl-load.c (_dl_map_object_from_fd): Grok PT_GNU_STACK phdr and enable execute permission for the stack if necessary. * sysdeps/generic/dl-execstack.c: New file. * elf/Makefile (dl-routines): Add it. * elf/Versions (ld: GLIBC_PRIVATE): Add _dl_make_stack_executable. * sysdeps/unix/sysv/linux/dl-execstack.c: New file.
Diffstat (limited to 'sysdeps/i386')
-rw-r--r--sysdeps/i386/dl-machine.h11
1 files changed, 5 insertions, 6 deletions
diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h
index 34019b89bb..9e84e2c059 100644
--- a/sysdeps/i386/dl-machine.h
+++ b/sysdeps/i386/dl-machine.h
@@ -276,18 +276,17 @@ _dl_runtime_profile:\n\
.globl _start\n\
.globl _dl_start_user\n\
_start:\n\
+ # Point %ebx at the GOT.\n\
+ call 0b\n\
+ addl $_GLOBAL_OFFSET_TABLE_, %ebx\n\
# Note that _dl_start gets the parameter in %eax.\n\
movl %esp, %eax\n\
+ # Store the highest stack address\n\
+ movl %eax, __libc_stack_end@GOTOFF(%ebx)\n\
call _dl_start\n\
_dl_start_user:\n\
# Save the user entry point address in %edi.\n\
movl %eax, %edi\n\
- # Point %ebx at the GOT.\n\
- call 0b\n\
- addl $_GLOBAL_OFFSET_TABLE_, %ebx\n\
- # Store the highest stack address\n\
- movl __libc_stack_end@GOT(%ebx), %eax\n\
- movl %esp, (%eax)\n\
# See if we were run as a command with the executable file\n\
# name as an extra leading argument.\n\
movl _dl_skip_args@GOTOFF(%ebx), %eax\n\