From 883dae86d69153092f73a223f226c85fa4fb9a35 Mon Sep 17 00:00:00 2001 From: John David Anglin Date: Mon, 20 Feb 2017 20:31:57 -0500 Subject: hppa: Fix setting of __libc_stack_end The binutils package was recently changed to fix -z relro support on hppa. See ld/21000 for details: https://sourceware.org/bugzilla/show_bug.cgi?id=21000 This exposed a problem with the _dl_start_user function in the RTLD_START define. We need to set __libc_stack_end before it is made read only. For this, we need to define DL_STACK_END. The offset of 0x160 gives the same stack end as the code in _dl_start_user. A build log with the attached patch is here: https://buildd.debian.org/status/fetch.php?pkg=glibc&arch=hppa&ver=2.24-9&stamp=1487639205&raw=0 (cherry picked from commit 5d20a49aaccef5ef7adac93d5ca159f6b7ba0105) (cherry picked from commit 8b3caa41b9cb82651e72a0c87aa56719c134000e) --- sysdeps/hppa/dl-machine.h | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/sysdeps/hppa/dl-machine.h b/sysdeps/hppa/dl-machine.h index 339c7bb771..787b95f502 100644 --- a/sysdeps/hppa/dl-machine.h +++ b/sysdeps/hppa/dl-machine.h @@ -302,6 +302,10 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) #define ARCH_LA_PLTENTER hppa_gnu_pltenter #define ARCH_LA_PLTEXIT hppa_gnu_pltexit +/* Adjust DL_STACK_END to get value we want in __libc_stack_end. */ +#define DL_STACK_END(cookie) \ + ((void *) (((long) (cookie)) + 0x160)) + /* Initial entry point code for the dynamic linker. The C function `_dl_start' is the real entry point; its return value is the user program's entry point. */ @@ -401,11 +405,6 @@ asm ( \ /* Save the entry point in %r3. */ \ " copy %ret0,%r3\n" \ \ - /* Remember the lowest stack address. */ \ -" addil LT'__libc_stack_end,%r19\n" \ -" ldw RT'__libc_stack_end(%r1),%r20\n" \ -" stw %sp,0(%r20)\n" \ - \ /* See if we were called as a command with the executable file \ name as an extra leading argument. */ \ " addil LT'_dl_skip_args,%r19\n" \ -- cgit v1.2.3-65-gdbad