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| author | Will Newton <will.newton@linaro.org> | 2013-12-10 16:26:38 +0000 |
|---|---|---|
| committer | Will Newton <will.newton@linaro.org> | 2014-01-14 14:02:34 +0000 |
| commit | 2f10c4d6901e7a4c4ad294cc5bb8ece6547f4f62 (patch) | |
| tree | 9694325d2c26b777f46a0e6b68eedc818b731896 /ports/sysdeps/unix/sysv/linux/arm/sysdep.h | |
| parent | 497b1e69f9ad6d11341735d81b7c9181d168df90 (diff) | |
| download | glibc-2f10c4d6901e7a4c4ad294cc5bb8ece6547f4f62.tar.gz glibc-2f10c4d6901e7a4c4ad294cc5bb8ece6547f4f62.tar.xz glibc-2f10c4d6901e7a4c4ad294cc5bb8ece6547f4f62.zip | |
ARM: Don't apply pointer encryption to the frame pointer
The frame pointer register is rarely used for that purpose on ARM and applications that look at the contents of the jmp_buf may be relying on reading an unencrypted value. For example, Ruby uses the contents of jmp_buf to find the root set for garbage collection so relies on this pointer value being unencrypted. Without this patch the Ruby testsuite fails with a segmentation fault. ports/ChangeLog.arm: 2013-01-14 Will Newton <will.newton@linaro.org> * sysdeps/arm/__longjmp.S: Don't apply pointer encryption to fp register. * sysdeps/arm/setjmp.S: Likewise. * sysdeps/arm/include/bits/setjmp.h (JMP_BUF_REGLIST): Add fp to register list, remove a4. * sysdeps/unix/sysv/linux/arm/sysdep.h (PTR_MANGLE_LOAD): New macro.
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/arm/sysdep.h')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/arm/sysdep.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/arm/sysdep.h b/ports/sysdeps/unix/sysv/linux/arm/sysdep.h index 11d0a1146e..dcd99198cc 100644 --- a/ports/sysdeps/unix/sysv/linux/arm/sysdep.h +++ b/ports/sysdeps/unix/sysv/linux/arm/sysdep.h @@ -439,8 +439,10 @@ __local_syscall_error: \ #if (defined NOT_IN_libc && defined IS_IN_rtld) || \ (!defined SHARED && (!defined NOT_IN_libc || defined IS_IN_libpthread)) # ifdef __ASSEMBLER__ +# define PTR_MANGLE_LOAD(guard, tmp) \ + LDST_PCREL(ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard_local)); # define PTR_MANGLE(dst, src, guard, tmp) \ - LDST_PCREL(ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard_local)); \ + PTR_MANGLE_LOAD(guard, tmp); \ PTR_MANGLE2(dst, src, guard) /* Use PTR_MANGLE2 for efficiency if guard is already loaded. */ # define PTR_MANGLE2(dst, src, guard) \ @@ -457,8 +459,10 @@ extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden; # endif #else # ifdef __ASSEMBLER__ +# define PTR_MANGLE_LOAD(guard, tmp) \ + LDST_GLOBAL(ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard)); # define PTR_MANGLE(dst, src, guard, tmp) \ - LDST_GLOBAL(ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard)); \ + PTR_MANGLE_LOAD(guard, tmp); \ PTR_MANGLE2(dst, src, guard) /* Use PTR_MANGLE2 for efficiency if guard is already loaded. */ # define PTR_MANGLE2(dst, src, guard) \ |