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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-12-19 02:43:50 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-12-19 02:44:04 -0800 |
| commit | f81ddabffd76ac9dd600b02adbf3e1dac4bb10ec (patch) | |
| tree | 7f9cac093b8e4d135be6ba830cd2bfe9a004131f /ChangeLog | |
| parent | 1a49fc59e42513247eaeac3feac6b099157eea7c (diff) | |
| download | glibc-f81ddabffd76ac9dd600b02adbf3e1dac4bb10ec.zip glibc-f81ddabffd76ac9dd600b02adbf3e1dac4bb10ec.tar.gz glibc-f81ddabffd76ac9dd600b02adbf3e1dac4bb10ec.tar.bz2 | |
Linux/x86: Update cancel_jmp_buf to match __jmp_buf_tag [BZ #22563]
On x86, padding in struct __jmp_buf_tag is used for shadow stack pointer
to support shadow stack in Intel Control-flow Enforcemen Technology.
Since the cancel_jmp_buf array is passed to setjmp and longjmp by
casting it to pointer to struct __jmp_buf_tag, it should be as large
as struct __jmp_buf_tag. Otherwise when shadow stack is enabled,
setjmp and longjmp will write and read beyond cancel_jmp_buf when saving
and restoring shadow stack pointer.
This patch adds bits/types/__cancel_jmp_buf_tag.h to define struct
__cancel_jmp_buf_tag so that Linux/x86 can add saved_mask to
cancel_jmp_buf.
Tested natively on i386, x86_64 and x32. Tested hppa-linux-gnu with
build-many-glibcs.py.
[BZ #22563]
* bits/types/__cancel_jmp_buf_tag.h: New file.
* sysdeps/unix/sysv/linux/x86/bits/types/__cancel_jmp_buf_tag.h
* sysdeps/unix/sysv/linux/x86/pthreaddef.h: Likewise.
* sysdeps/unix/sysv/linux/x86/nptl/pthreadP.h: Likewise.
* nptl/Makefile (headers): Add
bits/types/__cancel_jmp_buf_tag.h.
* nptl/descr.h [NEED_SAVED_MASK_IN_CANCEL_JMP_BUF]
(pthread_unwind_buf): Add saved_mask to cancel_jmp_buf.
* sysdeps/nptl/pthread.h: Include
<bits/types/__cancel_jmp_buf_tag.h>.
(__pthread_unwind_buf_t): Use struct __cancel_jmp_buf_tag with
__cancel_jmp_buf.
* sysdeps/unix/sysv/linux/hppa/pthread.h: Likewise.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 17 |
1 files changed, 17 insertions, 0 deletions
@@ -1,3 +1,20 @@ +2017-12-19 H.J. Lu <hongjiu.lu@intel.com> + + [BZ #22563] + * bits/types/__cancel_jmp_buf_tag.h: New file. + * sysdeps/unix/sysv/linux/x86/bits/types/__cancel_jmp_buf_tag.h + * sysdeps/unix/sysv/linux/x86/pthreaddef.h: Likewise. + * sysdeps/unix/sysv/linux/x86/nptl/pthreadP.h: Likewise. + * nptl/Makefile (headers): Add + bits/types/__cancel_jmp_buf_tag.h. + * nptl/descr.h [NEED_SAVED_MASK_IN_CANCEL_JMP_BUF] + (pthread_unwind_buf): Add saved_mask to cancel_jmp_buf. + * sysdeps/nptl/pthread.h: Include + <bits/types/__cancel_jmp_buf_tag.h>. + (__pthread_unwind_buf_t): Use struct __cancel_jmp_buf_tag with + __cancel_jmp_buf. + * sysdeps/unix/sysv/linux/hppa/pthread.h: Likewise. + 2017-12-18 H.J. Lu <hongjiu.lu@intel.com> * scripts/build-many-glibcs.py (Context.add_all_configs): Add |