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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-09-28 13:31:19 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-09-28 13:31:30 -0700 |
| commit | 7b1f9406761331cf35fe521fbdb592beecf68a2c (patch) | |
| tree | 33dd97f1e788774cc9ec32fe443b5046d80e8349 /sysdeps/i386/dl-machine.h | |
| parent | 7a16bdbb9ff4122af0a28dc20996c95352011fdd (diff) | |
| download | glibc-7b1f9406761331cf35fe521fbdb592beecf68a2c.zip glibc-7b1f9406761331cf35fe521fbdb592beecf68a2c.tar.gz glibc-7b1f9406761331cf35fe521fbdb592beecf68a2c.tar.bz2 | |
i386: Use _dl_runtime_[resolve|profile]_shstk for SHSTK [BZ #23716]
When elf_machine_runtime_setup is called to set up resolver, it should
use _dl_runtime_resolve_shstk or _dl_runtime_profile_shstk if SHSTK is
enabled by kernel.
Tested on i686 with and without --enable-cet as well as on CET emulator
with --enable-cet.
[BZ #23716]
* sysdeps/i386/dl-cet.c: Removed.
* sysdeps/i386/dl-machine.h (_dl_runtime_resolve_shstk): New
prototype.
(_dl_runtime_profile_shstk): Likewise.
(elf_machine_runtime_setup): Use _dl_runtime_profile_shstk or
_dl_runtime_resolve_shstk if SHSTK is enabled by kernel.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Diffstat (limited to 'sysdeps/i386/dl-machine.h')
| -rw-r--r-- | sysdeps/i386/dl-machine.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h index 1afdcbd..f6cfb90 100644 --- a/sysdeps/i386/dl-machine.h +++ b/sysdeps/i386/dl-machine.h @@ -67,6 +67,11 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) Elf32_Addr *got; extern void _dl_runtime_resolve (Elf32_Word) attribute_hidden; extern void _dl_runtime_profile (Elf32_Word) attribute_hidden; + extern void _dl_runtime_resolve_shstk (Elf32_Word) attribute_hidden; + extern void _dl_runtime_profile_shstk (Elf32_Word) attribute_hidden; + /* Check if SHSTK is enabled by kernel. */ + bool shstk_enabled + = (GL(dl_x86_feature_1)[0] & GNU_PROPERTY_X86_FEATURE_1_SHSTK) != 0; if (l->l_info[DT_JMPREL] && lazy) { @@ -93,7 +98,9 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) end in this function. */ if (__glibc_unlikely (profile)) { - got[2] = (Elf32_Addr) &_dl_runtime_profile; + got[2] = (shstk_enabled + ? (Elf32_Addr) &_dl_runtime_profile_shstk + : (Elf32_Addr) &_dl_runtime_profile); if (GLRO(dl_profile) != NULL && _dl_name_match_p (GLRO(dl_profile), l)) @@ -104,7 +111,9 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) else /* This function will get called to fix up the GOT entry indicated by the offset on the stack, and then jump to the resolved address. */ - got[2] = (Elf32_Addr) &_dl_runtime_resolve; + got[2] = (shstk_enabled + ? (Elf32_Addr) &_dl_runtime_resolve_shstk + : (Elf32_Addr) &_dl_runtime_resolve); } return lazy; |