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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-01-05 10:36:40 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-01-09 13:55:51 -0300 |
| commit | 25f1e16ef03a6a8fb1701c4647d46c564480d88c (patch) | |
| tree | c4f2b8148ab0fe004bae19105d8f8169ab9922a7 /sysdeps/x86_64/sysdep.h | |
| parent | b7fc4a07f206a640e6d807d72f5c1ee3ea7a25b6 (diff) | |
| download | glibc-25f1e16ef03a6a8fb1701c4647d46c564480d88c.tar.gz glibc-25f1e16ef03a6a8fb1701c4647d46c564480d88c.tar.xz glibc-25f1e16ef03a6a8fb1701c4647d46c564480d88c.zip | |
i386: Remove CET support
CET is only support for x86_64, this patch reverts:
- faaee1f07ed x86: Support shadow stack pointer in setjmp/longjmp.
- be9ccd27c09 i386: Add _CET_ENDBR to indirect jump targets in
add_n.S/sub_n.S
- c02695d7764 x86/CET: Update vfork to prevent child return
- 5d844e1b725 i386: Enable CET support in ucontext functions
- 124bcde683 x86: Add _CET_ENDBR to functions in crti.S
- 562837c002 x86: Add _CET_ENDBR to functions in dl-tlsdesc.S
- f753fa7dea x86: Support IBT and SHSTK in Intel CET [BZ #21598]
- 825b58f3fb i386-mcount.S: Add _CET_ENDBR to _mcount and __fentry__
- 7e119cd582 i386: Use _CET_NOTRACK in i686/memcmp.S
- 177824e232 i386: Use _CET_NOTRACK in memcmp-sse4.S
- 0a899af097 i386: Use _CET_NOTRACK in memcpy-ssse3-rep.S
- 7fb613361c i386: Use _CET_NOTRACK in memcpy-ssse3.S
- 77a8ae0948 i386: Use _CET_NOTRACK in memset-sse2-rep.S
- 00e7b76a8f i386: Use _CET_NOTRACK in memset-sse2.S
- 90d15dc577 i386: Use _CET_NOTRACK in strcat-sse2.S
- f1574581c7 i386: Use _CET_NOTRACK in strcpy-sse2.S
- 4031d7484a i386/sub_n.S: Add a missing _CET_ENDBR to indirect jump
- target
-
Checked on i686-linux-gnu.
Diffstat (limited to 'sysdeps/x86_64/sysdep.h')
| -rw-r--r-- | sysdeps/x86_64/sysdep.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/sysdeps/x86_64/sysdep.h b/sysdeps/x86_64/sysdep.h index 3e7f4cbd8a..db6e36b2dd 100644 --- a/sysdeps/x86_64/sysdep.h +++ b/sysdeps/x86_64/sysdep.h @@ -22,10 +22,52 @@ #include <sysdeps/x86/sysdep.h> #include <x86-lp_size.h> +/* __CET__ is defined by GCC with Control-Flow Protection values: + +enum cf_protection_level +{ + CF_NONE = 0, + CF_BRANCH = 1 << 0, + CF_RETURN = 1 << 1, + CF_FULL = CF_BRANCH | CF_RETURN, + CF_SET = 1 << 2 +}; +*/ + +/* Set if CF_BRANCH (IBT) is enabled. */ +#define X86_FEATURE_1_IBT (1U << 0) +/* Set if CF_RETURN (SHSTK) is enabled. */ +#define X86_FEATURE_1_SHSTK (1U << 1) + +#ifdef __CET__ +# define CET_ENABLED 1 +# define SHSTK_ENABLED (__CET__ & X86_FEATURE_1_SHSTK) +#else +# define CET_ENABLED 0 +# define SHSTK_ENABLED 0 +#endif + #ifdef __ASSEMBLER__ /* Syntactic details of assembler. */ +#ifdef _CET_ENDBR +# define _CET_NOTRACK notrack +#else +# define _CET_ENDBR +# define _CET_NOTRACK +#endif + +/* Define an entry point visible from C. */ +#define ENTRY_P2ALIGN(name, alignment) \ + .globl C_SYMBOL_NAME(name); \ + .type C_SYMBOL_NAME(name),@function; \ + .align ALIGNARG(alignment); \ + C_LABEL(name) \ + cfi_startproc; \ + _CET_ENDBR; \ + CALL_MCOUNT + /* This macro is for setting proper CFI with DW_CFA_expression describing the register as saved relative to %rsp instead of relative to the CFA. Expression is DW_OP_drop, DW_OP_breg7 (%rsp is register 7), sleb128 offset |