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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2020-04-29 11:49:20 +0100 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2020-07-08 15:02:38 +0100 |
| commit | 1be3d6eb823d8b952fa54b7bbc90cbecb8981380 (patch) | |
| tree | 4791e16bdb376f2a47f1e307d0316f7687cdd8e7 /sysdeps/aarch64/dl-trampoline.S | |
| parent | 9e1751e6d693b73b95db2f6d8438dd80f1aeffe0 (diff) | |
| download | glibc-1be3d6eb823d8b952fa54b7bbc90cbecb8981380.tar.gz glibc-1be3d6eb823d8b952fa54b7bbc90cbecb8981380.tar.xz glibc-1be3d6eb823d8b952fa54b7bbc90cbecb8981380.zip | |
aarch64: Add pac-ret support to assembly files
Use return address signing in assembly files for functions that save LR when pac-ret is enabled in the compiler. The GNU property note for PAC-RET is not meaningful to the dynamic linker so it is not strictly required, but it may be used to track the security property of binaries. (The PAC-RET property is only set if BTI is set too because BTI implies working GNU property support.) Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps/aarch64/dl-trampoline.S')
| -rw-r--r-- | sysdeps/aarch64/dl-trampoline.S | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/sysdeps/aarch64/dl-trampoline.S b/sysdeps/aarch64/dl-trampoline.S index 2cbfa81434..794876fffa 100644 --- a/sysdeps/aarch64/dl-trampoline.S +++ b/sysdeps/aarch64/dl-trampoline.S @@ -127,7 +127,12 @@ _dl_runtime_resolve: cfi_startproc .align 2 _dl_runtime_profile: +# if HAVE_AARCH64_PAC_RET + PACIASP + cfi_window_save +# else BTI_C +# endif /* AArch64 we get called with: ip0 &PLTGOT[2] ip1 temp(dl resolver entry point) @@ -239,8 +244,17 @@ _dl_runtime_profile: cfi_restore(x29) cfi_restore(x30) +# if HAVE_AARCH64_PAC_RET + add sp, sp, SF_SIZE + cfi_adjust_cfa_offset (-SF_SIZE) + AUTIASP + cfi_window_save + add sp, sp, 16 + cfi_adjust_cfa_offset (-16) +# else add sp, sp, SF_SIZE + 16 cfi_adjust_cfa_offset (- SF_SIZE - 16) +# endif /* Jump to the newly found address. */ br ip0 @@ -287,6 +301,10 @@ _dl_runtime_profile: /* LR from within La_aarch64_reg */ ldr lr, [x29, #OFFSET_RG + DL_OFFSET_RG_LR] cfi_restore(lr) +# if HAVE_AARCH64_PAC_RET + /* Note: LR restored from La_aarch64_reg has no PAC. */ + cfi_window_save +# endif mov sp, x29 cfi_def_cfa_register (sp) ldr x29, [x29, #0] |