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[3.14] gh-128605: Add branch protections for x86_64 in asm_trampoline.S (#128606) (#135077)

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Apply Intel Control-flow Technology for x86-64 on asm_trampoline.S.

Required for mitigation against return-oriented programming (ROP)
and Call or Jump Oriented Programming (COP/JOP) attacks.

Manual application is required for the assembly files.

See also: https://sourceware.org/annobin/annobin.html/Test-cf-protection.html
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stratakis 2025-06-03 15:31:06 +02:00 • committed by GitHub
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commit 899cca6dbf
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Python/perf_jit_trampoline.c
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@ -473,6 +473,11 @@ elf_init_ehframe(ELFObjectContext* ctx)
DWRF_U8(0); /* Augmentation data. */
/* Registers saved in CFRAME. */
#ifdef __x86_64__
# if defined(__CET__) && (__CET__ & 1)
DWRF_U8(DWRF_CFA_advance_loc | 8);
# else
DWRF_U8(DWRF_CFA_advance_loc | 4);
# endif
DWRF_U8(DWRF_CFA_advance_loc | 4);
DWRF_U8(DWRF_CFA_def_cfa_offset); DWRF_UV(16);
DWRF_U8(DWRF_CFA_advance_loc | 6);