This is a note to let you know that I've just added the patch titled x86: Undo return-thunk damage to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-undo-return-thunk-damage.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Tue Jul 12 05:07:35 PM CEST 2022 From: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Date: Tue, 14 Jun 2022 23:15:37 +0200 Subject: x86: Undo return-thunk damage From: Peter Zijlstra <peterz@xxxxxxxxxxxxx> commit 15e67227c49a57837108acfe1c80570e1bd9f962 upstream. Introduce X86_FEATURE_RETHUNK for those afflicted with needing this. [ bp: Do only INT3 padding - simpler. ] Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Reviewed-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> [cascardo: CONFIG_STACK_VALIDATION vs CONFIG_OBJTOOL] [cascardo: no IBT support] Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/include/asm/alternative.h | 1 arch/x86/include/asm/cpufeatures.h | 1 arch/x86/include/asm/disabled-features.h | 3 + arch/x86/kernel/alternative.c | 60 +++++++++++++++++++++++++++++++ arch/x86/kernel/module.c | 8 +++- arch/x86/kernel/vmlinux.lds.S | 7 +++ 6 files changed, 78 insertions(+), 2 deletions(-) --- a/arch/x86/include/asm/alternative.h +++ b/arch/x86/include/asm/alternative.h @@ -76,6 +76,7 @@ extern int alternatives_patched; extern void alternative_instructions(void); extern void apply_alternatives(struct alt_instr *start, struct alt_instr *end); extern void apply_retpolines(s32 *start, s32 *end); +extern void apply_returns(s32 *start, s32 *end); struct module; --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -296,6 +296,7 @@ /* FREE! (11*32+11) */ #define X86_FEATURE_RETPOLINE (11*32+12) /* "" Generic Retpoline mitigation for Spectre variant 2 */ #define X86_FEATURE_RETPOLINE_LFENCE (11*32+13) /* "" Use LFENCE for Spectre variant 2 */ +#define X86_FEATURE_RETHUNK (11*32+14) /* "" Use REturn THUNK */ /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */ #define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* AVX512 BFLOAT16 instructions */ --- a/arch/x86/include/asm/disabled-features.h +++ b/arch/x86/include/asm/disabled-features.h @@ -60,7 +60,8 @@ # define DISABLE_RETPOLINE 0 #else # define DISABLE_RETPOLINE ((1 << (X86_FEATURE_RETPOLINE & 31)) | \ - (1 << (X86_FEATURE_RETPOLINE_LFENCE & 31))) + (1 << (X86_FEATURE_RETPOLINE_LFENCE & 31)) | \ + (1 << (X86_FEATURE_RETHUNK & 31))) #endif /* Force disable because it's broken beyond repair */ --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -270,6 +270,7 @@ static void __init_or_module add_nops(vo } extern s32 __retpoline_sites[], __retpoline_sites_end[]; +extern s32 __return_sites[], __return_sites_end[]; extern struct alt_instr __alt_instructions[], __alt_instructions_end[]; extern s32 __smp_locks[], __smp_locks_end[]; void text_poke_early(void *addr, const void *opcode, size_t len); @@ -661,9 +662,67 @@ void __init_or_module noinline apply_ret } } +/* + * Rewrite the compiler generated return thunk tail-calls. + * + * For example, convert: + * + * JMP __x86_return_thunk + * + * into: + * + * RET + */ +static int patch_return(void *addr, struct insn *insn, u8 *bytes) +{ + int i = 0; + + if (cpu_feature_enabled(X86_FEATURE_RETHUNK)) + return -1; + + bytes[i++] = RET_INSN_OPCODE; + + for (; i < insn->length;) + bytes[i++] = INT3_INSN_OPCODE; + + return i; +} + +void __init_or_module noinline apply_returns(s32 *start, s32 *end) +{ + s32 *s; + + for (s = start; s < end; s++) { + void *addr = (void *)s + *s; + struct insn insn; + int len, ret; + u8 bytes[16]; + u8 op1; + + ret = insn_decode_kernel(&insn, addr); + if (WARN_ON_ONCE(ret < 0)) + continue; + + op1 = insn.opcode.bytes[0]; + if (WARN_ON_ONCE(op1 != JMP32_INSN_OPCODE)) + continue; + + DPRINTK("return thunk at: %pS (%px) len: %d to: %pS", + addr, addr, insn.length, + addr + insn.length + insn.immediate.value); + + len = patch_return(addr, &insn, bytes); + if (len == insn.length) { + DUMP_BYTES(((u8*)addr), len, "%px: orig: ", addr); + DUMP_BYTES(((u8*)bytes), len, "%px: repl: ", addr); + text_poke_early(addr, bytes, len); + } + } +} #else /* !RETPOLINES || !CONFIG_STACK_VALIDATION */ void __init_or_module noinline apply_retpolines(s32 *start, s32 *end) { } +void __init_or_module noinline apply_returns(s32 *start, s32 *end) { } #endif /* CONFIG_RETPOLINE && CONFIG_STACK_VALIDATION */ @@ -956,6 +1015,7 @@ void __init alternative_instructions(voi * those can rewrite the retpoline thunks. */ apply_retpolines(__retpoline_sites, __retpoline_sites_end); + apply_returns(__return_sites, __return_sites_end); apply_alternatives(__alt_instructions, __alt_instructions_end); --- a/arch/x86/kernel/module.c +++ b/arch/x86/kernel/module.c @@ -252,7 +252,7 @@ int module_finalize(const Elf_Ehdr *hdr, { const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL, *para = NULL, *orc = NULL, *orc_ip = NULL, - *retpolines = NULL; + *retpolines = NULL, *returns = NULL; char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { @@ -270,12 +270,18 @@ int module_finalize(const Elf_Ehdr *hdr, orc_ip = s; if (!strcmp(".retpoline_sites", secstrings + s->sh_name)) retpolines = s; + if (!strcmp(".return_sites", secstrings + s->sh_name)) + returns = s; } if (retpolines) { void *rseg = (void *)retpolines->sh_addr; apply_retpolines(rseg, rseg + retpolines->sh_size); } + if (returns) { + void *rseg = (void *)returns->sh_addr; + apply_returns(rseg, rseg + returns->sh_size); + } if (alt) { /* patch .altinstructions */ void *aseg = (void *)alt->sh_addr; --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -284,6 +284,13 @@ SECTIONS *(.retpoline_sites) __retpoline_sites_end = .; } + + . = ALIGN(8); + .return_sites : AT(ADDR(.return_sites) - LOAD_OFFSET) { + __return_sites = .; + *(.return_sites) + __return_sites_end = .; + } #endif /* Patches currently in stable-queue which might be from peterz@xxxxxxxxxxxxx are queue-5.10/objtool-cache-instruction-relocs.patch queue-5.10/x86-sev-avoid-using-__x86_return_thunk.patch queue-5.10/objtool-add-elf_create_undef_symbol.patch queue-5.10/x86-ftrace-use-alternative-ret-encoding.patch queue-5.10/objtool-re-add-unwind_hint_-save_restore.patch queue-5.10/x86-bugs-add-retbleed-ibpb.patch queue-5.10/x86-bugs-enable-stibp-for-jmp2ret.patch queue-5.10/x86-retpoline-cleanup-some-ifdefery.patch queue-5.10/objtool-handle-__sanitize_cov-tail-calls.patch queue-5.10/x86-prepare-asm-files-for-straight-line-speculation.patch queue-5.10/kvm-vmx-flatten-__vmx_vcpu_run.patch queue-5.10/x86-kvm-vmx-make-noinstr-clean.patch queue-5.10/objtool-x86-replace-alternatives-with-.retpoline_sites.patch queue-5.10/objtool-skip-magical-retpoline-.altinstr_replacement.patch queue-5.10/x86-retbleed-add-fine-grained-kconfig-knobs.patch queue-5.10/x86-cpu-amd-add-spectral-chicken.patch queue-5.10/objtool-add-straight-line-speculation-validation.patch queue-5.10/kvm-vmx-fix-ibrs-handling-after-vmexit.patch queue-5.10/kvm-vmx-prevent-guest-rsb-poisoning-attacks-with-eibrs.patch queue-5.10/x86-vsyscall_emu-64-don-t-use-ret-in-vsyscall-emulation.patch queue-5.10/tools-arch-update-arch-x86-lib-mem-cpy-set-_64.s-copies-used-in-perf-bench-mem-memcpy.patch queue-5.10/x86-add-straight-line-speculation-mitigation.patch queue-5.10/x86-add-magic-amd-return-thunk.patch queue-5.10/x86-bugs-keep-a-per-cpu-ia32_spec_ctrl-value.patch queue-5.10/x86-alternatives-optimize-optimize_nops.patch queue-5.10/x86-objtool-create-.return_sites.patch queue-5.10/crypto-x86-poly1305-fixup-sls.patch queue-5.10/x86-alternative-handle-jcc-__x86_indirect_thunk_-reg.patch queue-5.10/x86-kvm-fix-setcc-emulation-for-return-thunks.patch queue-5.10/objtool-fix-objtool-regression-on-x32-systems.patch queue-5.10/x86-alternative-relax-text_poke_bp-constraint.patch queue-5.10/x86-retpoline-swizzle-retpoline-thunk.patch queue-5.10/objtool-rework-the-elf_rebuild_reloc_section-logic.patch queue-5.10/x86-speculation-fix-firmware-entry-spec_ctrl-handling.patch queue-5.10/x86-retpoline-remove-unused-replacement-symbols.patch queue-5.10/objtool-fix-symbol-creation.patch queue-5.10/x86-speculation-add-spectre_v2-ibrs-option-to-support-kernel-ibrs.patch queue-5.10/bpf-x86-respect-x86_feature_retpoline.patch queue-5.10/objtool-fix-type-of-reloc-addend.patch queue-5.10/objtool-x86-rewrite-retpoline-thunk-calls.patch queue-5.10/x86-undo-return-thunk-damage.patch queue-5.10/x86-prepare-inline-asm-for-straight-line-speculation.patch queue-5.10/x86-alternative-support-alternative_ternary.patch queue-5.10/kvm-emulate-fix-setcc-emulation-function-offsets-with-sls.patch queue-5.10/objtool-handle-per-arch-retpoline-naming.patch queue-5.10/x86-retpoline-create-a-retpoline-thunk-array.patch queue-5.10/x86-retpoline-simplify-retpolines.patch queue-5.10/x86-asm-fix-register-order.patch queue-5.10/x86-speculation-fill-rsb-on-vmexit-for-ibrs.patch queue-5.10/objtool-add-entry-unret-validation.patch queue-5.10/objtool-keep-track-of-retpoline-call-sites.patch queue-5.10/kvm-vmx-convert-launched-argument-to-flags.patch queue-5.10/objtool-add-elf_create_reloc-helper.patch queue-5.10/objtool-make-.altinstructions-section-entry-size-consistent.patch queue-5.10/x86-bpf-use-alternative-ret-encoding.patch queue-5.10/x86-common-stamp-out-the-stepping-madness.patch queue-5.10/x86-bugs-split-spectre_v2_select_mitigation-and-spectre_v2_user_select_mitigation.patch queue-5.10/x86-bugs-report-intel-retbleed-vulnerability.patch queue-5.10/bpf-x86-simplify-computing-label-offsets.patch queue-5.10/x86-cpufeatures-move-retpoline-flags-to-word-11.patch queue-5.10/x86-speculation-fix-spec_ctrl-write-on-smt-state-change.patch queue-5.10/x86-retpoline-use-mfunction-return.patch queue-5.10/x86-xen-rename-sys-entry-points.patch queue-5.10/objtool-only-rewrite-unconditional-retpoline-thunk-calls.patch queue-5.10/x86-bugs-optimize-spec_ctrl-msr-writes.patch queue-5.10/x86-alternative-optimize-single-byte-nops-at-an-arbitrary-position.patch queue-5.10/objtool-fix-code-relocs-vs-weak-symbols.patch queue-5.10/x86-bugs-report-amd-retbleed-vulnerability.patch queue-5.10/x86-static_call-use-alternative-ret-encoding.patch queue-5.10/x86-speculation-fix-rsb-filling-with-config_retpoline-n.patch queue-5.10/x86-asm-fixup-odd-gen-for-each-reg.h-usage.patch queue-5.10/x86-alternative-add-debug-prints-to-apply_retpolines.patch queue-5.10/objtool-extract-elf_symbol_add.patch queue-5.10/x86-use-return-thunk-in-asm-code.patch queue-5.10/objtool-remove-reloc-symbol-type-checks-in-get_alt_entry.patch queue-5.10/objtool-classify-symbols.patch queue-5.10/intel_idle-disable-ibrs-during-long-idle.patch queue-5.10/objtool-correctly-handle-retpoline-thunk-calls.patch queue-5.10/objtool-fix-.symtab_shndx-handling-for-elf_create_undef_symbol.patch queue-5.10/x86-retpoline-move-the-retpoline-thunk-declarations-to-nospec-branch.h.patch queue-5.10/objtool-support-asm-jump-tables.patch queue-5.10/x86-alternative-implement-.retpoline_sites-support.patch queue-5.10/objtool-x86-ignore-__x86_indirect_alt_-symbols.patch queue-5.10/objtool-fix-sls-validation-for-kcov-tail-call-replacement.patch queue-5.10/x86-alternative-try-inline-spectre_v2-retpoline-amd.patch queue-5.10/x86-entry-remove-skip_r11rcx.patch queue-5.10/objtool-explicitly-avoid-self-modifying-code-in-.altinstr_replacement.patch queue-5.10/x86-speculation-use-cached-host-spec_ctrl-value-for-guest-entry-exit.patch queue-5.10/x86-bugs-add-amd-retbleed-boot-parameter.patch queue-5.10/objtool-create-reloc-sections-implicitly.patch queue-5.10/x86-entry-add-kernel-ibrs-implementation.patch queue-5.10/objtool-treat-.text.__x86.-as-noinstr.patch queue-5.10/x86-lib-atomic64_386_32-rename-things.patch queue-5.10/objtool-introduce-cfi-hash.patch queue-5.10/objtool-default-ignore-int3-for-unreachable.patch queue-5.10/objtool-extract-elf_strtab_concat.patch queue-5.10/objtool-teach-get_alt_entry-about-more-relocation-types.patch queue-5.10/objtool-update-retpoline-validation.patch