5.10-stable review patch. If anyone has any objections, please let me know.
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From: Peter Zijlstra peterz@infradead.org
Upstream commit: bbf92368b0b1fe472d489e62d3340d7897e9c697
Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Acked-by: Josh Poimboeuf jpoimboe@redhat.com Link: https://lore.kernel.org/r/20220308154317.638561109@infradead.org Signed-off-by: Borislav Petkov (AMD) bp@alien8.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/include/asm/text-patching.h | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
--- a/arch/x86/include/asm/text-patching.h +++ b/arch/x86/include/asm/text-patching.h @@ -101,13 +101,21 @@ void *text_gen_insn(u8 opcode, const voi static union text_poke_insn insn; /* per instance */ int size = text_opcode_size(opcode);
+ /* + * Hide the addresses to avoid the compiler folding in constants when + * referencing code, these can mess up annotations like + * ANNOTATE_NOENDBR. + */ + OPTIMIZER_HIDE_VAR(addr); + OPTIMIZER_HIDE_VAR(dest); + insn.opcode = opcode;
if (size > 1) { insn.disp = (long)dest - (long)(addr + size); if (size == 2) { /* - * Ensure that for JMP9 the displacement + * Ensure that for JMP8 the displacement * actually fits the signed byte. */ BUG_ON((insn.disp >> 31) != (insn.disp >> 7));