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objtool: Add straight-line-speculation validation

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Teach objtool to validate the straight-line-speculation constraints:

 - speculation trap after indirect calls
 - speculation trap after RET

Notable: when an instruction is annotated RETPOLINE_SAFE, indicating
  speculation isn't a problem, also don't care about sls for that
  instruction.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211204134908.023037659@infradead.org
This commit is contained in:
Peter Zijlstra
2021-12-04 14:43:42 +01:00
committed by Borislav Petkov
parent b17c2baa30
commit 1cc1e4c8aa
5 changed files with 27 additions and 6 deletions
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1
tools/objtool/include/objtool/arch.h
View File

@@ -26,6 +26,7 @@ enum insn_type {
INSN_CLAC,
INSN_STD,
INSN_CLD,
INSN_TRAP,
INSN_OTHER,
};

2
tools/objtool/include/objtool/builtin.h
View File

@@ -9,7 +9,7 @@
extern const struct option check_options[];
extern bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
validate_dup, vmlinux, mcount, noinstr, backup;
validate_dup, vmlinux, mcount, noinstr, backup, sls;
extern int cmd_parse_options(int argc, const char **argv, const char * const usage[]);