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objtool/x86: allow syscall instruction

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The syscall instruction is used in Xen PV mode for doing hypercalls.
Allow syscall to be used in the kernel in case it is tagged with an
unwind hint for objtool.

This is part of XSA-466 / CVE-2024-53241.

Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Co-developed-by: Peter Zijlstra <peterz@infradead.org>
This commit is contained in:
Juergen Gross 2024-11-29 15:47:49 +01:00
parent efbcd61d9b
commit dda014ba59
1 changed files with 6 additions and 3 deletions
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9
tools/objtool/check.c
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@ -3820,9 +3820,12 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
break;
case INSN_CONTEXT_SWITCH:
if (func && (!next_insn || !next_insn->hint)) {
WARN_INSN(insn, "unsupported instruction in callable function");
return 1;
if (func) {
if (!next_insn || !next_insn->hint) {
WARN_INSN(insn, "unsupported instruction in callable function");
return 1;
}
break;
}
return 0;