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objtool/x86: allow syscall instruction

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commit dda014ba59331dee4f3b773a020e109932f4bd24 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Juergen Gross 2024-11-29 15:47:49 +01:00 committed by Greg Kroah-Hartman
parent 8f2c179b1d
commit 1c50e8da50
1 changed files with 7 additions and 4 deletions
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11
tools/objtool/check.c
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@ -3206,10 +3206,13 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
break;
case INSN_CONTEXT_SWITCH:
if (func && (!next_insn || !next_insn->hint)) {
WARN_FUNC("unsupported instruction in callable function",
sec, insn->offset);
return 1;
if (func) {
if (!next_insn || !next_insn->hint) {
WARN_FUNC("unsupported instruction in callable function",
sec, insn->offset);
return 1;
}
break;
}
return 0;