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x86/syscalls: Disallow compat entries for all types of 64-bit syscalls

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A "compat" entry in the syscall tables means to use a different entry on
32-bit and 64-bit builds.

This only makes sense for syscalls that exist in the first place in 32-bit
builds, so disallow it for anything other than i386.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/4b7565954c5a06530ac01d98cb1592538fd8ae51.1562185330.git.luto@kernel.org
This commit is contained in:
Andy Lutomirski 2019-07-03 13:34:03 -07:00 committed by Thomas Gleixner
parent a8d03c3f30
commit f85a8573ce
1 changed files with 2 additions and 2 deletions
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4
arch/x86/entry/syscalls/syscalltbl.sh
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@ -27,8 +27,8 @@ emit() {
compat="$4"
umlentry=""
if [ "$abi" = "64" -a -n "$compat" ]; then
echo "a compat entry for a 64-bit syscall makes no sense" >&2
if [ "$abi" != "I386" -a -n "$compat" ]; then
echo "a compat entry ($abi: $compat) for a 64-bit syscall makes no sense" >&2
exit 1
fi