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Subject[PATCH 2/4] x86/syscalls: Disallow compat entries for all types of 64-bit syscalls
Date
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>
---
arch/x86/entry/syscalls/syscalltbl.sh | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/entry/syscalls/syscalltbl.sh b/arch/x86/entry/syscalls/syscalltbl.sh
index 94fcd1951aca..53c8c1a9adf9 100644
--- a/arch/x86/entry/syscalls/syscalltbl.sh
+++ b/arch/x86/entry/syscalls/syscalltbl.sh
@@ -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

--
2.21.0
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