blob: 80cd0d1fad8cb439c0e328daadbf15934943cfd5 [file] [log] [blame]
From 94f5b9c6efb02966fc021d3429c80a5d62befbab Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@kernel.org>
Date: Wed, 3 Jul 2019 13:34:03 -0700
Subject: [PATCH] x86/syscalls: Disallow compat entries for all types of 64-bit
syscalls
commit f85a8573ceb225e606fcf38a9320782316f47c71 upstream.
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
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
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
--
2.7.4