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Commit f85a8573 authored by Andy Lutomirski's avatar Andy Lutomirski Committed by Thomas Gleixner
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x86/syscalls: Disallow compat entries for all types of 64-bit syscalls 



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: default avatarAndy Lutomirski <luto@kernel.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/4b7565954c5a06530ac01d98cb1592538fd8ae51.1562185330.git.luto@kernel.org
parent a8d03c3f

arch/x86/entry/syscalls/syscalltbl.sh

+2 −2
Original line number Diff line number Diff line
@@ -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