linux-kernel - [PATCH 1/2] powerpc/syscalls: Use the number when building SPU syscall table

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 16 Jun 2020 23:56:16 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     linuxppc-dev@...abs.org
Cc:     arnd@...db.de, linux-arch@...abs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] powerpc/syscalls: Use the number when building SPU syscall table

Currently the macro that inserts entries into the SPU syscall table
doesn't actually use the "nr" (syscall number) parameter.

This does work, but it relies on the exact right number of syscall
entries being emitted in order for the syscal numbers to line up with
the array entries. If for example we had two entries with the same
syscall number we wouldn't get an error, it would just cause all
subsequent syscalls to be off by one in the spu_syscall_table.

So instead change the macro to assign to the specific entry of the
array, meaning any numbering overlap will be caught by the compiler.

Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Acked-by: Arnd Bergmann <arnd@...db.de>
Link: https://lore.kernel.org/r/20190116132714.20094-1-mpe@ellerman.id.au
---
 arch/powerpc/platforms/cell/spu_callbacks.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/cell/spu_callbacks.c b/arch/powerpc/platforms/cell/spu_callbacks.c
index cbee3666da07..abdef9bcf432 100644
--- a/arch/powerpc/platforms/cell/spu_callbacks.c
+++ b/arch/powerpc/platforms/cell/spu_callbacks.c
@@ -35,7 +35,7 @@
  */

 static void *spu_syscall_table[] = {
-#define __SYSCALL(nr, entry)	entry,
+#define __SYSCALL(nr, entry) [nr] = entry,
 #include <asm/syscall_table_spu.h>
 #undef __SYSCALL
 };
-- 
2.25.1