[CVE-2009-0029] System call wrapper special cases

System calls with an unsigned long long argument can't be converted with
the standard wrappers since that would include a cast to long, which in
turn means that we would lose the upper 32 bit on 32 bit architectures.
Also semctl can't use the standard wrapper since it has a 'union'
parameter.

So we handle them as special case and add some extra wrappers instead.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/ipc/sem.c b/ipc/sem.c
index c68cd3f8f0c9..c385c40c061c 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -887,7 +887,7 @@ out_up:
         return err;
 }
 
-asmlinkage long sys_semctl (int semid, int semnum, int cmd, union semun arg)
+SYSCALL_DEFINE(semctl)(int semid, int semnum, int cmd, union semun arg)
 {
         int err = -EINVAL;
         int version;
@@ -923,6 +923,13 @@ asmlinkage long sys_semctl (int semid, int semnum, int cmd, union semun arg)
                 return -EINVAL;
         }
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_semctl(int semid, int semnum, int cmd, union semun arg)
+{
+        return SYSC_semctl((int) semid, (int) semnum, (int) cmd, arg);
+}
+SYSCALL_ALIAS(sys_semctl, SyS_semctl);
+#endif
 
 /* If the task doesn't already have a undo_list, then allocate one
  * here.  We guarantee there is only one thread using this undo list,