From e43358c5c81a6b7be8d55af6d736e05aa3d8ceb7 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Wed, 10 Oct 2007 03:22:30 -0700 Subject: [PATCH] Fix sys_ipc() SEMCTL on sparc64. changeset 6536a6b331d3225921c398eb7c6e4ecedb9b05e0 from mainline Thanks to Tom Callaway for the excellent bug report and test case. sys_ipc() has several problems, most to due with semaphore call handling: 1) 'err' return should be a 'long' 2) "union semun" is passed in a register on 64-bit compared to 32-bit which provides it on the stack and therefore by reference 3) Second and third arguments to SEMCTL are swapped compared to 32-bit. Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- arch/sparc64/kernel/sys_sparc.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-) diff --git a/arch/sparc64/kernel/sys_sparc.c b/arch/sparc64/kernel/sys_sparc.c index d108eeb0734f..0d5c50264945 100644 --- a/arch/sparc64/kernel/sys_sparc.c +++ b/arch/sparc64/kernel/sys_sparc.c @@ -436,7 +436,7 @@ out: asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second, unsigned long third, void __user *ptr, long fifth) { - int err; + long err; /* No need for backward compatibility. We can start fresh... */ if (call <= SEMCTL) { @@ -453,16 +453,9 @@ asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second, err = sys_semget(first, (int)second, (int)third); goto out; case SEMCTL: { - union semun fourth; - err = -EINVAL; - if (!ptr) - goto out; - err = -EFAULT; - if (get_user(fourth.__pad, - (void __user * __user *) ptr)) - goto out; - err = sys_semctl(first, (int)second | IPC_64, - (int)third, fourth); + err = sys_semctl(first, third, + (int)second | IPC_64, + (union semun) ptr); goto out; } default: -- 2.11.4.GIT