[tip: locking/core] [parisc, s390, sparc64] no need for access_ok() in futex handling

[tip: locking/core] [parisc, s390, sparc64] no need for access_ok() in futex handling

[tip-bot2 for Al Viro]

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     dc88588990945b14d6f7ed45b70ef7b1814a5f3e
Gitweb:        https://git.kernel.org/tip/dc88588990945b14d6f7ed45b70ef7b1814a5f3e
Author:        Al Viro <viro@zeniv.linux.org.uk>
AuthorDate:    Sun, 16 Feb 2020 10:26:50 -05:00
Committer:     Al Viro <viro@zeniv.linux.org.uk>
CommitterDate: Fri, 27 Mar 2020 23:58:52 -04:00

[parisc, s390, sparc64] no need for access_ok() in futex handling

access_ok() is always true on those

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/parisc/include/asm/futex.h   | 3 ---
 arch/s390/include/asm/futex.h     | 2 --
 arch/sparc/include/asm/futex_64.h | 2 --
 3 files changed, 7 deletions(-)

diff --git a/arch/parisc/include/asm/futex.h b/arch/parisc/include/asm/futex.h
index c10cc90..c459f65 100644
--- a/arch/parisc/include/asm/futex.h
+++ b/arch/parisc/include/asm/futex.h
@@ -39,9 +39,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
 	int oldval, ret;
 	u32 tmp;
 
-	if (!access_ok(uaddr, sizeof(u32)))
-		return -EFAULT;
-
 	_futex_spin_lock_irqsave(uaddr, &flags);
 
 	ret = -EFAULT;
diff --git a/arch/s390/include/asm/futex.h b/arch/s390/include/asm/futex.h
index ed965c3..26f9144 100644
--- a/arch/s390/include/asm/futex.h
+++ b/arch/s390/include/asm/futex.h
@@ -28,8 +28,6 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
 	int oldval = 0, newval, ret;
 	mm_segment_t old_fs;
 
-	if (!access_ok(uaddr, sizeof(u32)))
-		return -EFAULT;
 	old_fs = enable_sacf_uaccess();
 	switch (op) {
 	case FUTEX_OP_SET:
diff --git a/arch/sparc/include/asm/futex_64.h b/arch/sparc/include/asm/futex_64.h
index 84fffaa..72de967 100644
--- a/arch/sparc/include/asm/futex_64.h
+++ b/arch/sparc/include/asm/futex_64.h
@@ -35,8 +35,6 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
 {
 	int oldval = 0, ret, tem;
 
-	if (!access_ok(uaddr, sizeof(u32)))
-		return -EFAULT;
 	if (unlikely((((unsigned long) uaddr) & 0x3UL)))
 		return -EINVAL;