linux-kernel - [RFC][PATCH v2 3/8] [parisc, s390, sparc64] no need for access

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:   Fri, 27 Mar 2020 02:28:31 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC][PATCH v2 3/8] [parisc, s390, sparc64] no need for access_ok() in futex handling

From: Al Viro <viro@...iv.linux.org.uk>

access_ok() is always true on those

Signed-off-by: Al Viro <viro@...iv.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 c10cc9010cc1..c459f656c8c3 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 ed965c3ecd5b..26f9144562c9 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 84fffaaf59d3..72de967318d7 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;
 
-- 
2.11.0