linux-kernel - [tip:x86/x32] compat: Fix sparse address space warnings

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Message-ID: <tip-507h7cq5e45eg6ygtykon3bf@git.kernel.org>
Date:	Sun, 2 Feb 2014 18:03:36 -0800
From:	"tip-bot for H. Peter Anvin" <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, toyoa@...sta.com, hpa@...or.com,
	mingo@...nel.org, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/x32] compat: Fix sparse address space warnings

Commit-ID:  dce44e03b0a3448ad11ac6c6e0cbe299e0400791
Gitweb:     http://git.kernel.org/tip/dce44e03b0a3448ad11ac6c6e0cbe299e0400791
Author:     H. Peter Anvin <hpa@...ux.intel.com>
AuthorDate: Sun, 2 Feb 2014 17:57:28 -0800
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Sun, 2 Feb 2014 18:00:29 -0800

compat: Fix sparse address space warnings

In compat_sys_old_getrlimit() we pass a kernel pointer to
sys_old_getrlimit() inside a set_fs() bracket.  This is okay, so we
can safely cast the affected pointer to __user.

In compat_clock_nanosleep_restart(), the variable "rmtp" holds a user
pointer.  Annotate it as such.

Both of these warnings are ancient, but were reported by Fengguang
Wu's test system due to other changes.

Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
Cc: Toyo Abe <toyoa@...sta.com>
Link: http://lkml.kernel.org/n/tip-507h7cq5e45eg6ygtykon3bf@git.kernel.org
---
 kernel/compat.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/compat.c b/kernel/compat.c
index 3afc524..7076b57 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -451,7 +451,7 @@ asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 	mm_segment_t old_fs = get_fs();
 
 	set_fs(KERNEL_DS);
-	ret = sys_old_getrlimit(resource, &r);
+	ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
 	set_fs(old_fs);
 
 	if (!ret) {
@@ -799,7 +799,7 @@ static long compat_clock_nanosleep_restart(struct restart_block *restart)
 	long err;
 	mm_segment_t oldfs;
 	struct timespec tu;
-	struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
+	struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
 
 	restart->nanosleep.rmtp = (struct timespec __user *) &tu;
 	oldfs = get_fs();
--
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