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authorLinus Torvalds <torvalds@linux-foundation.org>2013-09-04 11:08:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-04 11:08:32 -0700
commitf357a82048ff1e5645861475b014570e11ad1911 (patch)
treea3ca0cf7b1638d3e8b0a1cb5815af43dd6e0c2c3 /arch/x86/lib
parentb20c99eb668f10b855a9fd87e0a2f5db3fb3637d (diff)
parentbd1c149aa9915b9abb6d83d0f01dfd2ace0680b5 (diff)
downloadop-kernel-dev-f357a82048ff1e5645861475b014570e11ad1911.zip
op-kernel-dev-f357a82048ff1e5645861475b014570e11ad1911.tar.gz
Merge branch 'x86-smap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 SMAP fixes from Ingo Molnar: "Fixes for Intel SMAP support, to fix SIGSEGVs during bootup" * 'x86-smap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: Introduce [compat_]save_altstack_ex() to unbreak x86 SMAP x86, smap: Handle csum_partial_copy_*_user()
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/csum-wrappers_64.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/x86/lib/csum-wrappers_64.c b/arch/x86/lib/csum-wrappers_64.c
index 25b7ae8..7609e0e 100644
--- a/arch/x86/lib/csum-wrappers_64.c
+++ b/arch/x86/lib/csum-wrappers_64.c
@@ -6,6 +6,7 @@
*/
#include <asm/checksum.h>
#include <linux/module.h>
+#include <asm/smap.h>
/**
* csum_partial_copy_from_user - Copy and checksum from user space.
@@ -52,8 +53,10 @@ csum_partial_copy_from_user(const void __user *src, void *dst,
len -= 2;
}
}
+ stac();
isum = csum_partial_copy_generic((__force const void *)src,
dst, len, isum, errp, NULL);
+ clac();
if (unlikely(*errp))
goto out_err;
@@ -82,6 +85,8 @@ __wsum
csum_partial_copy_to_user(const void *src, void __user *dst,
int len, __wsum isum, int *errp)
{
+ __wsum ret;
+
might_sleep();
if (unlikely(!access_ok(VERIFY_WRITE, dst, len))) {
@@ -105,8 +110,11 @@ csum_partial_copy_to_user(const void *src, void __user *dst,
}
*errp = 0;
- return csum_partial_copy_generic(src, (void __force *)dst,
- len, isum, NULL, errp);
+ stac();
+ ret = csum_partial_copy_generic(src, (void __force *)dst,
+ len, isum, NULL, errp);
+ clac();
+ return ret;
}
EXPORT_SYMBOL(csum_partial_copy_to_user);
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