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ARM: uaccess: provide uaccess_save_and_enable() and uaccess_restore()

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Provide uaccess_save_and_enable() and uaccess_restore() to permit
control of userspace visibility to the kernel, and hook these into
the appropriate places in the kernel where we need to access
userspace.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2015-08-19 11:02:28 +01:00
parent 08446b129b
commit 3fba7e23f7
7 changed files with 97 additions and 21 deletions
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6
arch/arm/lib/copy_from_user.S
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@@ -17,7 +17,7 @@
/*
* Prototype:
*
* size_t __copy_from_user(void *to, const void *from, size_t n)
* size_t arm_copy_from_user(void *to, const void *from, size_t n)
*
* Purpose:
*
@@ -89,11 +89,11 @@
.text
ENTRY(__copy_from_user)
ENTRY(arm_copy_from_user)
#include "copy_template.S"
ENDPROC(__copy_from_user)
ENDPROC(arm_copy_from_user)
.pushsection .fixup,"ax"
.align 0