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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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4
arch/arm/lib/uaccess_with_memcpy.c
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@@ -136,7 +136,7 @@ out:
}
unsigned long
__copy_to_user(void __user *to, const void *from, unsigned long n)
arm_copy_to_user(void __user *to, const void *from, unsigned long n)
{
/*
* This test is stubbed out of the main function above to keep
@@ -190,7 +190,7 @@ out:
return n;
}
unsigned long __clear_user(void __user *addr, unsigned long n)
unsigned long arm_clear_user(void __user *addr, unsigned long n)
{
/* See rational for this in __copy_to_user() above. */
if (n < 64)