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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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arch/arm/kernel/armksyms.c
+3 -3
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@@ -91,9 +91,9 @@ EXPORT_SYMBOL(__memzero);
#ifdef CONFIG_MMU
EXPORT_SYMBOL(copy_page);
EXPORT_SYMBOL(__copy_from_user);
EXPORT_SYMBOL(__copy_to_user);
EXPORT_SYMBOL(__clear_user);
EXPORT_SYMBOL(arm_copy_from_user);
EXPORT_SYMBOL(arm_copy_to_user);
EXPORT_SYMBOL(arm_clear_user);
EXPORT_SYMBOL(__get_user_1);
EXPORT_SYMBOL(__get_user_2);