ARM: 8797/1: spectre-v1.1: harden __copy_to_user
Commit a1d09e074250fad24f1b993f327b18cc6812eb7a upstream.
Sanitize user pointer given to __copy_to_user, both for standard version
and memcopy version of the user accessor.
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David A. Long <dave.long@linaro.org>
Reviewed-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
diff --git a/arch/arm/lib/uaccess_with_memcpy.c b/arch/arm/lib/uaccess_with_memcpy.c
index 6bd1089..f598d79 100644
--- a/arch/arm/lib/uaccess_with_memcpy.c
+++ b/arch/arm/lib/uaccess_with_memcpy.c
@@ -152,7 +152,8 @@ arm_copy_to_user(void __user *to, const void *from, unsigned long n)
n = __copy_to_user_std(to, from, n);
uaccess_restore(ua_flags);
} else {
- n = __copy_to_user_memcpy(to, from, n);
+ n = __copy_to_user_memcpy(uaccess_mask_range_ptr(to, n),
+ from, n);
}
return n;
}