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Commit 91344493 authored by Al Viro's avatar Al Viro
Browse files

arm: don't zero in __copy_from_user_inatomic()/__copy_from_user() 



adjust copy_from_user(), obviously

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 7798bf21

arch/arm/include/asm/uaccess.h

+6 −5
Original line number Diff line number Diff line
@@ -533,11 +533,12 @@ __clear_user(void __user *addr, unsigned long n) 


static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)

{

	if (access_ok(VERIFY_READ, from, n))

		n = __copy_from_user(to, from, n);

	else /* security hole - plug it */

		memset(to, 0, n);

	return n;

	unsigned long res = n;

	if (likely(access_ok(VERIFY_READ, from, n)))

		res = __copy_from_user(to, from, n);

	if (unlikely(res))

		memset(to + (n - res), 0, res);

	return res;

}



static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)

arch/arm/lib/copy_from_user.S

+3 −6
Original line number Diff line number Diff line
@@ -98,12 +98,9 @@ ENDPROC(arm_copy_from_user) 
	.pushsection .fixup,"ax"

	.align 0

	copy_abort_preamble

	ldmfd	sp!, {r1, r2}

	sub	r3, r0, r1

	rsb	r1, r3, r2

	str	r1, [sp]

	bl	__memzero

	ldr	r0, [sp], #4

	ldmfd	sp!, {r1, r2, r3}

	sub	r0, r0, r1

	rsb	r0, r0, r2

	copy_abort_end

	.popsection