Commit 76624175 authored by Mark Rutland's avatar Mark Rutland Committed by Will Deacon

arm64: uaccess: consistently check object sizes

Currently in arm64's copy_{to,from}_user, we only check the
source/destination object size if access_ok() tells us the user access
is permissible.

However, in copy_from_user() we'll subsequently zero any remainder on
the destination object. If we failed the access_ok() check, that applies
to the whole object size, which we didn't check.

To ensure that we catch that case, this patch hoists check_object_size()
to the start of copy_from_user(), matching __copy_from_user() and
__copy_to_user(). To make all of our uaccess copy primitives consistent,
the same is done to copy_to_user().

Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 21bdbb71
...@@ -379,9 +379,9 @@ static inline unsigned long __must_check copy_from_user(void *to, const void __u ...@@ -379,9 +379,9 @@ static inline unsigned long __must_check copy_from_user(void *to, const void __u
{ {
unsigned long res = n; unsigned long res = n;
kasan_check_write(to, n); kasan_check_write(to, n);
check_object_size(to, n, false);
if (access_ok(VERIFY_READ, from, n)) { if (access_ok(VERIFY_READ, from, n)) {
check_object_size(to, n, false);
res = __arch_copy_from_user(to, from, n); res = __arch_copy_from_user(to, from, n);
} }
if (unlikely(res)) if (unlikely(res))
...@@ -392,9 +392,9 @@ static inline unsigned long __must_check copy_from_user(void *to, const void __u ...@@ -392,9 +392,9 @@ static inline unsigned long __must_check copy_from_user(void *to, const void __u
static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n) static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)
{ {
kasan_check_read(from, n); kasan_check_read(from, n);
check_object_size(from, n, true);
if (access_ok(VERIFY_WRITE, to, n)) { if (access_ok(VERIFY_WRITE, to, n)) {
check_object_size(from, n, true);
n = __arch_copy_to_user(to, from, n); n = __arch_copy_to_user(to, from, n);
} }
return n; return n;
......
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