linux-hardening - [PATCH] usercopy: use unsigned long instead of uintptr

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Date:   Thu, 16 Jun 2022 16:36:17 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     linux-mm@...ck.org, linux-xfs@...r.kernel.org,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Matthew Wilcox <willy@...radead.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Joe Perches <joe@...ches.com>
Subject: [PATCH] usercopy: use unsigned long instead of uintptr_t

A recent commit factored out a series of annoying (unsigned long) casts
into a single variable declaration, but made the pointer type a
`uintptr_t` rather than the usual `unsigned long`. This patch changes it
to be the integer type more typically used by the kernel to represent
addresses.

Fixes: 35fb9ae4aa2e ("usercopy: Cast pointer to an integer once")
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Uladzislau Rezki <urezki@...il.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Joe Perches <joe@...ches.com>
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
 mm/usercopy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/usercopy.c b/mm/usercopy.c
index 4e1da708699b..c1ee15a98633 100644
--- a/mm/usercopy.c
+++ b/mm/usercopy.c
@@ -161,7 +161,7 @@ static inline void check_bogus_address(const unsigned long ptr, unsigned long n,
 static inline void check_heap_object(const void *ptr, unsigned long n,
 				     bool to_user)
 {
-	uintptr_t addr = (uintptr_t)ptr;
+	unsigned long addr = (unsigned long)ptr;
 	unsigned long offset;
 	struct folio *folio;
 
-- 
2.35.1