linux-kernel - [PATCH] mm: Remove usercopy

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Message-Id: <5f26643fc70b05f8455b60b99c30c17d635fa640.1644231910.git.christophe.leroy@csgroup.eu>
Date:   Mon,  7 Feb 2022 12:05:20 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Stephen Kitt <steve@....org>, Kees Cook <keescook@...omium.org>
Subject: [PATCH] mm: Remove usercopy_warn()

Users of usercopy_warn() were removed by
commit 53944f171a89 ("mm: remove HARDENED_USERCOPY_FALLBACK")

Remote it.

Cc: Stephen Kitt <steve@....org>
Cc: Kees Cook <keescook@...omium.org>
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 include/linux/uaccess.h |  2 --
 mm/usercopy.c           | 11 -----------
 2 files changed, 13 deletions(-)

diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index ac0394087f7d..bca27b4e5eb2 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -401,8 +401,6 @@ static inline void user_access_restore(unsigned long flags) { }
 #endif
 
 #ifdef CONFIG_HARDENED_USERCOPY
-void usercopy_warn(const char *name, const char *detail, bool to_user,
-		   unsigned long offset, unsigned long len);
 void __noreturn usercopy_abort(const char *name, const char *detail,
 			       bool to_user, unsigned long offset,
 			       unsigned long len);
diff --git a/mm/usercopy.c b/mm/usercopy.c
index d0d268135d96..e7b0cb49daa1 100644
--- a/mm/usercopy.c
+++ b/mm/usercopy.c
@@ -70,17 +70,6 @@ static noinline int check_stack_object(const void *obj, unsigned long len)
  * kmem_cache_create_usercopy() function to create the cache (and
  * carefully audit the whitelist range).
  */
-void usercopy_warn(const char *name, const char *detail, bool to_user,
-		   unsigned long offset, unsigned long len)
-{
-	WARN_ONCE(1, "Bad or missing usercopy whitelist? Kernel memory %s attempt detected %s %s%s%s%s (offset %lu, size %lu)!\n",
-		 to_user ? "exposure" : "overwrite",
-		 to_user ? "from" : "to",
-		 name ? : "unknown?!",
-		 detail ? " '" : "", detail ? : "", detail ? "'" : "",
-		 offset, len);
-}
-
 void __noreturn usercopy_abort(const char *name, const char *detail,
 			       bool to_user, unsigned long offset,
 			       unsigned long len)
-- 
2.33.1