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mm: remove usercopy_warn()

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Users of usercopy_warn() were removed by commit 53944f171a ("mm:
remove HARDENED_USERCOPY_FALLBACK")

Remove it.

Link: https://lkml.kernel.org/r/5f26643fc70b05f8455b60b99c30c17d635fa640.1644231910.git.christophe.leroy@csgroup.eu
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Stephen Kitt <steve@sk2.org>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christophe Leroy 2022-03-22 14:47:46 -07:00 committed by Linus Torvalds
parent cb325ddde5
commit 6eada26ffc
2 changed files with 0 additions and 13 deletions
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2
include/linux/uaccess.h
View File

@ -401,8 +401,6 @@ static inline void user_access_restore(unsigned long flags) { }
#endif #endif
#ifdef CONFIG_HARDENED_USERCOPY #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, void __noreturn usercopy_abort(const char *name, const char *detail,
bool to_user, unsigned long offset, bool to_user, unsigned long offset,
unsigned long len); unsigned long len);

11
mm/usercopy.c
View File

@ -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 * kmem_cache_create_usercopy() function to create the cache (and
* carefully audit the whitelist range). * 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, void __noreturn usercopy_abort(const char *name, const char *detail,
bool to_user, unsigned long offset, bool to_user, unsigned long offset,
unsigned long len) unsigned long len)