On Mon, 7 Feb 2022 20:25:19 +0800, Miaohe Lin <linmiaohe@xxxxxxxxxx> wrote:
> On 2022/2/7 19:05, Christophe Leroy wrote:
> > Users of usercopy_warn() were removed by
> > commit 53944f171a89 ("mm: remove HARDENED_USERCOPY_FALLBACK")
> >
> > Remote it.
>
> s/Remote/Remove/
>
> Except the above nit, this patch looks good to me. Thanks.
>
> Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Likewise,
Reviewed-by: Stephen Kitt <steve@xxxxxxx>
> >
> > Cc: Stephen Kitt <steve@xxxxxxx>
> > Cc: Kees Cook <keescook@xxxxxxxxxxxx>
> > Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
> > ---
> > 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)
> >
>
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