From: Gabriel Paubert <paubert@iram.es> To: Andreas Schwab <schwab@linux-m68k.org> Cc: Aleksa Sarai <cyphar@cyphar.com>, linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>, Rasmus Villemoes <linux@rasmusvillemoes.dk>, Alexei Starovoitov <ast@kernel.org>, linux-kernel@vger.kernel.org, David Howells <dhowells@redhat.com>, linux-kselftest@vger.kernel.org, sparclinux@vger.kernel.org, Shuah Khan <shuah@kernel.org>, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Tycho Andersen <tycho@tycho.ws>, Aleksa Sarai <asarai@suse.de>, Jiri Olsa <jolsa@redhat.com>, Alexander Shishkin <alexander.shishkin@linux.intel.com>, Ingo Molnar <mingo@redhat.com>, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-xtensa@linux-xtensa.org, Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>, Jann Horn <jannh@google.com>, linuxppc-dev@lists.ozlabs.org, linux-m68k@lists.linux-m68k.org, Al Viro <viro@zeniv.linux.org.uk>, Andy Lutomirski <luto@kernel.org>, Shuah Khan <skhan@linuxfoundation.org>, Namhyung Kim <namhyung@kernel.org>, David Drysdale <drysdale@google.com>, Christian Brauner <christian@brauner.io>, "J. Bruce Fields" <bfields@fieldses.org>, linux-parisc@vger.kernel.org, linux-api@vger.kernel.org, Chanho Min <chanho.min@lge.com>, Jeff Layton <jlayton@kernel.org>, Oleg Nesterov <oleg@redhat.com>, Eric Biederman <ebiederm@xmission.com>, linux-alpha@vger.kernel.org, linux-fsdevel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>, Linus Torvalds <torvalds@linux-foundation.org>, containers@lists.linux-foundation.org Subject: Re: [PATCH v12 01/12] lib: introduce copy_struct_{to, from}_user helpers Date: Thu, 5 Sep 2019 12:13:15 +0200 Message-ID: <20190905101315.GA25637@lt-gp.iram.es> (raw) In-Reply-To: <mvma7bj85yo.fsf@linux-m68k.org> On Thu, Sep 05, 2019 at 11:09:35AM +0200, Andreas Schwab wrote: > On Sep 05 2019, Aleksa Sarai <cyphar@cyphar.com> wrote: > > > diff --git a/lib/struct_user.c b/lib/struct_user.c > > new file mode 100644 > > index 000000000000..7301ab1bbe98 > > --- /dev/null > > +++ b/lib/struct_user.c > > @@ -0,0 +1,182 @@ > > +// SPDX-License-Identifier: GPL-2.0-or-later > > +/* > > + * Copyright (C) 2019 SUSE LLC > > + * Copyright (C) 2019 Aleksa Sarai <cyphar@cyphar.com> > > + */ > > + > > +#include <linux/types.h> > > +#include <linux/export.h> > > +#include <linux/uaccess.h> > > +#include <linux/kernel.h> > > +#include <linux/string.h> > > + > > +#define BUFFER_SIZE 64 > > + > > +/* > > + * "memset(p, 0, size)" but for user space buffers. Caller must have already > > + * checked access_ok(p, size). > > + */ > > +static int __memzero_user(void __user *p, size_t s) > > +{ > > + const char zeros[BUFFER_SIZE] = {}; > > Perhaps make that static? On SMP? It should at least be per cpu, and I'm not even sure with preemption. Gabriel > > Andreas. > > -- > Andreas Schwab, schwab@linux-m68k.org > GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 > "And now for something completely different."
next prev parent reply index Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-09-04 20:19 [PATCH v12 00/12] namei: openat2(2) path resolution restrictions Aleksa Sarai 2019-09-04 20:19 ` [PATCH v12 01/12] lib: introduce copy_struct_{to,from}_user helpers Aleksa Sarai 2019-09-04 20:48 ` Linus Torvalds 2019-09-04 21:00 ` Randy Dunlap 2019-09-05 7:32 ` Peter Zijlstra 2019-09-05 9:26 ` Aleksa Sarai 2019-09-05 9:43 ` Peter Zijlstra 2019-09-05 10:57 ` Peter Zijlstra 2019-09-11 10:37 ` Aleksa Sarai 2019-09-05 13:35 ` Aleksa Sarai 2019-09-05 17:01 ` Aleksa Sarai 2019-09-05 8:43 ` Rasmus Villemoes 2019-09-05 9:50 ` Aleksa Sarai 2019-09-05 10:45 ` Christian Brauner 2019-09-05 9:09 ` Andreas Schwab 2019-09-05 10:13 ` Gabriel Paubert [this message] 2019-09-05 11:05 ` Christian Brauner 2019-09-05 11:17 ` Rasmus Villemoes 2019-09-05 11:29 ` Christian Brauner 2019-09-05 13:40 ` Aleksa Sarai 2019-09-05 11:09 ` Christian Brauner 2019-09-05 11:27 ` Aleksa Sarai 2019-09-05 11:40 ` Christian Brauner 2019-09-05 18:07 ` Al Viro 2019-09-05 18:23 ` Christian Brauner 2019-09-05 18:28 ` Al Viro 2019-09-05 18:35 ` Christian Brauner 2019-09-05 19:56 ` Aleksa Sarai 2019-09-05 22:31 ` Al Viro 2019-09-06 7:00 ` Christian Brauner 2019-09-05 23:00 ` Aleksa Sarai 2019-09-05 23:49 ` Al Viro 2019-09-06 0:09 ` Aleksa Sarai 2019-09-06 0:14 ` Al Viro 2019-09-04 20:19 ` [PATCH v12 02/12] clone3: switch to copy_struct_from_user() Aleksa Sarai 2019-09-04 20:19 ` [PATCH v12 03/12] sched_setattr: switch to copy_struct_{to,from}_user() Aleksa Sarai 2019-09-04 20:19 ` [PATCH v12 04/12] perf_event_open: switch to copy_struct_from_user() Aleksa Sarai 2019-09-04 20:19 ` [PATCH v12 05/12] namei: obey trailing magic-link DAC permissions Aleksa Sarai 2019-09-17 21:30 ` Jann Horn 2019-09-18 13:51 ` Aleksa Sarai 2019-09-18 15:46 ` Aleksa Sarai 2019-09-04 20:19 ` [PATCH v12 06/12] procfs: switch magic-link modes to be more sane Aleksa Sarai 2019-09-04 20:19 ` [PATCH v12 07/12] open: O_EMPTYPATH: procfs-less file descriptor re-opening Aleksa Sarai 2019-09-04 20:19 ` [PATCH v12 08/12] namei: O_BENEATH-style path resolution flags Aleksa Sarai 2019-09-04 20:19 ` [PATCH v12 09/12] namei: LOOKUP_IN_ROOT: chroot-like path resolution Aleksa Sarai 2019-09-04 20:19 ` [PATCH v12 10/12] namei: aggressively check for nd->root escape on ".." resolution Aleksa Sarai 2019-09-04 21:09 ` Linus Torvalds 2019-09-04 21:35 ` Linus Torvalds 2019-09-04 21:36 ` Linus Torvalds 2019-09-04 21:48 ` Aleksa Sarai 2019-09-04 22:16 ` Linus Torvalds 2019-09-04 22:31 ` David Howells 2019-09-04 22:38 ` Linus Torvalds 2019-09-04 23:29 ` Al Viro 2019-09-04 23:44 ` Linus Torvalds 2019-09-04 20:19 ` [PATCH v12 11/12] open: openat2(2) syscall Aleksa Sarai 2019-09-04 21:00 ` Randy Dunlap 2019-09-07 12:40 ` Jeff Layton 2019-09-07 16:58 ` Linus Torvalds 2019-09-07 17:42 ` Andy Lutomirski 2019-09-07 17:45 ` Linus Torvalds 2019-09-07 18:15 ` Andy Lutomirski 2019-09-10 6:35 ` Ingo Molnar 2019-09-08 16:24 ` Aleksa Sarai 2019-09-04 20:19 ` [PATCH v12 12/12] selftests: add openat2(2) selftests Aleksa Sarai
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