Re: [PATCH v12 01/12] lib: introduce copy_struct_{to,from}_user helpers
From: Andreas Schwab <hidden>
Date: 2019-09-05 09:09:51
Also in:
linux-alpha, linux-api, linux-arch, linux-arm-kernel, linux-fsdevel, linux-kselftest, linux-s390, linux-sh, linuxppc-dev, lkml, sparclinux
Possibly related (same subject, not in this thread)
- 2019-09-11 · Re: [PATCH v12 01/12] lib: introduce copy_struct_{to,from}_user helpers · Aleksa Sarai <hidden>
- 2019-09-06 · Re: [PATCH v12 01/12] lib: introduce copy_struct_{to,from}_user helpers · Christian Brauner <hidden>
- 2019-09-06 · Re: [PATCH v12 01/12] lib: introduce copy_struct_{to,from}_user helpers · Al Viro <viro@zeniv.linux.org.uk>
- 2019-09-06 · Re: [PATCH v12 01/12] lib: introduce copy_struct_{to,from}_user helpers · Aleksa Sarai <hidden>
- 2019-09-05 · Re: [PATCH v12 01/12] lib: introduce copy_struct_{to,from}_user helpers · Al Viro <viro@zeniv.linux.org.uk>
On Sep 05 2019, Aleksa Sarai [off-list ref] wrote:
quoted hunk
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? 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."