Re: [PATCH v12 01/12] lib: introduce copy_struct_{to,from}_user helpers
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- To: Aleksa Sarai <cyphar@xxxxxxxxxx>
- Subject: Re: [PATCH v12 01/12] lib: introduce copy_struct_{to,from}_user helpers
- From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 4 Sep 2019 13:48:43 -0700
- Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxx>, "J. Bruce Fields" <bfields@xxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, David Howells <dhowells@xxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Christian Brauner <christian@xxxxxxxxxx>, Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>, Eric Biederman <ebiederm@xxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Tycho Andersen <tycho@xxxxxxxx>, David Drysdale <drysdale@xxxxxxxxxx>, Chanho Min <chanho.min@xxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Namhyung Kim <namhyung@xxxxxxxxxx>, Aleksa Sarai <asarai@xxxxxxx>, Linux Containers <containers@xxxxxxxxxxxxxxxxxxxxxxxxxx>, alpha <linux-alpha@xxxxxxxxxxxxxxx>, Linux API <linux-api@xxxxxxxxxxxxxxx>, linux-arch <linux-arch@xxxxxxxxxxxxxxx>, Linux ARM <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, Linux List Kernel Mailing <linux-kernel@xxxxxxxxxxxxxxx>, "open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@xxxxxxxxxxxxxxx>, linux-m68k <linux-m68k@xxxxxxxxxxxxxxx>, linux-mips@xxxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-s390 <linux-s390@xxxxxxxxxxxxxxx>, Linux-sh list <linux-sh@xxxxxxxxxxxxxxx>, linux-xtensa@xxxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx
- In-reply-to: <20190904201933.10736-2-cyphar@cyphar.com>
- References: <20190904201933.10736-1-cyphar@cyphar.com> <20190904201933.10736-2-cyphar@cyphar.com>
On Wed, Sep 4, 2019 at 1:20 PM Aleksa Sarai <cyphar@xxxxxxxxxx> wrote:
>
> A common pattern for syscall extensions is increasing the size of a
> struct passed from userspace, such that the zero-value of the new fields
> result in the old kernel behaviour (allowing for a mix of userspace and
> kernel vintages to operate on one another in most cases).
Ack, this makes the whole series (and a few unrelated system calls) cleaner.
Linus
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