The patch titled
Subject: pipe: move limit checking logic into pipe_set_size()
has been added to the -mm tree. Its filename is
pipe-move-limit-checking-logic-into-pipe_set_size.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/pipe-move-limit-checking-logic-into-pipe_set_size.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/pipe-move-limit-checking-logic-into-pipe_set_size.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: "Michael Kerrisk (man-pages)" <mtk.manpages@xxxxxxxxx>
Subject: pipe: move limit checking logic into pipe_set_size()
This is a preparatory patch for following work. Move the F_SETPIPE_SZ
limit-checking logic from pipe_fcntl() into pipe_set_size(). This
simplifies the code a little, and allows for reworking required in
a later patch that fixes the limit checking in pipe_set_size()
Link: http://lkml.kernel.org/r/3701b2c5-2c52-2c3e-226d-29b9deb29b50@xxxxxxxxx
Signed-off-by: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Cc: Willy Tarreau <w@xxxxxx>
Cc: Vegard Nossum <vegard.nossum@xxxxxxxxxx>
Cc: <socketpair@xxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/pipe.c | 41 ++++++++++++++++++-----------------------
1 file changed, 18 insertions(+), 23 deletions(-)
diff -puN fs/pipe.c~pipe-move-limit-checking-logic-into-pipe_set_size fs/pipe.c
--- a/fs/pipe.c~pipe-move-limit-checking-logic-into-pipe_set_size
+++ a/fs/pipe.c
@@ -1026,9 +1026,24 @@ static inline unsigned int round_pipe_si
* Allocate a new array of pipe buffers and copy the info over. Returns the
* pipe size if successful, or return -ERROR on error.
*/
-static long pipe_set_size(struct pipe_inode_info *pipe, unsigned long nr_pages)
+static long pipe_set_size(struct pipe_inode_info *pipe, unsigned long arg)
{
struct pipe_buffer *bufs;
+ unsigned int size, nr_pages;
+
+ size = round_pipe_size(arg);
+ nr_pages = size >> PAGE_SHIFT;
+
+ if (!nr_pages)
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_RESOURCE) && size > pipe_max_size)
+ return -EPERM;
+
+ if ((too_many_pipe_buffers_hard(pipe->user) ||
+ too_many_pipe_buffers_soft(pipe->user)) &&
+ !capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
/*
* We can shrink the pipe, if arg >= pipe->nrbufs. Since we don't
@@ -1112,28 +1127,9 @@ long pipe_fcntl(struct file *file, unsig
__pipe_lock(pipe);
switch (cmd) {
- case F_SETPIPE_SZ: {
- unsigned int size, nr_pages;
-
- size = round_pipe_size(arg);
- nr_pages = size >> PAGE_SHIFT;
-
- ret = -EINVAL;
- if (!nr_pages)
- goto out;
-
- if (!capable(CAP_SYS_RESOURCE) && size > pipe_max_size) {
- ret = -EPERM;
- goto out;
- } else if ((too_many_pipe_buffers_hard(pipe->user) ||
- too_many_pipe_buffers_soft(pipe->user)) &&
- !capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN)) {
- ret = -EPERM;
- goto out;
- }
- ret = pipe_set_size(pipe, nr_pages);
+ case F_SETPIPE_SZ:
+ ret = pipe_set_size(pipe, arg);
break;
- }
case F_GETPIPE_SZ:
ret = pipe->buffers * PAGE_SIZE;
break;
@@ -1142,7 +1138,6 @@ long pipe_fcntl(struct file *file, unsig
break;
}
-out:
__pipe_unlock(pipe);
return ret;
}
_
Patches currently in -mm which might be from mtk.manpages@xxxxxxxxx are
pipe-relocate-round_pipe_size-above-pipe_set_size.patch
pipe-move-limit-checking-logic-into-pipe_set_size.patch
pipe-refactor-argument-for-account_pipe_buffers.patch
pipe-fix-limit-checking-in-pipe_set_size.patch
pipe-simplify-logic-in-alloc_pipe_info.patch
pipe-fix-limit-checking-in-alloc_pipe_info.patch
pipe-make-account_pipe_buffers-return-a-value-and-use-it.patch
pipe-cap-initial-pipe-capacity-according-to-pipe-max-size-limit.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
