From: Al Viro <viro@zeniv.linux.org.uk>
To: Nathan Chancellor <natechancellor@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Christoph Hellwig <hch@lst.de>,
Greg KH <gregkh@linuxfoundation.org>,
Alexey Dobriyan <adobriyan@gmail.com>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
kys@microsoft.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, wei.liu@kernel.org,
linux-hyperv@vger.kernel.org
Subject: Re: [PATCH 1/6] seq_file: add seq_read_iter
Date: Mon, 16 Nov 2020 03:29:42 +0000 [thread overview]
Message-ID: <20201116032942.GV3576660@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20201116003416.GA345@Ryzen-9-3900X.localdomain>
On Sun, Nov 15, 2020 at 05:34:16PM -0700, Nathan Chancellor wrote:
> Still good.
>
> Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Pushed into #fixes
> > BTW, is that call of readv() really coming from init? And if it
> > is, what version of init are you using?
>
> I believe that it is but since this is WSL2, I believe that /init is a
> proprietary Microsoft implementation, rather than systemd or another
> init system:
>
> https://wiki.ubuntu.com/WSL#Keeping_Ubuntu_Updated_in_WSL
>
> So I am not sure how possible it is to see exactly what is going on or
> getting it improved.
Oh, well... Anyway, as a regression test it's interesting:
#include <sys/uio.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
main()
{
static char s[1024];
static struct iovec v[2] = {{NULL, 0}, {s, 1024}};
for(;;) {
ssize_t n = readv(0, v, 2), m, w;
if (n < 0) {
perror("readv");
return -1;
}
if (!n)
return 0;
for (m = 0; m < n; m += w) {
w = write(1, s + m, n - m);
if (w < 0)
perror("write");
}
}
}
which ought to copy stdin to stdout; with this bug it would (on sufficiently
large seq_file-based files) fail with "readv: Bad address" (-EFAULT, that is).
next prev parent reply other threads:[~2020-11-16 3:30 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-04 8:27 support splice reads on seq_file based procfs files v2 Christoph Hellwig
2020-11-04 8:27 ` [PATCH 1/6] seq_file: add seq_read_iter Christoph Hellwig
2020-11-10 21:32 ` Al Viro
2020-11-10 21:35 ` Al Viro
2020-11-10 23:20 ` Al Viro
2020-11-11 7:55 ` Christoph Hellwig
2020-11-11 17:54 ` Linus Torvalds
2020-11-11 21:52 ` Al Viro
2020-11-11 22:21 ` Al Viro
2020-11-11 22:27 ` Linus Torvalds
2020-11-11 23:00 ` Al Viro
2020-11-13 23:54 ` Nathan Chancellor
2020-11-14 1:17 ` Al Viro
2020-11-14 3:01 ` Nathan Chancellor
2020-11-14 3:54 ` Al Viro
2020-11-14 4:14 ` Nathan Chancellor
2020-11-14 5:50 ` Al Viro
2020-11-14 6:19 ` Nathan Chancellor
2020-11-14 7:00 ` Al Viro
2020-11-14 20:50 ` Al Viro
2020-11-15 15:53 ` Al Viro
2020-11-15 16:56 ` Linus Torvalds
2020-11-15 21:41 ` Nathan Chancellor
2020-11-15 23:38 ` Al Viro
2020-11-15 23:51 ` Nathan Chancellor
2020-11-16 0:25 ` Al Viro
2020-11-16 0:34 ` Nathan Chancellor
2020-11-16 3:29 ` Al Viro [this message]
2020-11-27 16:29 ` Christoph Hellwig
2020-12-08 16:35 ` Christoph Hellwig
2020-12-08 18:34 ` Linus Torvalds
2020-12-08 19:49 ` Al Viro
2020-12-08 20:25 ` Linus Torvalds
2020-12-08 20:53 ` Al Viro
2020-12-08 21:01 ` Linus Torvalds
2020-12-08 19:49 ` Greg KH
2020-11-14 21:44 ` Al Viro
2020-11-04 8:27 ` [PATCH 2/6] proc: wire up generic_file_splice_read for iter ops Christoph Hellwig
2020-11-04 8:27 ` [PATCH 3/6] proc/cpuinfo: switch to ->read_iter Christoph Hellwig
2020-11-04 8:27 ` [PATCH 4/6] proc/stat: " Christoph Hellwig
2020-11-04 8:27 ` [PATCH 5/6] proc "single files": " Christoph Hellwig
2020-11-04 8:27 ` [PATCH 6/6] proc "seq " Christoph Hellwig
2020-11-04 17:53 ` support splice reads on seq_file based procfs files v2 Linus Torvalds
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