linux-ext4 - Re: [PATCH] libext2fs: Extends commit c9a8c53b, with the same fix for ext2fs_flush2() and ext2fs_image_super

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Date:   Sat, 11 Jan 2020 03:13:43 +0300
From:   Anatoly Pugachev <matorola@...il.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH] libext2fs: Extends commit c9a8c53b, with the same fix for
 ext2fs_flush2() and ext2fs_image_super_write() on a Big Endian systems.

On Fri, Jan 10, 2020 at 8:34 PM Theodore Y. Ts'o <tytso@....edu> wrote:
>
> On Fri, Jan 10, 2020 at 11:52:17AM +0300, Anatoly Pugachev wrote:
> >
> > libext2fs: extends commit c9a8c53b, with the same fix for ext2fs_flush2() and
> > ext2fs_image_super_write() on a Big Endian systems.
> >
> > As follow-up to previous discussion 'dumpe2fs / mke2fs sigserv on sparc64'
> >
> > Used find for files which refer to:
> >
> > e2fsprogs.git$ find . -name \*.c | xargs grep -cl 'gdp = ext2fs_group_desc'
> > ./lib/ext2fs/closefs.c
> > ./lib/ext2fs/openfs.c
> > ./lib/ext2fs/imager.c
> >
> > And applied the same check for a null pointer.
> >
> > Tested on a debian linux with sparc64 LDOM and ppc64 LPAR.
> >
> > Fixes sigserv with test suite in "i_bitmaps" test.
>
> As far as I know, the i_bitmaps test is passing on on sparc64 and
> ppc64.  Search for i_bitmaps in:
>
> https://buildd.debian.org/status/fetch.php?pkg=e2fsprogs&arch=sparc64&ver=1.45.5-2&stamp=1578527938&raw=0
>    and
> https://buildd.debian.org/status/fetch.php?pkg=e2fsprogs&arch=ppc64&ver=1.45.5-2&stamp=1578526270&raw=0
>
> The bug in c9a8c53b was caused by SPARSE_SUPER being passed to
> ext2fs_open().  But that doesn't happen in misc/e2image.
>
> I can see optimizing ext2fs_flush() to skip byte-swapping the group
> descriptors if the SUPER_ONLY flag is enabled.  And I can see
> ext2fs_image_super_write() checking to see if the SUPER_ONLY flag is
> set, and returning an error in that case.
>
> But I don't think any of the current e2fsprogs are crashing at the
> moment.  Am I missing something?

Ted,

I'm using "master" branch for my tests, and debian probably using
"debian/master" .
Even test count is differ. In master branch 366 tests and in
"debian/master" 356 tests.

$ git br -vvv
  debian/master 0ba96395 [origin/debian/master] debian/patches: update
for 1.45.5-2 release
* master        32d33132 [origin/master] Merge branch 'maint' into next

Can you please try master branch on any (sparc64 or ppc64) debian
porter boxes? (There's new ppc64 porter box coming soon)
Or on ppc64/sparc64 "gcc compile test" farm machines?

And it's actually up to you, maybe my patch is irrelevant (and sorry
for the noise then), since i don't know internals for e2fsprogs.

Thanks.