[Bug libc/31212] New: seekdir() unexected directory stream positioning on 32bit arm

[Bug libc/31212] New: seekdir() unexected directory stream positioning on 32bit arm

[petre.rodan at subdimension dot ro]

https://sourceware.org/bugzilla/show_bug.cgi?id=31212

            Bug ID: 31212
           Summary: seekdir() unexected directory stream positioning on
                    32bit arm
           Product: glibc
           Version: 2.37
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: petre.rodan at subdimension dot ro
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 15284
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15284&action=edit
seekdir test for armv7

hi there!

my stable branch Gentoo Linux comes with a 32-bit specific patch to glibc 2.37,
found here [1] - I guess the offending patch is the one that modifies
sysdeps/unix/sysv/linux/seekdir.c to add the _DIRENT_OFFSET_TRANSLATION ifdef
block.

I have attached a sample test which I run on my armv7. the output reads:

 ./main
 pre:           . .. clockevents platform w1 serio iio gpio event_source
mdio_bus soc cpu mmc scsi mmc_rpmb spi clocksource hid dp-aux usb serial
serial-base
cec sdio genpd nvmem gadget workqueue virtio container i2c mipi-dsi
 s0 location:  4294967295
 s0 entries:
 rew location: 1
 rew entries:   . .. clockevents platform w1 serio iio gpio event_source
mdio_bus soc cpu mmc scsi mmc_rpmb spi clocksource hid dp-aux usb serial
serial-base
cec sdio genpd nvmem gadget workqueue virtio container i2c mipi-dsi

as you can see, seekdir(dp, 0) leaves the location at an invalid -1 value
while rewinddir(dp) works correctly.
I guess that patch is already part of the glibc repo, so can you reproduce the
problem on an armv7?

running the test program on an amd64 Gentoo that contains the same patches
returns a perfect output.

thanks,
peter

[1]
https://gitweb.gentoo.org/proj/toolchain/glibc-patches.git/tree/9999/0005-linux-Set-internal-DIR-filepos-as-off64_t-BZ-23960-B.patch

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[Bug libc/31212] seekdir() unexected directory stream positioning on 32bit arm

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31212

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sam at gentoo dot org,
                   |                            |toolchain at gentoo dot org
           See Also|                            |https://sourceware.org/bugz
                   |                            |illa/show_bug.cgi?id=31186,
                   |                            |https://sourceware.org/bugz
                   |                            |illa/show_bug.cgi?id=23960,
                   |                            |https://sourceware.org/bugz
                   |                            |illa/show_bug.cgi?id=24050

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[Bug libc/31212] seekdir() unexected directory stream positioning on 32bit arm

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31212

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adhemerval.zanella at linaro dot o
                   |                            |rg

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[Bug libc/31212] seekdir() unexected directory stream positioning on 32bit arm

[petre.rodan at subdimension dot ro]

https://sourceware.org/bugzilla/show_bug.cgi?id=31212

--- Comment #1 from Petre Rodan <petre.rodan at subdimension dot ro> ---
Created attachment 15286
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15286&action=edit
output of emerge --info

for a bit of context, the bug started here

https://lkml.org/lkml/2024/1/4/281

and for the Gentoo toolchain devs I will attach the emerge --info and the glibc
USE flags

[ebuild   R    ] sys-libs/glibc-2.37-r7:2.2::gentoo  USE="caps gd multiarch ssp
static-libs -audit -cet -compile-locales -crypt -custom-cflags -doc
-hash-sysv-compat -headers-only -multilib -multilib-bootstrap -nscd -perl
-profile (-selinux) -stack-realign -suid -systemd -systemtap -test -vanilla"
18308 KiB

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[Bug libc/31212] seekdir() unexpected directory stream positioning on 32bit arm

[petre.rodan at subdimension dot ro]

https://sourceware.org/bugzilla/show_bug.cgi?id=31212

Petre Rodan <petre.rodan at subdimension dot ro> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|seekdir() unexected         |seekdir() unexpected
                   |directory stream            |directory stream
                   |positioning on 32bit arm    |positioning on 32bit arm

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[Bug libc/31212] seekdir() unexpected directory stream positioning on 32bit arm

[dilfridge at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31212

Andreas K. Huettel <dilfridge at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dilfridge at gentoo dot org

--- Comment #2 from Andreas K. Huettel <dilfridge at gentoo dot org> ---
These are non-standard patches that we carry in Gentoo, so it's not really
glibc's fault.

That said, it probably makes sense to track it here since the patches are a
workaround to a longstanding glibc problem.

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[Bug libc/31212] seekdir() unexpected directory stream positioning on 32bit arm

[dilfridge at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31212

Andreas K. Huettel <dilfridge at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.gentoo.org/sho
                   |                            |w_bug.cgi?id=922642

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