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From: "petre.rodan at subdimension dot ro"
 <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/31212] New: seekdir() unexected directory stream
 positioning on 32bit arm
Date: Thu, 04 Jan 2024 21:53:08 +0000
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X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.37
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31212

            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=3D15284&action=3Ded=
it
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 ifd=
ef
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-l=
inux-Set-internal-DIR-filepos-as-off64_t-BZ-23960-B.patch

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