GNU logs - #76648, boring messages

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Subject: bug#76648: Crash trying to parse nilfs2 superblock
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Hello,

I was checking how good is fix of

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D34392
=93Avoid sigsegv in case 2nd nilfs2 superblock magic accidently found.=94

In systemd, libblkid and parted and found a slight possibility of crash in =
parted regarding to the changes in the referred bug.
The parted fix includes a chance to crash in case of nilfs2 superblock havi=
ng correct magic, but corrupted =93bytes=94 field (value in range from 12 t=
o 20).

I=92ve modified the code to avoid the sigsegv and align implementation with=
 the libblkid implementation:
https://github.com/util-linux/util-linux/commit/ac681a310c32319423297544833=
932f4d689a7a2
And modified t4301-nilfs2-badsb2.sh test code to trigger this case as well =
as the previously reported one.

I've attached a patch with my modifications. Can you, please, look at it?

Regards,
Anton Butenko

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<p class=3D"MsoNormal">Hello,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I was checking how good is fix of<br>
<br>
<a href=3D"https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D34392">https://d=
ebbugs.gnu.org/cgi/bugreport.cgi?bug=3D34392</a><br>
=93Avoid sigsegv in case 2nd nilfs2 superblock magic accidently found.=94<b=
r>
<br>
<o:p></o:p></p>
<p class=3D"MsoNormal">In systemd, libblkid and parted and found a slight p=
ossibility of crash in parted regarding to the changes in the referred bug.=
<br>
The parted fix includes a chance to crash in case of nilfs2 superblock havi=
ng correct magic, but corrupted =93bytes=94 field (value in range from 12 t=
o 20).<br>
<br>
I=92ve modified the code to avoid the sigsegv and align implementation with=
 the libblkid implementation:<br>
<a href=3D"https://github.com/util-linux/util-linux/commit/ac681a310c323194=
23297544833932f4d689a7a2">https://github.com/util-linux/util-linux/commit/a=
c681a310c32319423297544833932f4d689a7a2</a><br>
And modified t4301-nilfs2-badsb2.sh test code to trigger this case as well =
as the previously reported one.<br>
<br>
I've attached a patch with my modifications. Can you, please, look at it?<b=
r>
<br>
Regards,<br>
Anton Butenko<o:p></o:p></p>
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: "Butenko, Anton" <abutenko@HIDDEN>
Subject: bug#76648: Acknowledgement (Crash trying to parse nilfs2 superblock)
Message-ID: <handler.76648.B.174076420825299.ack <at> debbugs.gnu.org>
References: <BYAPR17MB2151C500C91AABDF0495CE19B6CC2@HIDDEN>
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Reply-To: 76648 <at> debbugs.gnu.org
Date: Fri, 28 Feb 2025 17:37:03 +0000

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