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From: "Butenko, Anton" <abutenko@HIDDEN>
To: "bug-parted@HIDDEN" <bug-parted@HIDDEN>
Subject: Crash trying to parse nilfs2 superblock
Thread-Topic: Crash trying to parse nilfs2 superblock
Thread-Index: AQHbie+cxuHY6JG080WFef/Q3C2wfA==
Date: Fri, 28 Feb 2025 15:21:00 +0000
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--_000_BYAPR17MB2151C500C91AABDF0495CE19B6CC2BYAPR17MB2151namp_
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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
--_000_BYAPR17MB2151C500C91AABDF0495CE19B6CC2BYAPR17MB2151namp_
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<p class=3D"MsoNormal">Hello,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </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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--_000_BYAPR17MB2151C500C91AABDF0495CE19B6CC2BYAPR17MB2151namp_--
"Butenko, Anton" <abutenko@HIDDEN>:bug-parted@HIDDEN.
Full text available.bug-parted@HIDDEN:bug#76648; Package parted.
Full text available.
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.