NetBSD Problem Report #49460
From www@NetBSD.org Tue Dec 9 22:11:45 2014
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for <gnats-bugs@gnats.NetBSD.org>; Tue, 9 Dec 2014 22:11:45 +0000 (UTC)
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Date: Tue, 9 Dec 2014 22:11:43 +0000 (UTC)
From: alnsn@NetBSD.org
Reply-To: alnsn@NetBSD.org
To: gnats-bugs@NetBSD.org
Subject: kdump hangs on big ktr_len values
X-Send-Pr-Version: www-1.0
>Number: 49460
>Category: bin
>Synopsis: kdump hangs on big ktr_len values
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: bin-bug-people
>State: closed
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Dec 09 22:15:00 +0000 2014
>Closed-Date: Sun Mar 27 21:59:12 +0000 2016
>Last-Modified: Sun Mar 27 21:59:12 +0000 2016
>Originator: Alexander Nasonov
>Release: and64 -current (7.99.1)
>Organization:
TNF
>Environment:
>Description:
When ktr_len field in ktr_header is bigger than INT_MAX/2 + 1, the loop 'while (ktrlen > size) size *= 2;' will reach size=0 and never terminate.
>How-To-Repeat:
I was running afl-fuzz and I executed kdump fuzzer_stats by mistake.
>Fix:
Add if (ktrlen > INT_MAX / 2) errx(1, "bogus length 0x%x", ktrlen);
>Release-Note:
>Audit-Trail:
From: "Alexander Nasonov" <alnsn@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc:
Subject: PR/49460 CVS commit: src/usr.bin/kdump
Date: Sun, 27 Mar 2016 21:51:20 +0000
Module Name: src
Committed By: alnsn
Date: Sun Mar 27 21:51:20 UTC 2016
Modified Files:
src/usr.bin/kdump: kdump.c
Log Message:
Don't enter infinite loop on big ktr_len values.
Fixes PR 49460.
To generate a diff of this commit:
cvs rdiff -u -r1.122 -r1.123 src/usr.bin/kdump/kdump.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
State-Changed-From-To: open->closed
State-Changed-By: alnsn@NetBSD.org
State-Changed-When: Sun, 27 Mar 2016 21:59:12 +0000
State-Changed-Why:
Fixed.
>Unformatted:
(Contact us)
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