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Bug 1462158 - (CVE-2017-1000371) CVE-2017-1000371 kernel: offset2lib allows for the stack guard page to be jumped over
CVE-2017-1000371 kernel: offset2lib allows for the stack guard page to be jum...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20170619,reported=2...
: Security
Depends On: 1485759 1462829 1485758 1485760 1485761
Blocks: 1473655
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Reported: 2017-06-16 06:42 EDT by Andrej Nemec
Modified: 2018-08-28 18:18 EDT (History)
38 users (show)

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Doc Text:
A flaw was found in the Linux kernel's implementation of mapping ELF PIE binary loading to allow evasion of the stack-guard page protection mechanisms that intend to mitigate this behavior.
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Description Andrej Nemec 2017-06-16 06:42:55 EDT 
The offset2lib patch as used by the Linux Kernel contains a vulnerability, if RLIMIT_STACK is set to RLIMIT_INFINITY and 1 Gigabyte of memory is allocated (the maximum under the 1/4 restriction) then the stack will be grown down to 0x80000000, and as the PIE binary is mapped above 0x80000000 the minimum distance between the end of the PIE binary's read-write segment and the start of the stack becomes small enough that the stack guard page can be jumped over by an attacker. This is a different issue than CVE-2017-1000370 and CVE-2017-1000365.


Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eab09532d40090698b05a07c1c87f39fdbc5fab5
Comment 1 Andrej Nemec 2017-06-16 06:43:07 EDT 
Acknowledgments:

Name: Qualys Inc
Comment 2 Andrej Nemec 2017-06-16 06:44:00 EDT 
External References:

https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt
Comment 3 Petr Matousek 2017-06-19 12:08:31 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1462829]
Comment 5 Wade Mealing 2017-08-27 23:05:41 EDT 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat
Enterprise Linux 7, MRG-2 and realtime kernels.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6.
Future Linux kernel updates for the respective releases may address this issue.
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