Bug 1715823 (CVE-2018-12886)

Summary: CVE-2018-12886 gcc: spilling of stack protection address in cfgexpand.c and function.c leads to stack-overflow protection bypass
Product: [Other] Security Response Reporter: Marian Rehak <mrehak>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: ahajkova, aoliva, davejohansen, dmalcolm, fweimer, jakub, jwakely, law, mcermak, mnewsome, mpolacek, msebor, nickc, ohudlick, tborcin
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2019-06-05 12:54:07 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Blocks: 1715824    

Description Marian Rehak 2019-05-31 11:54:18 UTC 
stack_protect_prologue in cfgexpand.c and stack_protect_epilogue in function.c in GNU GCC 4.1 through 8 (under certain circumstances) generate instruction sequences when targeting ARM targets that spill the stack protector guard address, which allows bypassing the protection of -fstack-protector, -fstack-protector-all, -fstack-protector-strong, and -fstack-protector-explicit against stack overflow by controlling what the stack canary is compared against.

Upstream Issue:

https://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/arm/arm-protos.h?revision=266379&view=markup