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Bug 1690102

Summary: setarch(8) does not check error return values properly.
Product: Red Hat Enterprise Linux 7 Reporter: Peter Jones <pjones>
Component: util-linuxAssignee: Karel Zak <kzak>
Status: POST --- QA Contact: Radka Skvarilova <rskvaril>
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Version: 7.6   
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Description Peter Jones 2019-03-18 19:18:40 UTC
Description of problem: If I run this in a container where seccomp denies ADDR_LIMIT_3G, it thinks it worked when it did not:

[root@daf23c28d8db build]# setarch linux32 -B uname -m
x86_64

This is because setarch is only checking for -EINVAL.  If I run it without -B, it works as expected:

[root@daf23c28d8db build]# setarch linux32 uname -m
i686

Version-Release number of selected component (if applicable): util-linux-2.23.2-59.el7

How reproducible: 100%

Steps to Reproduce:
1. create a container on a system where seccomp denies some personality(2) flags (podman or docker on fedora 29 will do this)
2. run setarch linux32 -B uname -m
3. see the wrong value

Actual results: setarch execs the binary after personality(2) has returned failure


Expected results: setarch shows an error

Comment 2 Karel Zak 2019-03-25 15:08:05 UTC
It seems we need upstream commits 9ed11cc260a28a64de0c1fa5d94d7cd6273781a5 and ae7065760d9bbe776a93a73d88e85c7796acb8cc.