As far as I can tell, this has been the case since initially committed in 2008. cpuset_setproc is the executor of cpuset reassignment; note this excerpt from the description: * 1) Set is non-null. This reparents all anonymous sets to the provided * set and replaces all non-anonymous td_cpusets with the provided set. However, reviewing cpuset_setproc_setthread() for some jail related work unearthed the error: if tdset was not anonymous, we were replacing it with `set`. If it was anonymous, then we'd rebase it onto `set` (i.e. copy the thread's mask over and AND it with `set`) but give the new anonymous set the original tdset as the parent (i.e. the base of the set we're supposed to be leaving behind). The primary visible consequences were that: 1.) cpuset_getid() following such assignment returns the wrong result, the setid that we left behind rather than the one we joined. 2.) When a process attached to the jail, the base set of any anonymous threads was a set outside of the jail. This was initially bundled in D27298, but it's a minor fix that's fairly easy to verify the correctness of. A test is included in D27307 ("badparent"), which demonstrates the issue with, effectively: osetid = cpuset_getid() newsetid = cpuset() cpuset_setaffinity(thread) cpuset_setid(osetid) cpuset_getid(thread) -> observe that it matches newsetid instead of osetid. MFC after: 1 week |
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.github/workflows | ||
bin | ||
cddl | ||
contrib | ||
crypto | ||
etc | ||
gnu | ||
include | ||
kerberos5 | ||
lib | ||
libexec | ||
release | ||
rescue | ||
sbin | ||
secure | ||
share | ||
stand | ||
sys | ||
targets | ||
tests | ||
tools | ||
usr.bin | ||
usr.sbin | ||
.arcconfig | ||
.arclint | ||
.cirrus.yml | ||
.clang-format | ||
.gitattributes | ||
.gitignore | ||
COPYRIGHT | ||
LOCKS | ||
MAINTAINERS | ||
Makefile | ||
Makefile.inc1 | ||
Makefile.libcompat | ||
Makefile.sys.inc | ||
ObsoleteFiles.inc | ||
README | ||
README.md | ||
RELNOTES | ||
UPDATING |
FreeBSD Source:
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