[tor-bugs] #25440 [Core Tor/Tor]: Broken openat syscall in Sandbox mode
Tor Bug Tracker & Wiki
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Tue Apr 17 00:08:38 UTC 2018
#25440: Broken openat syscall in Sandbox mode
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Reporter: ageisp0lis | Owner: nickm
Type: defect | Status:
| needs_information
Priority: Medium | Milestone: Tor:
| 0.3.4.x-final
Component: Core Tor/Tor | Version: Tor:
| 0.3.3.3-alpha
Severity: Normal | Resolution:
Keywords: sandbox, 033-must, regression, | Actual Points:
033-triage-20180326, 033-included-20180326 |
033-backport, AffectsTails |
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by Jigsaw52):
I was wrong. The number of parameters is just strace pretty printing the
call. The syscall is exactly the same on both cases.
The problem is related to the constant AT_FDCWD.
The changes on this branch fixed the problem on my machine:
https://github.com/Jigsaw52/tor/tree/quick-fix-25440
It does not work if I only change SCMP_CMP_STR to SCMP_CMP. The cast for
uint32_t is needed. I do not know why and I think they will break on other
machines but it seems like a good starting point for a better solution.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25440#comment:16>
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