[GH-ISSUE #291] 32-bit firejail allows 64-bit executable, bypassing --seccomp limitations #205

New issue

Closed

opened 2026-05-05 05:19:05 -06:00 by gitea-mirror · 2 comments

gitea-mirror commented

2026-05-05 05:19:05 -06:00

Owner

Originally created by @yumkam on GitHub (Feb 11, 2016).
Original GitHub issue: https://github.com/netblue30/firejail/issues/291

On amd64 cpu, with amd64 kernel, and mostly 32-bit userland,

cp `which strace` /path/to/copy/strace
firejail --seccomp
/path/to/copy/strace /path/to/32-bit-executable # fails with noise in syslog, as expected
strace64 /path/to/64-bit-executable # unexpectedly, works without problem
# (and note that strace64|gdb64|gdb-multiarch are not blacklisted, unlike strace|gdb)

Maybe, it would be good to block all unhandled architectures, if seccomp2 enforcement enabled?

Originally created by @yumkam on GitHub (Feb 11, 2016). Original GitHub issue: https://github.com/netblue30/firejail/issues/291 On amd64 cpu, with amd64 kernel, and mostly 32-bit userland, ``` sh cp `which strace` /path/to/copy/strace firejail --seccomp /path/to/copy/strace /path/to/32-bit-executable # fails with noise in syslog, as expected strace64 /path/to/64-bit-executable # unexpectedly, works without problem # (and note that strace64|gdb64|gdb-multiarch are not blacklisted, unlike strace|gdb) ``` Maybe, it would be good to block all unhandled architectures, if seccomp2 enforcement enabled?

gitea-mirror

2026-05-05 05:19:05 -06:00

closed this issue
added the
bug
label

gitea-mirror commented

2026-05-05 05:19:11 -06:00

Author

Owner

@netblue30 commented on GitHub (Feb 11, 2016):

This could be a security problem, I'll look into it. Thanks!

@netblue30 commented on GitHub (Feb 11, 2016): This could be a security problem, I'll look into it. Thanks!

gitea-mirror commented

2026-05-05 05:19:15 -06:00

Author

Owner

@netblue30 commented on GitHub (Feb 13, 2016):

Fixed!

@netblue30 commented on GitHub (Feb 13, 2016): Fixed!

No milestone

No project

No assignees

1 participant

Notifications

Due date

The due date is invalid or out of range. Please use the format "yyyy-mm-dd".

No due date set.

Dependencies

No dependencies set.

Reference: github-starred/firejail#205

No description provided.

Rows
Columns