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fsec-optimize: Optimize BPF with current seccomp error action, not
just KILL
fseccomp: use correct BPF code for errno action
firejail: honor seccomp error action for X32 and secondary filters,
rebuild filters if the error action is changed
Closes: #3933
Signed-off-by: Topi Miettinen <toiwoton@gmail.com>
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(hopefully) fixes the issues that led to reverting
commits 6abb65d328af61d67361890743190bd4c57f8e3c and 98e42dc6da4e4b1e47ed2aa020012d4dedc1e80e
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hardening: run plugins with dumpable flag cleared
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Allow `log` as an alternative seccomp error action instead of killing
or returning an errno code.
Signed-off-by: Topi Miettinen <toiwoton@gmail.com>
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Let user specify the action when seccomp filters trigger:
- errno name like EPERM (default) or ENOSYS: return errno and let the process continue.
- 'kill': kill the process as previous versions
The default action is EPERM, but killing can still be specified with
syscall:kill syntax or globally with seccomp-error-action=kill. The
action can be also overridden /etc/firejail/firejail.config file.
Not killing the process weakens Firejail slightly when trying to
contain intrusion, but it may also allow tighter filters if the
only alternative is to allow a system call.
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System calls (names and numbers) are not exactly the same for 32 bit
and 64 bit architectures. Let's allow defining separate filters for
32-bit arch using seccomp.32, seccomp.32.drop, seccomp.32.keep. This
is useful for mixed 64/32 bit application environments like Steam and
Wine.
Implement protocol and mdwx filtering also for 32 bit arch. It's still
better to block secondary archs completely if not needed.
Lists of supported system calls are also updated.
Warn if preload libraries would be needed due to trace, tracelog or
postexecseccomp (seccomp.drop=execve etc), because a 32-bit dynamic
linker does not understand the 64 bit preload libraries.
Closes #3267.
Signed-off-by: Topi Miettinen <toiwoton@gmail.com>
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Add a feature for a new (opt-in) command line switch and config file
option to block secondary architectures entirely. Also block changing
Linux execution domain with personality() system call for the primary
architecture.
Closes #1479
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Allow any syscall to be blacklisted with aid of LD_PRELOAD library,
libpostexecseccomp.so.
Closes: #1447
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Feature to block attempts to create writable and executable memory.
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netblue30
startx2017
Topi Miettinen
smitsohu
glitsj16
netblue30
startx2017
Fred Barclay