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Commit 5107af32 by 0x0916
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seccomp: export the seccomp filter after load it into kernel successful

when the log level is TRACE, this patch export the seccomp filter to log file. the ouput of `seccomp_export_pfc()` is human readable and this feature is useful for user to make sure their `seccomp configuration file` is right. Output for he default ubuntu container's seccomp filter is the following: ``` lxc-start ubuntu 20170520024159.412 INFO lxc_apparmor - lsm/apparmor.c:apparmor_process_label_set:238 - changed apparmor profile to lxc-container-default-cgns if ($arch == 3221225534) # filter for syscall "finit_module" (313) [priority: 65535] if ($syscall == 313) action ERRNO(1); # filter for syscall "open_by_handle_at" (304) [priority: 65535] if ($syscall == 304) action ERRNO(1); # filter for syscall "kexec_load" (246) [priority: 65535] if ($syscall == 246) action ERRNO(1); # filter for syscall "delete_module" (176) [priority: 65535] if ($syscall == 176) action ERRNO(1); # filter for syscall "init_module" (175) [priority: 65535] if ($syscall == 175) action ERRNO(1); # filter for syscall "umount2" (166) [priority: 65533] if ($syscall == 166) if ($a1.hi32 & 0x00000000 == 0) if ($a1.lo32 & 0x00000001 == 1) action ERRNO(13); # default action action ALLOW; if ($arch == 1073741827) # filter for syscall "finit_module" (350) [priority: 65535] if ($syscall == 350) action ERRNO(1); # filter for syscall "open_by_handle_at" (342) [priority: 65535] if ($syscall == 342) action ERRNO(1); # filter for syscall "kexec_load" (283) [priority: 65535] if ($syscall == 283) action ERRNO(1); # filter for syscall "delete_module" (129) [priority: 65535] if ($syscall == 129) action ERRNO(1); # filter for syscall "init_module" (128) [priority: 65535] if ($syscall == 128) action ERRNO(1); # filter for syscall "umount2" (52) [priority: 65534] if ($syscall == 52) if ($a1 & 0x00000001 == 1) action ERRNO(13); # default action action ALLOW; if ($arch == 3221225534) # filter for syscall "kexec_load" (1073742352) [priority: 65535] if ($syscall == 1073742352) action ERRNO(1); # filter for syscall "finit_module" (1073742137) [priority: 65535] if ($syscall == 1073742137) action ERRNO(1); # filter for syscall "open_by_handle_at" (1073742128) [priority: 65535] if ($syscall == 1073742128) action ERRNO(1); # filter for syscall "delete_module" (1073742000) [priority: 65535] if ($syscall == 1073742000) action ERRNO(1); # filter for syscall "init_module" (1073741999) [priority: 65535] if ($syscall == 1073741999) action ERRNO(1); # filter for syscall "umount2" (1073741990) [priority: 65534] if ($syscall == 1073741990) if ($a1 & 0x00000001 == 1) action ERRNO(13); # default action action ALLOW; action KILL; lxc-start ubuntu 20170520024159.412 NOTICE lxc_start - start.c:start:1470 - Exec'ing "/sbin/init". ``` Signed-off-by: 's avatar0x0916 <w@laoqinren.net>
parent 78678dc1
Showing with 12 additions and 0 deletions
src/lxc/seccomp.c
......@@ -791,6 +791,18 @@ int lxc_seccomp_load(struct lxc_conf *conf)
ERROR("Error loading the seccomp policy: %s.", strerror(-ret));
return -1;
}
/* After load seccomp filter into the kernel successfully, export the current seccomp
* filter to log file */
#if HAVE_SCMP_FILTER_CTX
if ((lxc_log_get_level() <= LXC_LOG_PRIORITY_TRACE || conf->loglevel <= LXC_LOG_PRIORITY_TRACE) &&
lxc_log_fd >= 0) {
ret = seccomp_export_pfc(conf->seccomp_ctx, lxc_log_fd);
/* Just give an warning when export error */
if (ret < 0)
WARN("Failed to export seccomp filter to log file: %s.", strerror(-ret));
}
#endif
return 0;
}
......
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