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seccomp: permit specifying multiple errnos for a syscall

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If more than one errno is specified for a syscall in SystemCallFilter=,
use the last one instead of reporting an error. This is especially
useful when used with system call sets:

    SystemCallFilter=@privileged:EPERM @reboot

This will block any system call requiring super-user capabilities with
EPERM, except for attempts to reboot the system, which will immediately
terminate the process. (@reboot is included in @privileged.)

This also effectively fixes #9939, since specifying different errnos for
“the same syscall” (same pseudo syscall number) is no longer an error.
This commit is contained in:
Lucas Werkmeister 2018-08-29 21:35:38 +02:00
parent 851ee70a3d
commit 9d7fe7c65a
1 changed files with 2 additions and 4 deletions
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6
src/shared/seccomp-util.c
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@ -1061,10 +1061,8 @@ int seccomp_parse_syscall_filter_full(
case -ENOMEM:
return flags & SECCOMP_PARSE_LOG ? log_oom() : -ENOMEM;
case -EEXIST:
if (flags & SECCOMP_PARSE_LOG)
log_warning("System call %s already blocked with different errno: %d",
name, PTR_TO_INT(hashmap_get(filter, INT_TO_PTR(id + 1))));
return -EINVAL;
assert_se(hashmap_update(filter, INT_TO_PTR(id + 1), INT_TO_PTR(errno_num)) == 0);
break;
default:
return r;
}