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seccomp: add elevateprivileges argument to command line

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This patch introduces the new argument
[,elevateprivileges=allow|deny|children] to the `-sandbox on'. It allows
or denies Qemu process to elevate its privileges by blacklisting all
set*uid|gid system calls. The 'children' option will let forks and
execves run unprivileged.

Signed-off-by: Eduardo Otubo <otubo@redhat.com>
This commit is contained in:
Eduardo Otubo 2017-03-13 22:13:27 +01:00
parent 2b716fa6d6
commit 73a1e64725
4 changed files with 48 additions and 3 deletions
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11
qemu-seccomp.c
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@ -67,6 +67,17 @@ static const struct QemuSeccompSyscall blacklist[] = {
{ SCMP_SYS(sysfs), QEMU_SECCOMP_SET_OBSOLETE },
{ SCMP_SYS(uselib), QEMU_SECCOMP_SET_OBSOLETE },
{ SCMP_SYS(ustat), QEMU_SECCOMP_SET_OBSOLETE },
/* privileged */
{ SCMP_SYS(setuid), QEMU_SECCOMP_SET_PRIVILEGED },
{ SCMP_SYS(setgid), QEMU_SECCOMP_SET_PRIVILEGED },
{ SCMP_SYS(setpgid), QEMU_SECCOMP_SET_PRIVILEGED },
{ SCMP_SYS(setsid), QEMU_SECCOMP_SET_PRIVILEGED },
{ SCMP_SYS(setreuid), QEMU_SECCOMP_SET_PRIVILEGED },
{ SCMP_SYS(setregid), QEMU_SECCOMP_SET_PRIVILEGED },
{ SCMP_SYS(setresuid), QEMU_SECCOMP_SET_PRIVILEGED },
{ SCMP_SYS(setresgid), QEMU_SECCOMP_SET_PRIVILEGED },
{ SCMP_SYS(setfsuid), QEMU_SECCOMP_SET_PRIVILEGED },
{ SCMP_SYS(setfsgid), QEMU_SECCOMP_SET_PRIVILEGED },
};