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seccomp: block setns, unshare and execveat syscalls 

setns/unshare are used to change namespaces which is not something QEMU
needs to be able todo.

execveat is a new variant of execve so should be blocked just like
execve already is.

Acked-by: Eduardo Otubo <otubo@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2021-04-29 11:25:13 +01:00
parent c542b30270
commit 4638057110
1 changed files with 5 additions and 0 deletions
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5
softmmu/qemu-seccomp.c
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@ -248,6 +248,11 @@ static const struct QemuSeccompSyscall denylist[] = {
{ SCMP_SYS(clone3), QEMU_SECCOMP_SET_SPAWN,
0, NULL, SCMP_ACT_ERRNO(ENOSYS) },
#endif
#ifdef __SNR_execveat
{ SCMP_SYS(execveat), QEMU_SECCOMP_SET_SPAWN },
#endif
{ SCMP_SYS(setns), QEMU_SECCOMP_SET_SPAWN },
{ SCMP_SYS(unshare), QEMU_SECCOMP_SET_SPAWN },
/* resource control */
{ SCMP_SYS(setpriority), QEMU_SECCOMP_SET_RESOURCECTL,
0, NULL, SCMP_ACT_ERRNO(EPERM) },