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Merge pull request #891 from bergwolf/CVE-2016-9962

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agent: set init process non-dumpable
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Fupan Li 2020-10-09 19:03:24 +08:00 committed by GitHub
commit 3a659a6733
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1 changed files with 18 additions and 0 deletions
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18
src/agent/rustjail/src/container.rs
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@ -456,6 +456,24 @@ fn do_init_child(cwfd: RawFd) -> Result<()> {
setrlimit(rl)?;
}
//
// Make the process non-dumpable, to avoid various race conditions that
// could cause processes in namespaces we're joining to access host
// resources (or potentially execute code).
//
// However, if the number of namespaces we are joining is 0, we are not
// going to be switching to a different security context. Thus setting
// ourselves to be non-dumpable only breaks things (like rootless
// containers), which is the recommendation from the kernel folks.
//
// Ref: https://github.com/opencontainers/runc/commit/50a19c6ff828c58e5dab13830bd3dacde268afe5
//
if !nses.is_empty() {
if let Err(e) = prctl::set_dumpable(false) {
return Err(anyhow!(e).context("set process non-dumpable failed"));
};
}
if userns {
log_child!(cfd_log, "enter new user namespace");
sched::unshare(CloneFlags::CLONE_NEWUSER)?;