Messages in this thread | | | From | Christian Brauner <> | Subject | Re: [PATCH v3 1/2] exec: add PR_HIDE_SELF_EXE prctl | Date | Fri, 27 Jan 2023 13:31:13 +0100 |
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From: Christian Brauner (Microsoft) <brauner@kernel.org>
On Fri, 20 Jan 2023 11:25:11 +0100, Giuseppe Scrivano wrote: > This patch adds a new prctl called PR_HIDE_SELF_EXE which allows > processes to hide their own /proc/*/exe file. When this prctl is > used, every access to /proc/*/exe for the calling process will > fail with ENOENT. > > This is useful for preventing issues like CVE-2019-5736, where an > attacker can gain host root access by overwriting the binary > in OCI runtimes through file-descriptor mishandling in containers. > > [...]
Only needed for privileged sandboxes. The userspace mitigations Aleksa and I did for the CVE in all affected runtimes back then are nifty but complicated. The patch is a decent compromise. Picking up this prctl() for now,
[1/2] exec: add PR_HIDE_SELF_EXE prctl commit: 673301182d473ef61a98c292cf64650c73117172 [2/2] selftests: add tests for prctl(SET_HIDE_SELF_EXE) commit: bafa339eda3f79d567386e1fae59bb0537156c96
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