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- Log ----------------------------------------------------------------- commit b7b65e736e42be7e7988c4c3efe67ca0f2a05057 Author: Peter Müller peter.mueller@ipfire.org Date: Mon Oct 5 14:12:18 2020 +0000

sysctl.conf: prevent unintentional writes into attacker-controlled files and FIFOs

Similar to hard- and symlink protection introduced a while ago, this patch enables protections against unintentional writes into attacker-controlled regular files or FIFOs, where a program expected to create new ones. This makes exploiting TOCTOU flaws harder.

See also: https://www.kernel.org/doc/Documentation/sysctl/fs.txt

Signed-off-by: Peter Müller peter.mueller@ipfire.org Signed-off-by: Michael Tremer michael.tremer@ipfire.org

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Summary of changes: config/etc/sysctl.conf | 5 +++++ 1 file changed, 5 insertions(+)

Difference in files: diff --git a/config/etc/sysctl.conf b/config/etc/sysctl.conf index d48c7734e..be7c07c85 100644 --- a/config/etc/sysctl.conf +++ b/config/etc/sysctl.conf @@ -49,6 +49,11 @@ kernel.dmesg_restrict = 1 fs.protected_symlinks = 1 fs.protected_hardlinks = 1

+# Don't allow writes to files and FIFOs that we don't own in world writable sticky +# directories, unless they are owned by the owner of the directory. +fs.protected_fifos = 2 +fs.protected_regular = 2 + # Minimal preemption granularity for CPU-bound tasks: # (default: 1 msec# (1 + ilog(ncpus)), units: nanoseconds) kernel.sched_min_granularity_ns = 10000000

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