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From 74061958f56a4626a3a146c72f16e43012e828f1 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Thu, 14 Sep 2017 15:39:23 +0200
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Subject: [PATCH] netns: avoid directory traversal
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1468529
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Upstream Status: iproute2.git commit 79928fd0552b5
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commit 79928fd0552b520aa36a22e71144d10a32f7e4fe
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Author: Matteo Croce <mcroce@redhat.com>
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Date: Thu Jul 20 00:36:32 2017 +0200
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netns: avoid directory traversal
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ip netns keeps track of created namespaces with bind mounts named
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/var/run/netns/<namespace>. No input sanitization is done, allowing creation and
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deletion of files relatives to /var/run/netns or, if the path is non existent or
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invalid, allows to create "untracked" namespaces (invisible to the tool).
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This commit denies creation or deletion of namespaces with names contaning
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"/" or matching exactly "." or "..".
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Signed-off-by: Matteo Croce <mcroce@redhat.com>
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---
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ip/ipnetns.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/ip/ipnetns.c b/ip/ipnetns.c
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index 0b0378ab6560c..4254994442ccd 100644
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--- a/ip/ipnetns.c
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+++ b/ip/ipnetns.c
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@@ -766,6 +766,11 @@ static int netns_monitor(int argc, char **argv)
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return 0;
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}
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+static int invalid_name(const char *name)
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+{
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+ return strchr(name, '/') || !strcmp(name, ".") || !strcmp(name, "..");
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+}
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+
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int do_netns(int argc, char **argv)
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{
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netns_nsid_socket_init();
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@@ -775,6 +780,11 @@ int do_netns(int argc, char **argv)
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return netns_list(0, NULL);
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}
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+ if (argc > 1 && invalid_name(argv[1])) {
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+ fprintf(stderr, "Invalid netns name \"%s\"\n", argv[1]);
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+ exit(-1);
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+ }
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+
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if ((matches(*argv, "list") == 0) || (matches(*argv, "show") == 0) ||
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(matches(*argv, "lst") == 0)) {
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netns_map_init();
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--
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2.21.0
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