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-rw-r--r--isolation.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/isolation.c b/isolation.c
index 19932bf..1866724 100644
--- a/isolation.c
+++ b/isolation.c
@@ -202,9 +202,11 @@ void isolate_initial(void)
* a mapping from UID 0, which only happens with pasta spawning a child
* from a non-init user namespace (pasta can't run as root), we need to
* retain CAP_SETFCAP too.
+ * We also need to keep CAP_SYS_PTRACE in order to join an existing netns
+ * path under /proc/$pid/ns/net which was created in the same userns.
*/
if (!ns_is_init() && !geteuid())
- keep |= BIT(CAP_SETFCAP);
+ keep |= BIT(CAP_SETFCAP) | BIT(CAP_SYS_PTRACE);
drop_caps_ep_except(keep);
}