syscalls/add_key03: new test for forging user keyrings

From: Eric Biggers <[email protected]>

Add a test for a bug which allowed a user to create the user and user session keyrings for another user.

---
 runtest/syscalls                              |   1 +
 testcases/kernel/syscalls/.gitignore          |   1 +
 testcases/kernel/syscalls/add_key/add_key03.c | 122 ++++++++++++++++++++++++++
 3 files changed, 124 insertions(+)
 create mode 100644 testcases/kernel/syscalls/add_key/add_key03.c

index 649dbfa6c..0d2254393 100644
@@ -13,6 +13,7 @@ acct01 acct01
 
 add_key01 add_key01
 add_key02 add_key02
+add_key03 add_key03
 
 adjtimex01 adjtimex01
 adjtimex02 adjtimex02

index 53ad7ca2b..7dea3b2c7 100644
@@ -8,6 +8,7 @@
 /acct/acct01
 /add_key/add_key01
 /add_key/add_key02
+/add_key/add_key03
 /adjtimex/adjtimex01
 /adjtimex/adjtimex02
 /alarm/alarm01

2.14.2.920.gcf0c67979c-goog