syscalls/ptrace07: new test for ptrace FPU state corruption

From: Eric Biggers <[email protected]>

Add a test for a bug which allowed a task to be assigned an invalid FPU state, causing the FPU registers to not be restored on context switch.

---
 runtest/syscalls                            |   1 +
 testcases/kernel/syscalls/.gitignore        |   1 +
 testcases/kernel/syscalls/ptrace/ptrace07.c | 167 ++++++++++++++++++++++++++++
 3 files changed, 169 insertions(+)
 create mode 100644 testcases/kernel/syscalls/ptrace/ptrace07.c

index 49ae48621..c2f4921ef 100644
@@ -843,6 +843,7 @@ ptrace04 ptrace04
 ptrace05 ptrace05
 # Broken test; See: testcases/kernel/syscalls/ptrace/Makefile for more details.
 #ptrace06 ptrace06
+ptrace07 ptrace07
 
 pwrite01 pwrite01
 pwrite02 pwrite02

index 76bae9e4a..5b9c5d93f 100644
@@ -705,6 +705,7 @@
 /ptrace/ptrace03
 /ptrace/ptrace04
 /ptrace/ptrace05
+/ptrace/ptrace07
 /ptrace/simple_tracer
 /pwrite/f
 /pwrite/pwrite01

2.15.0.rc0.271.g36b669edcc-goog