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.

---

Changed since v2:
- Added CVE number
- For compatibility with old kernels, don't fail the test if PTRACE_SETREGSET succeeds

 runtest/cve                                 |   1 +
 runtest/syscalls                            |   1 +
 testcases/kernel/syscalls/.gitignore        |   1 +
 testcases/kernel/syscalls/ptrace/ptrace07.c | 176 ++++++++++++++++++++++++++++
 4 files changed, 179 insertions(+)
 create mode 100644 testcases/kernel/syscalls/ptrace/ptrace07.c

index d182e592a..1bea38dfd 100644
@@ -18,4 +18,5 @@ cve-2017-5669 cve-2017-5669
 cve-2017-6951 cve-2017-6951
 cve-2017-7472 keyctl04
 cve-2017-15274 add_key02
+cve-2017-15537 ptrace07
 cve-2017-1000364 stack_clash

index 780db6694..5d4312d2e 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 2d17125d6..37c38058b 100644
@@ -705,6 +705,7 @@
 /ptrace/ptrace03
 /ptrace/ptrace04
 /ptrace/ptrace05
+/ptrace/ptrace07
 /ptrace/simple_tracer
 /pwrite/f
 /pwrite/pwrite01

2.15.0.rc1.287.g2b38de12cc-goog

Hi!
Pushed, thanks.

Cyril Hrubis
[email protected]