Patch "parisc: Fix and enable seccomp filter support" has been added to the 4.5-stable tree

This is a note to let you know that I've just added the patch titled

parisc: Fix and enable seccomp filter support

to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
parisc-fix-and-enable-seccomp-filter-support.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Helge Deller <[email protected]>
Date: Wed, 30 Mar 2016 14:14:31 +0200
Subject: parisc: Fix and enable seccomp filter support

From: Helge Deller <[email protected]>

commit 910cd32e552ea09caa89cdbe328e468979b030dd upstream.

The seccomp filter support requires careful handling of task registers. This includes reloading of the return value (%r28) and proper syscall exit if secure_computing() returned -1.

Additionally we need to sign-extend the syscall number from signed 32bit to signed 64bit in do_syscall_trace_enter() since the ptrace interface only allows storing 32bit values in compat mode.

---
 arch/parisc/Kconfig               |    1 +
 arch/parisc/include/asm/syscall.h |   13 +++++++++++++
 arch/parisc/kernel/ptrace.c       |    9 +++++++--
 arch/parisc/kernel/syscall.S      |    2 ++
 4 files changed, 23 insertions(+), 2 deletions(-)

@@ -29,6 +29,7 @@ config PARISC
 	select TTY # Needed for pdc_cons.c
 	select HAVE_DEBUG_STACKOVERFLOW
 	select HAVE_ARCH_AUDITSYSCALL
+	select HAVE_ARCH_SECCOMP_FILTER
 	select ARCH_NO_COHERENT_DMA_MMAP
 
 	help

@@ -39,6 +39,19 @@ static inline void syscall_get_arguments
 	}
 }
 
+static inline void syscall_set_return_value(struct task_struct *task,
+					    struct pt_regs *regs,
+					    int error, long val)
+{
+	regs->gr[28] = error ? error : val;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+				    struct pt_regs *regs)
+{
+	/* do nothing */
+}
+
 static inline int syscall_get_arch(void)
 {
 	int arch = AUDIT_ARCH_PARISC;

@@ -270,7 +270,8 @@ long compat_arch_ptrace(struct task_stru
 long do_syscall_trace_enter(struct pt_regs *regs)
 {
 	/* Do the secure computing check first. */
-	secure_computing_strict(regs->gr[20]);
+	if (secure_computing() == -1)
+		return -1;
 
 	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
 	    tracehook_report_syscall_entry(regs)) {

@@ -296,7 +297,11 @@ long do_syscall_trace_enter(struct pt_re
 			regs->gr[23] & 0xffffffff);
 
 out:
-	return regs->gr[20];
+	/*
+	 * Sign extend the syscall number to 64bit since it may have been
+	 * modified by a compat ptrace call
+	 */
+	return (int) ((u32) regs->gr[20]);
 }
 
 void do_syscall_trace_exit(struct pt_regs *regs)

@@ -329,6 +329,7 @@ tracesys_next:
 
 	ldo     -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1      /* get task ptr */
 	LDREG	TI_TASK(%r1), %r1
+	LDREG   TASK_PT_GR28(%r1), %r28		/* Restore return value */
 	LDREG   TASK_PT_GR26(%r1), %r26		/* Restore the users args */
 	LDREG   TASK_PT_GR25(%r1), %r25
 	LDREG   TASK_PT_GR24(%r1), %r24

@@ -342,6 +343,7 @@ tracesys_next:
 	stw     %r21, -56(%r30)                 /* 6th argument */
 #endif
 
+	cmpib,COND(=),n -1,%r20,tracesys_exit /* seccomp may have returned -1 */
 	comiclr,>>=	__NR_Linux_syscalls, %r20, %r0
 	b,n	.Ltracesys_nosys
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.5/parisc-fix-kernel-crash-with-reversed-copy_from_user.patch queue-4.5/parisc-unbreak-handling-exceptions-from-kernel-modules.patch queue-4.5/parisc-avoid-function-pointers-for-kernel-exception-routines.patch queue-4.5/parisc-fix-and-enable-seccomp-filter-support.patch queue-4.5/parisc-fix-sigsys-signals-in-compat-case.patch