linux-kernel - [PATCH 5.2 19/61] x86/ptrace: Fix possible spectre-v1 in ptrace_get

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Date:   Fri, 12 Jul 2019 14:19:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dianzhang Chen <dianzhangchen0@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>, bp@...en8.de,
        hpa@...or.com
Subject: [PATCH 5.2 19/61] x86/ptrace: Fix possible spectre-v1 in ptrace_get_debugreg()

From: Dianzhang Chen <dianzhangchen0@...il.com>

commit 31a2fbb390fee4231281b939e1979e810f945415 upstream.

The index to access the threads ptrace_bps is controlled by userspace via
syscall: sys_ptrace(), hence leading to a potential exploitation of the
Spectre variant 1 vulnerability.

The index can be controlled from:
    ptrace -> arch_ptrace -> ptrace_get_debugreg.

Fix this by sanitizing the user supplied index before using it access
thread->ptrace_bps.

Signed-off-by: Dianzhang Chen <dianzhangchen0@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: bp@...en8.de
Cc: hpa@...or.com
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/1561476617-3759-1-git-send-email-dianzhangchen0@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/kernel/ptrace.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -25,6 +25,7 @@
 #include <linux/rcupdate.h>
 #include <linux/export.h>
 #include <linux/context_tracking.h>
+#include <linux/nospec.h>
 
 #include <linux/uaccess.h>
 #include <asm/pgtable.h>
@@ -643,9 +644,11 @@ static unsigned long ptrace_get_debugreg
 {
 	struct thread_struct *thread = &tsk->thread;
 	unsigned long val = 0;
+	int index = n;
 
 	if (n < HBP_NUM) {
-		struct perf_event *bp = thread->ptrace_bps[n];
+		index = array_index_nospec(index, HBP_NUM);
+		struct perf_event *bp = thread->ptrace_bps[index];
 
 		if (bp)
 			val = bp->hw.info.address;