linux-kernel - [PATCH 3.12 191/235] arm64/ptrace: Reject attempts to set incomplete hardware breakpoint fields

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Date:   Fri, 27 Jan 2017 11:55:24 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dave Martin <Dave.Martin@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 191/235] arm64/ptrace: Reject attempts to set incomplete hardware breakpoint fields

From: Dave Martin <Dave.Martin@....com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit ad9e202aa1ce571b1d7fed969d06f66067f8a086 upstream.

We cannot preserve partial fields for hardware breakpoints, because
the values written by userspace to the hardware breakpoint
registers can't subsequently be recovered intact from the hardware.

So, just reject attempts to write incomplete fields with -EINVAL.

Fixes: 478fcb2cdb23 ("arm64: Debugging support")
Signed-off-by: Dave Martin <Dave.Martin@....com>
Acked-by: Will Deacon <Will.Deacon@....com>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/arm64/kernel/ptrace.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 076bd41bf5ac..cdf1ec11c015 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -442,6 +442,8 @@ static int hw_break_set(struct task_struct *target,
 	/* (address, ctrl) registers */
 	limit = regset->n * regset->size;
 	while (count && offset < limit) {
+		if (count < PTRACE_HBP_ADDR_SZ)
+			return -EINVAL;
 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
 					 offset, offset + PTRACE_HBP_ADDR_SZ);
 		if (ret)
@@ -451,6 +453,8 @@ static int hw_break_set(struct task_struct *target,
 			return ret;
 		offset += PTRACE_HBP_ADDR_SZ;
 
+		if (!count)
+			break;
 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
 					 offset, offset + PTRACE_HBP_CTRL_SZ);
 		if (ret)
-- 
2.11.0