linux-kernel - [PATCH 3.12 51/60] s390: TASK

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Message-Id: <1e41ada4c4523aea6a7cb84041768a4e2c507111.1489497268.git.jslaby@suse.cz>
Date:   Tue, 14 Mar 2017 14:15:42 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 51/60] s390: TASK_SIZE for kernel threads

From: Martin Schwidefsky <schwidefsky@...ibm.com>

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

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

commit fb94a687d96c570d46332a4a890f1dcb7310e643 upstream.

Return a sensible value if TASK_SIZE if called from a kernel thread.

This gets us around an issue with copy_mount_options that does a magic
size calculation "TASK_SIZE - (unsigned long)data" while in a kernel
thread and data pointing to kernel space.

Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/s390/include/asm/processor.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index ca7821f07260..a42a05322d25 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -48,7 +48,8 @@ extern void execve_tail(void);
 
 #else /* CONFIG_64BIT */
 
-#define TASK_SIZE_OF(tsk)	((tsk)->mm->context.asce_limit)
+#define TASK_SIZE_OF(tsk)	((tsk)->mm ? \
+				 (tsk)->mm->context.asce_limit : TASK_MAX_SIZE)
 #define TASK_UNMAPPED_BASE	(test_thread_flag(TIF_31BIT) ? \
 					(1UL << 30) : (1UL << 41))
 #define TASK_SIZE		TASK_SIZE_OF(current)
-- 
2.12.0