linux-kernel - [PATCH 3.12 032/111] powerpc/mm: Fix mmap errno when MAP_FIXED is set and mapping exceeds the allowed address space

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Message-Id: <ec61e07b4192d5bbc5fb3ef80d7e6e36e09ddf57.1433943052.git.jslaby@suse.cz>
Date:	Wed, 10 Jun 2015 17:26:21 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	"jmarchan@...hat.com" <jmarchan@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 032/111] powerpc/mm: Fix mmap errno when MAP_FIXED is set and mapping exceeds the allowed address space

From: "jmarchan@...hat.com" <jmarchan@...hat.com>

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

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

commit 19751c07b3728748c1253627ce94e6906fa5e273 upstream.

According to Posix, if MAP_FIXED is specified mmap shall set ENOMEM if
the requested mapping exceeds the allowed range for address space of
the process. The generic code set it right, but the specific powerpc
slice_get_unmapped_area() function currently returns -EINVAL in that
case.
This patch corrects it.

Signed-off-by: Jerome Marchand <jmarchan@...hat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/powerpc/mm/slice.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index 7ce9cf3b6988..b0c75cc15efc 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -408,7 +408,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
 	if (fixed && (addr & ((1ul << pshift) - 1)))
 		return -EINVAL;
 	if (fixed && addr > (mm->task_size - len))
-		return -EINVAL;
+		return -ENOMEM;
 
 	/* If hint, make sure it matches our alignment restrictions */
 	if (!fixed && addr) {
-- 
2.4.2

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