This is a note to let you know that I've just added the patch titled
dma-debug: switch check from _text to _stext
to the 3.10-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:
dma-debug-switch-check-from-_text-to-_stext.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ea535e418c01837d07b6c94e817540f50bfdadb0 Mon Sep 17 00:00:00 2001
From: Laura Abbott <labbott@xxxxxxxxxxxxxxxxx>
Date: Thu, 14 Jan 2016 15:16:50 -0800
Subject: dma-debug: switch check from _text to _stext
From: Laura Abbott <labbott@xxxxxxxxxxxxxxxxx>
commit ea535e418c01837d07b6c94e817540f50bfdadb0 upstream.
In include/asm-generic/sections.h:
/*
* Usage guidelines:
* _text, _data: architecture specific, don't use them in
* arch-independent code
* [_stext, _etext]: contains .text.* sections, may also contain
* .rodata.*
* and/or .init.* sections
_text is not guaranteed across architectures. Architectures such as ARM
may reuse parts which are not actually text and erroneously trigger a bug.
Switch to using _stext which is guaranteed to contain text sections.
Came out of https://lkml.kernel.org/g/<567B1176.4000106@xxxxxxxxxx>
Signed-off-by: Laura Abbott <labbott@xxxxxxxxxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
lib/dma-debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -962,7 +962,7 @@ static inline bool overlap(void *addr, u
static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
{
- if (overlap(addr, len, _text, _etext) ||
+ if (overlap(addr, len, _stext, _etext) ||
overlap(addr, len, __start_rodata, __end_rodata))
err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len);
}
Patches currently in stable-queue which might be from labbott@xxxxxxxxxxxxxxxxx are
queue-3.10/dma-debug-switch-check-from-_text-to-_stext.patch
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