The patch titled
Subject: dma-debug: switch check from _text to _stext
has been added to the -mm tree. Its filename is
dma-debug-switch-check-from-_text-to-_stext.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/dma-debug-switch-check-from-_text-to-_stext.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/dma-debug-switch-check-from-_text-to-_stext.patch
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------------------------------------------------------
From: Laura Abbott <labbott@xxxxxxxxxxxxxxxxx>
Subject: dma-debug: switch check from _text to _stext
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>
---
lib/dma-debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN lib/dma-debug.c~dma-debug-switch-check-from-_text-to-_stext lib/dma-debug.c
--- a/lib/dma-debug.c~dma-debug-switch-check-from-_text-to-_stext
+++ a/lib/dma-debug.c
@@ -1181,7 +1181,7 @@ 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 -mm which might be from labbott@xxxxxxxxxxxxxxxxx are
dma-debug-switch-check-from-_text-to-_stext.patch
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