diff options
| author | Laura Abbott <labbott@fedoraproject.org> | 2016-01-14 15:16:50 -0800 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-02-03 16:23:16 -0500 |
| commit | 68cc9774de3e0ad8de67d6fbbdaf4a808cbc62a9 (patch) | |
| tree | 181be1b6ab094ff09903aa66496c2a8fef6df386 /lib | |
| parent | a5254ac06b9aaf6ef99bb260fe713f6a64371353 (diff) | |
dma-debug: switch check from _text to _stext
[ Upstream commit ea535e418c01837d07b6c94e817540f50bfdadb0 ]
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@redhat.com>
Signed-off-by: Laura Abbott <labbott@fedoraproject.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/dma-debug.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c index dace71fe41f7..517a568f038d 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -1181,7 +1181,7 @@ static inline bool overlap(void *addr, unsigned long len, void *start, void *end 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); } |