This is a note to let you know that I've just added the patch titled
m68k/atari: ARAnyM - Fix NatFeat module support
to the 3.0-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:
m68k-atari-aranym-fix-natfeat-module-support.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e8184e10f89736a23ea6eea8e24cd524c5c513d2 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Date: Fri, 26 Jul 2013 00:08:25 +0200
Subject: m68k/atari: ARAnyM - Fix NatFeat module support
From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
commit e8184e10f89736a23ea6eea8e24cd524c5c513d2 upstream.
As pointed out by Andreas Schwab, pointers passed to ARAnyM NatFeat calls
should be physical addresses, not virtual addresses.
Fortunately on Atari, physical and virtual kernel addresses are the same,
as long as normal kernel memory is concerned, so this usually worked fine
without conversion.
But for modules, pointers to literal strings are located in vmalloc()ed
memory. Depending on the version of ARAnyM, this causes the nf_get_id()
call to just fail, or worse, crash ARAnyM itself with e.g.
Gotcha! Illegal memory access. Atari PC = $968c
This is a big issue for distro kernels, who want to have all drivers as
loadable modules in an initrd.
Add a wrapper for nf_get_id() that copies the literal to the stack to
work around this issue.
Reported-by: Thorsten Glaser <tg@xxxxxxxxxx>
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/m68k/emu/natfeat.c | 23 +++++++++++++++++++----
1 file changed, 19 insertions(+), 4 deletions(-)
--- a/arch/m68k/emu/natfeat.c
+++ b/arch/m68k/emu/natfeat.c
@@ -18,9 +18,11 @@
#include <asm/machdep.h>
#include <asm/natfeat.h>
+extern long nf_get_id2(const char *feature_name);
+
asm("\n"
-" .global nf_get_id,nf_call\n"
-"nf_get_id:\n"
+" .global nf_get_id2,nf_call\n"
+"nf_get_id2:\n"
" .short 0x7300\n"
" rts\n"
"nf_call:\n"
@@ -29,12 +31,25 @@ asm("\n"
"1: moveq.l #0,%d0\n"
" rts\n"
" .section __ex_table,\"a\"\n"
-" .long nf_get_id,1b\n"
+" .long nf_get_id2,1b\n"
" .long nf_call,1b\n"
" .previous");
-EXPORT_SYMBOL_GPL(nf_get_id);
EXPORT_SYMBOL_GPL(nf_call);
+long nf_get_id(const char *feature_name)
+{
+ /* feature_name may be in vmalloc()ed memory, so make a copy */
+ char name_copy[32];
+ size_t n;
+
+ n = strlcpy(name_copy, feature_name, sizeof(name_copy));
+ if (n >= sizeof(name_copy))
+ return 0;
+
+ return nf_get_id2(name_copy);
+}
+EXPORT_SYMBOL_GPL(nf_get_id);
+
void nfprint(const char *fmt, ...)
{
static char buf[256];
Patches currently in stable-queue which might be from geert@xxxxxxxxxxxxxx are
queue-3.0/m68k-atari-aranym-fix-natfeat-module-support.patch
queue-3.0/cris-add-_sdata-to-vmlinux.lds.s.patch
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