The patch titled
Subject: mm/memory.c: actually remap enough memory
has been added to the -mm tree. Its filename is
mm-actually-remap-enough-memory.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-actually-remap-enough-memory.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-actually-remap-enough-memory.patch
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------------------------------------------------------
From: Grazvydas Ignotas <notasas@xxxxxxxxx>
Subject: mm/memory.c: actually remap enough memory
For whatever reason, generic_access_phys() only remaps one page, but
actually allows to access arbitrary size. It's quite easy to trigger
large reads, like printing out large structure with gdb, which leads to a
crash. Fix it by remapping correct size.
Fixes: 28b2ee20c7cb ("access_process_vm device memory infrastructure")
Signed-off-by: Grazvydas Ignotas <notasas@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/memory.c~mm-actually-remap-enough-memory mm/memory.c
--- a/mm/memory.c~mm-actually-remap-enough-memory
+++ a/mm/memory.c
@@ -3460,7 +3460,7 @@ int generic_access_phys(struct vm_area_s
if (follow_phys(vma, addr, write, &prot, &phys_addr))
return -EINVAL;
- maddr = ioremap_prot(phys_addr, PAGE_SIZE, prot);
+ maddr = ioremap_prot(phys_addr, PAGE_ALIGN(len + offset), prot);
if (write)
memcpy_toio(maddr + offset, buf, len);
else
_
Patches currently in -mm which might be from notasas@xxxxxxxxx are
mm-actually-remap-enough-memory.patch
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