diff options
| author | Tkhai Kirill <tkhai@yandex.ru> | 2011-05-10 04:31:41 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-05-12 06:35:04 +0200 |
| commit | b1054282d752c5a026e2c0450616ebf37fc0413e (patch) | |
| tree | d88dcef782fc8e33674109c5c82fb37f2829abdc /arch/sparc/lib/checksum_32.S | |
| parent | sparc32: fix sparcstation 5 boot (diff) | |
| download | linux-b1054282d752c5a026e2c0450616ebf37fc0413e.tar.xz linux-b1054282d752c5a026e2c0450616ebf37fc0413e.zip | |
sparc32: Fixed unaligned memory copying in function __csum_partial_copy_sparc_generic
When we are in the label cc_dword_align, registers %o0 and %o1 have the same last 2 bits,
but it's not guaranteed one of them is zero. So we can get unaligned memory access
in label ccte. Example of parameters which lead to this:
%o0=0x7ff183e9, %o1=0x8e709e7d, %g1=3
With the parameters I had a memory corruption, when the additional 5 bytes were rewritten.
This patch corrects the error.
One comment to the patch. We don't care about the third bit in %o1, because cc_end_cruft
stores word or less.
Signed-off-by: Tkhai Kirill <tkhai@yandex.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/lib/checksum_32.S')
| -rw-r--r-- | arch/sparc/lib/checksum_32.S | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/sparc/lib/checksum_32.S b/arch/sparc/lib/checksum_32.S index 3632cb34e914..0084c3361e15 100644 --- a/arch/sparc/lib/checksum_32.S +++ b/arch/sparc/lib/checksum_32.S @@ -289,10 +289,16 @@ cc_end_cruft: /* Also, handle the alignment code out of band. */ cc_dword_align: - cmp %g1, 6 - bl,a ccte + cmp %g1, 16 + bge 1f + srl %g1, 1, %o3 +2: cmp %o3, 0 + be,a ccte andcc %g1, 0xf, %o3 - andcc %o0, 0x1, %g0 + andcc %o3, %o0, %g0 ! Check %o0 only (%o1 has the same last 2 bits) + be,a 2b + srl %o3, 1, %o3 +1: andcc %o0, 0x1, %g0 bne ccslow andcc %o0, 0x2, %g0 be 1f |