tree 2c77ae76f8f8cb27823d1c0cf3d2044f78342a08
parent 52909b4b3a1c8058883d6537e1b968a3c47f394e
author Ben Zhang <benzh@chromium.org> 1414714461 -0700
committer Steve Fung <stevefung@google.com> 1454540895 -0800

pstore/ram: Strip ramoops header for correct decompression

pstore compression/decompression was added during 3.12.
The ramoops driver prepends a "====timestamp.timestamp-C|D\n"
header to the compressed record before handing it over to pstore
driver which doesn't know about the header. In pstore_decompress(),
the pstore driver reads the first "==" as a zlib header, so the
decompression always fails. For example, this causes the driver
to write /dev/pstore/dmesg-ramoops-0.enc.z instead of
/dev/pstore/dmesg-ramoops-0.

This patch makes the ramoops driver remove the header before
pstore decompression.

Signed-off-by: Ben Zhang <benzh@chromium.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>