kexec: extend KCORE_ELF_HEADERS_SIZE for large memory

A customer has seen the kexec command exhaust its buffer for the ELF headers
from /proc/kcore.  It found 147 program headers, which requires a buffer of
over 8k.
(This overflow was on an SGI UV with an extremely large memory, hence
 many ram ranges.)
The default buffer size of 4k is configured in KCORE_ELF_HEADERS_SIZE.

The easy solution would probably be to increase the buffer to 16k.
That is room for 291 entries, on x86_64.

You might want to make the command dynamically enlarge the buffer when
it is found to be too small, but I don't think this command's use of a
little more memory is of concern.  So there is probably no reason to
change the program logic in this area.

Diffed against kexec-tools-2.0.2

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

0 files changed, 0 insertions, 0 deletions