kexec_file: adjust declaration of kexec_purgatory
authorKees Cook <keescook@chromium.org>
Wed, 12 Jul 2017 21:35:58 +0000 (14:35 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 12 Jul 2017 23:26:02 +0000 (16:26 -0700)
commite2ae8ab4b571e2e4094a28acb60649bc2732c67f
tree37ef8802e03e3e416be96534618a718833287d0e
parent3e2c044a54e6b6373606f8ffad42a4a0759fcf3d
kexec_file: adjust declaration of kexec_purgatory

Defining kexec_purgatory as a zero-length char array upsets compile time
size checking.  Since this is built on a per-arch basis, define it as an
unsized char array (like is done for other similar things, e.g.  linker
sections).  This silences the warning generated by the future
CONFIG_FORTIFY_SOURCE, which did not like the memcmp() of a "0 byte"
array.  This drops the __weak and uses an extern instead, since both
users define kexec_purgatory.

Link: http://lkml.kernel.org/r/1497903987-21002-4-git-send-email-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Daniel Micay <danielmicay@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/kexec_file.c
kernel/kexec_internal.h