From 8c9a134cae6f8d66f35321b07baa202f75ef2199 Mon Sep 17 00:00:00 2001 From: Kees Cook <keescook@chromium.org> Date: Tue, 21 Aug 2018 21:53:10 -0700 Subject: mm: clarify CONFIG_PAGE_POISONING and usage The Kconfig text for CONFIG_PAGE_POISONING doesn't mention that it has to be enabled explicitly. This updates the documentation for that and adds a note about CONFIG_PAGE_POISONING to the "page_poison" command line docs. While here, change description of CONFIG_PAGE_POISONING_ZERO too, as it's not "random" data, but rather the fixed debugging value that would be used when not zeroing. Additionally removes a stray "bool" in the Kconfig. Link: http://lkml.kernel.org/r/20180725223832.GA43733@beast Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Laura Abbott <labbott@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- Documentation/admin-guide/kernel-parameters.txt | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'Documentation') diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index bffb0caa3693..970d837bd57f 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3041,8 +3041,9 @@ on: enable the feature page_poison= [KNL] Boot-time parameter changing the state of - poisoning on the buddy allocator. - off: turn off poisoning + poisoning on the buddy allocator, available with + CONFIG_PAGE_POISONING=y. + off: turn off poisoning (default) on: turn on poisoning panic= [KNL] Kernel behaviour on panic: delay <timeout> -- cgit v1.2.3