This is a note to let you know that I've just added the patch titled
mm/page_alloc: Remove kernel address exposure in free_reserved_area()
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-page_alloc-remove-kernel-address-exposure-in-free_reserved_area.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From adb1fe9ae2ee6ef6bc10f3d5a588020e7664dfa7 Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Date: Tue, 25 Oct 2016 09:51:14 -0500
Subject: mm/page_alloc: Remove kernel address exposure in free_reserved_area()
From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
commit adb1fe9ae2ee6ef6bc10f3d5a588020e7664dfa7 upstream.
Linus suggested we try to remove some of the low-hanging fruit related
to kernel address exposure in dmesg. The only leaks I see on my local
system are:
Freeing SMP alternatives memory: 32K (ffffffff9e309000 - ffffffff9e311000)
Freeing initrd memory: 10588K (ffffa0b736b42000 - ffffa0b737599000)
Freeing unused kernel memory: 3592K (ffffffff9df87000 - ffffffff9e309000)
Freeing unused kernel memory: 1352K (ffffa0b7288ae000 - ffffa0b728a00000)
Freeing unused kernel memory: 632K (ffffa0b728d62000 - ffffa0b728e00000)
Linus says:
"I suspect we should just remove [the addresses in the 'Freeing'
messages]. I'm sure they are useful in theory, but I suspect they
were more useful back when the whole "free init memory" was
originally done.
These days, if we have a use-after-free, I suspect the init-mem
situation is the easiest situation by far. Compared to all the dynamic
allocations which are much more likely to show it anyway. So having
debug output for that case is likely not all that productive."
With this patch the freeing messages now look like this:
Freeing SMP alternatives memory: 32K
Freeing initrd memory: 10588K
Freeing unused kernel memory: 3592K
Freeing unused kernel memory: 1352K
Freeing unused kernel memory: 632K
Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Link: http://lkml.kernel.org/r/6836ff90c45b71d38e5d4405aec56fa9e5d1d4b2.1477405374.git.jpoimboe@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5847,8 +5847,8 @@ unsigned long free_reserved_area(void *s
}
if (pages && s)
- pr_info("Freeing %s memory: %ldK (%p - %p)\n",
- s, pages << (PAGE_SHIFT - 10), start, end);
+ pr_info("Freeing %s memory: %ldK\n",
+ s, pages << (PAGE_SHIFT - 10));
return pages;
}
Patches currently in stable-queue which might be from jpoimboe@xxxxxxxxxx are
queue-4.4/mm-page_alloc-remove-kernel-address-exposure-in-free_reserved_area.patch