Commit 12f60018 authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Greg Kroah-Hartman

mm/page_alloc: Remove kernel address exposure in free_reserved_area()

commit adb1fe9a 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: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/6836ff90c45b71d38e5d4405aec56fa9e5d1d4b2.1477405374.git.jpoimboe@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
Cc: Kees Cook <keescook@google.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bbccdb1e
...@@ -5847,8 +5847,8 @@ unsigned long free_reserved_area(void *start, void *end, int poison, char *s) ...@@ -5847,8 +5847,8 @@ unsigned long free_reserved_area(void *start, void *end, int poison, char *s)
} }
if (pages && s) if (pages && s)
pr_info("Freeing %s memory: %ldK (%p - %p)\n", pr_info("Freeing %s memory: %ldK\n",
s, pages << (PAGE_SHIFT - 10), start, end); s, pages << (PAGE_SHIFT - 10));
return pages; return pages;
} }
......
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