From: Linus Torvalds <torvalds@linux-foundation.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>, Borislav Petkov <bp@alien8.de>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>,
Denys Vlasenko <dvlasenk@redhat.com>
Subject: Re: [GIT PULL] x86/mm changes for v4.4
Date: Wed, 4 Nov 2015 11:26:12 -0800 [thread overview]
Message-ID: <CA+55aFzcwO+RSLeHOwAYvjZ5AcVvD9Th2=G3R=ZQY1xf+MkDow@mail.gmail.com> (raw)
In-Reply-To: <20151103111649.GA3477@gmail.com>
On Tue, Nov 3, 2015 at 3:16 AM, Ingo Molnar <mingo@kernel.org> wrote:
>
> The new CONFIG_DEBUG_WX=y warning is marked default-y if CONFIG_DEBUG_RODATA=y is
> already eanbled, as a special exception, as these bugs are hard to notice and this
> check already found several live bugs.
So this seems to be not very useful.
...
Freeing unused kernel memory: 1068K (ffffffff8bcc0000 -
ffffffff8bdcb000)
Write protecting the kernel read-only data: 12288k
Freeing unused kernel memory: 1944K (ffff88000b61a000 - ffff88000b800000)
Freeing unused kernel memory: 1372K (ffff88000baa9000 - ffff88000bc00000)
------------[ cut here ]------------
WARNING: CPU: 7 PID: 1 at arch/x86/mm/dump_pagetables.c:225
note_page+0x5dc/0x780()
x86/mm: Found insecure W+X mapping at address
ffff88000005f000/0xffff88000005f000
...
x86/mm: Checked W+X mappings: FAILED, 165660 W+X pages found.
...
because it doesn't seem to give you any idea where to look for the
issue. Those 165660 pages come out to 647MB. Odd number.
Is this *supposed* to come out clean?
Linus
next prev parent reply other threads:[~2015-11-04 19:26 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-03 11:16 [GIT PULL] x86/mm changes for v4.4 Ingo Molnar
2015-11-04 19:26 ` Linus Torvalds [this message]
2015-11-04 23:39 ` Dave Jones
2015-11-05 1:31 ` Linus Torvalds
2015-11-05 2:17 ` Dave Jones
2015-11-05 21:27 ` Linus Torvalds
2015-11-05 21:33 ` Linus Torvalds
2015-11-06 11:39 ` Matt Fleming
2015-11-07 7:05 ` Ingo Molnar
2015-11-07 7:05 ` Ingo Molnar
2015-11-07 10:03 ` Matt Fleming
2015-11-07 10:03 ` Matt Fleming
2015-11-05 22:04 ` Linus Torvalds
2015-11-05 22:27 ` Borislav Petkov
2015-11-06 6:55 ` Ingo Molnar
2015-11-06 7:05 ` Andy Lutomirski
2015-11-06 13:09 ` Matt Fleming
2015-11-06 13:09 ` Matt Fleming
2015-11-06 13:24 ` Borislav Petkov
2015-11-06 13:24 ` Borislav Petkov
2015-11-07 7:03 ` Ingo Molnar
2015-11-06 7:44 ` Ingo Molnar
2015-11-06 12:39 ` Matt Fleming
2015-11-07 7:09 ` Ingo Molnar
2015-11-07 7:09 ` Ingo Molnar
2015-11-07 7:39 ` Ard Biesheuvel
2015-11-08 6:58 ` Kees Cook
2015-11-08 7:55 ` Ard Biesheuvel
2015-11-08 7:55 ` Ard Biesheuvel
2015-11-09 21:08 ` Kees Cook
2015-11-10 7:08 ` Ard Biesheuvel
2015-11-10 20:11 ` Kees Cook
2015-11-10 20:11 ` Kees Cook
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