From: Ingo Molnar <mingo@elte.hu>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary
Date: Fri, 01 Jul 2011 14:46:41 +0000 [thread overview]
Message-ID: <20110701144641.GA23272@elte.hu> (raw)
In-Reply-To: <20110701144129.GA10052@infradead.org>
* Christoph Hellwig <hch@infradead.org> wrote:
> On Fri, Jul 01, 2011 at 04:37:35PM +0200, Ingo Molnar wrote:
>
> > After initial modules have loaded i essentially disable crash.ko
> > via /proc/sys/kernel/modules_disabled so rootkits have to work a
> > bit harder than that.
>
> Not sure for fedora as I don'[t have a kernel tree at hand right
> now, but for x86 systems at least RHEL6 has the module built in.
> [...]
Fedora Rawhide has it modular:
# grep CRASH /boot/config-2.6.38-0.rc7.git2.3.fc16.x86_64
CONFIG_CRASH=m
# rpm -ql kernel-2.6.38-0.rc7.git2.3.fc16.x86_64 | grep crash
/lib/modules/2.6.38-0.rc7.git2.3.fc16.x86_64/kernel/drivers/char/crash.ko
> [...] Either way we'll need some way to support crash properly in
> mainline, preferably in a boot-time opt-in way. [...]
Yes, boot-time opt-in was what i suggested.
> [...] I'd tend slightly toward optionally enabling /dev/mem for it
> instead of a separate driver, but if people prefer a different
> route I'm fine, too.
No, sharing the driver is perfectly fine and sane as long as this
weird usage is not enabled widely.
> Note that for normal crash usage read only access is just fine.
That's true as well. Petr?
Thanks,
Ingo
next prev parent reply other threads:[~2011-07-01 14:46 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-17 8:38 [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-06-17 8:46 ` [PATCH 06/10] sh: change valid_phys_addr_range's @addr param to phys_addr_t Petr Tesarik
2011-06-17 9:30 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ingo Molnar
2011-06-17 9:41 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of Russell King - ARM Linux
2011-06-17 9:55 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-06-20 2:42 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Américo Wang
2011-06-27 7:46 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of Petr Tesarik
2011-06-19 23:02 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ryan Mallon
2011-06-19 23:44 ` H. Peter Anvin
2011-06-20 7:41 ` Ingo Molnar
2011-06-20 15:59 ` H. Peter Anvin
2011-06-20 16:40 ` Ingo Molnar
2011-06-20 16:44 ` H. Peter Anvin
2011-06-21 6:56 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of Srivatsa Vaddagiri
2011-06-20 0:42 ` Matthew Wilcox
2011-06-20 0:46 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ryan Mallon
2011-06-20 0:52 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of Matthew Wilcox
2011-06-20 1:02 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ryan Mallon
2011-06-20 7:31 ` Ingo Molnar
2011-06-20 8:03 ` Ryan Mallon
2011-06-20 17:10 ` Ray Lee
2011-06-29 9:05 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-07-01 12:58 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ingo Molnar
2011-07-01 13:43 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-07-01 13:47 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Christoph Hellwig
2011-07-01 14:37 ` Ingo Molnar
2011-07-01 14:41 ` Christoph Hellwig
2011-07-01 14:46 ` Ingo Molnar [this message]
2011-07-01 14:54 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-07-01 15:36 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ingo Molnar
2011-07-01 16:00 ` H. Peter Anvin
2011-07-01 16:13 ` Ingo Molnar
2011-07-01 19:34 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-07-01 19:56 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ingo Molnar
2011-07-01 20:44 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-07-03 19:46 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ingo Molnar
2011-07-05 17:49 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of Matthew Garrett
2011-07-05 17:56 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary H. Peter Anvin
2011-07-05 22:34 ` H. Peter Anvin
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