From: "H. Peter Anvin" <hpa@zytor.com>
To: Borislav Petkov <bp@alien8.de>, Vivek Goyal <vgoyal@redhat.com>
Cc: mjg59@srcf.ucam.org, bhe@redhat.com, greg@kroah.com,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
ebiederm@xmission.com, jkosina@suse.cz,
akpm@linux-foundation.org, Dave Young <dyoung@redhat.com>,
WANG Chao <chaowang@redhat.com>
Subject: Re: [PATCH 07/13] kexec: Implementation of new syscall kexec_file_load
Date: Mon, 16 Jun 2014 14:25:07 -0700 [thread overview]
Message-ID: <539F60B3.1040509@zytor.com> (raw)
In-Reply-To: <20140616210927.GJ8170@pd.tnic>
On 06/16/2014 02:09 PM, Borislav Petkov wrote:
>
> Nah, I don't feel strongly about it - I just don't trust userspace and
> think that every value we get from it should be "sanitized".
>
Borislav and I talked about this briefly over IRC. A key part of that
is that if userspace could manipulate this system call to consume an
unreasonable amount of memory, we would have a problem, for example if
this code used vzalloc() instead of kzalloc(). However, since
kmalloc/kzalloc implies a relatively restrictive limit on the memory
allocation size anyway, well short of anything that could cause OOM
problems, that pretty much solves the problem.
-hpa
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kexec mailing list
kexec@lists.infradead.org
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Borislav Petkov <bp@alien8.de>, Vivek Goyal <vgoyal@redhat.com>
Cc: WANG Chao <chaowang@redhat.com>, Dave Young <dyoung@redhat.com>,
mjg59@srcf.ucam.org, bhe@redhat.com, jkosina@suse.cz,
greg@kroah.com, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, ebiederm@xmission.com,
akpm@linux-foundation.org
Subject: Re: [PATCH 07/13] kexec: Implementation of new syscall kexec_file_load
Date: Mon, 16 Jun 2014 14:25:07 -0700 [thread overview]
Message-ID: <539F60B3.1040509@zytor.com> (raw)
In-Reply-To: <20140616210927.GJ8170@pd.tnic>
On 06/16/2014 02:09 PM, Borislav Petkov wrote:
>
> Nah, I don't feel strongly about it - I just don't trust userspace and
> think that every value we get from it should be "sanitized".
>
Borislav and I talked about this briefly over IRC. A key part of that
is that if userspace could manipulate this system call to consume an
unreasonable amount of memory, we would have a problem, for example if
this code used vzalloc() instead of kzalloc(). However, since
kmalloc/kzalloc implies a relatively restrictive limit on the memory
allocation size anyway, well short of anything that could cause OOM
problems, that pretty much solves the problem.
-hpa
next prev parent reply other threads:[~2014-06-16 21:26 UTC|newest]
Thread overview: 214+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-03 13:06 [RFC PATCH 00/13][V3] kexec: A new system call to allow in kernel loading Vivek Goyal
2014-06-03 13:06 ` Vivek Goyal
2014-06-03 13:06 ` [PATCH 01/13] bin2c: Move bin2c in scripts/basic Vivek Goyal
2014-06-03 13:06 ` Vivek Goyal
2014-06-03 16:01 ` Borislav Petkov
2014-06-03 16:01 ` Borislav Petkov
2014-06-03 17:13 ` Vivek Goyal
2014-06-03 17:13 ` Vivek Goyal
2014-06-03 13:06 ` [PATCH 02/13] kernel: Build bin2c based on config option CONFIG_BUILD_BIN2C Vivek Goyal
2014-06-03 13:06 ` Vivek Goyal
2014-06-04 9:13 ` Borislav Petkov
2014-06-04 9:13 ` Borislav Petkov
2014-06-03 13:06 ` [PATCH 03/13] kexec: Move segment verification code in a separate function Vivek Goyal
2014-06-03 13:06 ` Vivek Goyal
2014-06-04 9:32 ` Borislav Petkov
2014-06-04 9:32 ` Borislav Petkov
2014-06-04 18:47 ` Vivek Goyal
2014-06-04 18:47 ` Vivek Goyal
2014-06-04 20:30 ` Borislav Petkov
2014-06-04 20:30 ` Borislav Petkov
2014-06-05 14:05 ` Vivek Goyal
2014-06-05 14:05 ` Vivek Goyal
2014-06-05 14:07 ` Borislav Petkov
2014-06-05 14:07 ` Borislav Petkov
2014-06-03 13:06 ` [PATCH 04/13] resource: Provide new functions to walk through resources Vivek Goyal
2014-06-03 13:06 ` Vivek Goyal
2014-06-04 10:24 ` Borislav Petkov
2014-06-04 10:24 ` Borislav Petkov
2014-06-05 13:58 ` Vivek Goyal
2014-06-05 13:58 ` Vivek Goyal
2014-06-03 13:06 ` [PATCH 05/13] kexec: Make kexec_segment user buffer pointer a union Vivek Goyal
2014-06-03 13:06 ` Vivek Goyal
2014-06-04 10:34 ` Borislav Petkov
2014-06-04 10:34 ` Borislav Petkov
2014-06-03 13:06 ` [PATCH 06/13] kexec: New syscall kexec_file_load() declaration Vivek Goyal
2014-06-03 13:06 ` Vivek Goyal
2014-06-04 15:18 ` Borislav Petkov
2014-06-04 15:18 ` Borislav Petkov
2014-06-05 9:56 ` WANG Chao
2014-06-05 9:56 ` WANG Chao
2014-06-05 15:16 ` Vivek Goyal
2014-06-05 15:16 ` Vivek Goyal
2014-06-05 15:22 ` Vivek Goyal
2014-06-05 15:22 ` Vivek Goyal
2014-06-06 6:34 ` WANG Chao
2014-06-06 6:34 ` WANG Chao
2014-06-03 13:06 ` [PATCH 07/13] kexec: Implementation of new syscall kexec_file_load Vivek Goyal
2014-06-03 13:06 ` Vivek Goyal
2014-06-05 11:15 ` Borislav Petkov
2014-06-05 11:15 ` Borislav Petkov
2014-06-05 20:17 ` Vivek Goyal
2014-06-05 20:17 ` Vivek Goyal
2014-06-06 2:11 ` Borislav Petkov
2014-06-06 2:11 ` Borislav Petkov
2014-06-06 18:02 ` Vivek Goyal
2014-06-06 18:02 ` Vivek Goyal
2014-06-11 14:13 ` Borislav Petkov
2014-06-11 14:13 ` Borislav Petkov
2014-06-11 17:04 ` Vivek Goyal
2014-06-11 17:04 ` Vivek Goyal
2014-06-06 6:56 ` WANG Chao
2014-06-06 6:56 ` WANG Chao
2014-06-06 18:19 ` Vivek Goyal
2014-06-06 18:19 ` Vivek Goyal
2014-06-09 2:11 ` Dave Young
2014-06-09 2:11 ` Dave Young
2014-06-09 5:35 ` WANG Chao
2014-06-09 5:35 ` WANG Chao
2014-06-09 15:41 ` Vivek Goyal
2014-06-09 15:41 ` Vivek Goyal
2014-06-13 7:50 ` Borislav Petkov
2014-06-13 7:50 ` Borislav Petkov
2014-06-13 8:00 ` WANG Chao
2014-06-13 8:00 ` WANG Chao
2014-06-13 8:10 ` Borislav Petkov
2014-06-13 8:10 ` Borislav Petkov
2014-06-13 8:24 ` WANG Chao
2014-06-13 8:24 ` WANG Chao
2014-06-13 8:30 ` Borislav Petkov
2014-06-13 8:30 ` Borislav Petkov
2014-06-13 12:49 ` Vivek Goyal
2014-06-13 12:49 ` Vivek Goyal
2014-06-13 12:46 ` Vivek Goyal
2014-06-13 12:46 ` Vivek Goyal
2014-06-13 15:36 ` Borislav Petkov
2014-06-13 15:36 ` Borislav Petkov
2014-06-16 17:38 ` Vivek Goyal
2014-06-16 17:38 ` Vivek Goyal
2014-06-16 20:05 ` Borislav Petkov
2014-06-16 20:05 ` Borislav Petkov
2014-06-16 20:53 ` Vivek Goyal
2014-06-16 20:53 ` Vivek Goyal
2014-06-16 21:09 ` Borislav Petkov
2014-06-16 21:09 ` Borislav Petkov
2014-06-16 21:25 ` H. Peter Anvin [this message]
2014-06-16 21:25 ` H. Peter Anvin
2014-06-16 21:43 ` Vivek Goyal
2014-06-16 21:43 ` Vivek Goyal
2014-06-16 22:10 ` Borislav Petkov
2014-06-16 22:10 ` Borislav Petkov
2014-06-16 22:49 ` H. Peter Anvin
2014-06-16 22:49 ` H. Peter Anvin
2014-06-09 15:30 ` Vivek Goyal
2014-06-09 15:30 ` Vivek Goyal
2014-06-03 13:06 ` [PATCH 08/13] purgatory/sha256: Provide implementation of sha256 in purgaotory context Vivek Goyal
2014-06-03 13:06 ` Vivek Goyal
2014-06-03 13:06 ` [PATCH 09/13] purgatory: Core purgatory functionality Vivek Goyal
2014-06-03 13:06 ` Vivek Goyal
2014-06-05 20:05 ` Borislav Petkov
2014-06-05 20:05 ` Borislav Petkov
2014-06-06 19:51 ` Vivek Goyal
2014-06-06 19:51 ` Vivek Goyal
2014-06-13 10:17 ` Borislav Petkov
2014-06-13 10:17 ` Borislav Petkov
2014-06-16 17:25 ` Vivek Goyal
2014-06-16 17:25 ` Vivek Goyal
2014-06-16 20:10 ` Borislav Petkov
2014-06-16 20:10 ` Borislav Petkov
2014-06-03 13:06 ` [PATCH 10/13] kexec: Load and Relocate purgatory at kernel load time Vivek Goyal
2014-06-03 13:06 ` Vivek Goyal
2014-06-10 16:31 ` Borislav Petkov
2014-06-10 16:31 ` Borislav Petkov
2014-06-11 19:24 ` Vivek Goyal
2014-06-11 19:24 ` Vivek Goyal
2014-06-13 16:14 ` Borislav Petkov
2014-06-13 16:14 ` Borislav Petkov
2014-06-03 13:07 ` [PATCH 11/13] kexec-bzImage: Support for loading bzImage using 64bit entry Vivek Goyal
2014-06-03 13:07 ` Vivek Goyal
2014-06-15 16:35 ` Borislav Petkov
2014-06-15 16:35 ` Borislav Petkov
2014-06-15 16:56 ` H. Peter Anvin
2014-06-15 16:56 ` H. Peter Anvin
2014-06-16 20:06 ` Vivek Goyal
2014-06-16 20:06 ` Vivek Goyal
2014-06-16 20:57 ` Borislav Petkov
2014-06-16 20:57 ` Borislav Petkov
2014-06-16 21:15 ` Vivek Goyal
2014-06-16 21:15 ` Vivek Goyal
2014-06-16 21:27 ` Borislav Petkov
2014-06-16 21:27 ` Borislav Petkov
2014-06-16 21:45 ` Vivek Goyal
2014-06-16 21:45 ` Vivek Goyal
2014-06-24 17:31 ` Vivek Goyal
2014-06-24 17:31 ` Vivek Goyal
2014-06-24 18:23 ` Borislav Petkov
2014-06-24 18:23 ` Borislav Petkov
2014-06-03 13:07 ` [PATCH 12/13] kexec: Support for Kexec on panic using new system call Vivek Goyal
2014-06-03 13:07 ` Vivek Goyal
2014-06-17 21:43 ` Borislav Petkov
2014-06-17 21:43 ` Borislav Petkov
2014-06-18 14:20 ` Vivek Goyal
2014-06-18 14:20 ` Vivek Goyal
2014-06-03 13:07 ` [PATCH 13/13] kexec: Support kexec/kdump on EFI systems Vivek Goyal
2014-06-03 13:07 ` Vivek Goyal
2014-06-18 15:43 ` Borislav Petkov
2014-06-18 15:43 ` Borislav Petkov
2014-06-18 16:06 ` Borislav Petkov
2014-06-18 16:06 ` Borislav Petkov
2014-06-18 16:06 ` Borislav Petkov
2014-06-18 17:39 ` Vivek Goyal
2014-06-18 17:39 ` Vivek Goyal
2014-06-18 17:39 ` Vivek Goyal
2014-06-03 13:12 ` [RFC PATCH 00/13][V3] kexec: A new system call to allow in kernel loading Vivek Goyal
2014-06-03 13:12 ` Vivek Goyal
2014-06-04 9:22 ` WANG Chao
2014-06-04 9:22 ` WANG Chao
2014-06-04 17:50 ` Vivek Goyal
2014-06-04 17:50 ` Vivek Goyal
2014-06-04 19:39 ` Michael Kerrisk
2014-06-04 19:39 ` Michael Kerrisk
2014-06-04 19:39 ` Michael Kerrisk
2014-06-05 14:04 ` Vivek Goyal
2014-06-05 14:04 ` Vivek Goyal
2014-06-05 14:04 ` Vivek Goyal
2014-06-06 5:45 ` Michael Kerrisk (man-pages)
2014-06-06 5:45 ` Michael Kerrisk (man-pages)
2014-06-06 5:45 ` Michael Kerrisk (man-pages)
2014-06-06 18:04 ` Vivek Goyal
2014-06-06 18:04 ` Vivek Goyal
2014-06-06 18:04 ` Vivek Goyal
2014-06-05 8:31 ` Dave Young
2014-06-05 8:31 ` Dave Young
2014-06-05 15:01 ` Vivek Goyal
2014-06-05 15:01 ` Vivek Goyal
2014-06-06 7:37 ` Dave Young
2014-06-06 7:37 ` Dave Young
2014-06-06 20:04 ` Vivek Goyal
2014-06-06 20:04 ` Vivek Goyal
2014-06-09 1:57 ` Dave Young
2014-06-09 1:57 ` Dave Young
2014-06-06 20:37 ` H. Peter Anvin
2014-06-06 20:37 ` H. Peter Anvin
2014-06-06 20:58 ` Matt Fleming
2014-06-06 20:58 ` Matt Fleming
2014-06-06 21:00 ` H. Peter Anvin
2014-06-06 21:00 ` H. Peter Anvin
2014-06-06 21:02 ` Matt Fleming
2014-06-06 21:02 ` Matt Fleming
2014-06-12 5:42 ` Dave Young
2014-06-12 5:42 ` Dave Young
2014-06-12 12:36 ` Vivek Goyal
2014-06-12 12:36 ` Vivek Goyal
2014-06-17 14:24 ` Vivek Goyal
2014-06-17 14:24 ` Vivek Goyal
2014-06-18 1:45 ` Dave Young
2014-06-18 1:45 ` Dave Young
2014-06-18 1:52 ` Dave Young
2014-06-18 1:52 ` Dave Young
2014-06-18 12:40 ` Vivek Goyal
2014-06-18 12:40 ` Vivek Goyal
2014-06-16 21:13 ` Borislav Petkov
2014-06-16 21:13 ` Borislav Petkov
2014-06-17 13:24 ` Vivek Goyal
2014-06-17 13:24 ` Vivek Goyal
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