Date: Wed, 15 Sep 2010 11:27:47 +0200 From: pageexec@...email.hu To: Roland McGrath <roland@...hat.com> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Brad Spengler <spender@...ecurity.net>, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, oss-security@...ts.openwall.com, Solar Designer <solar@...nwall.com>, Kees Cook <kees.cook@...onical.com>, Al Viro <viro@...iv.linux.org.uk>, Oleg Nesterov <oleg@...hat.com>, Neil Horman <nhorman@...driver.com>, linux-fsdevel@...r.kernel.org, Eugene Teo <eugene@...hat.com> Subject: Re: [PATCH 1/3] setup_arg_pages: diagnose excessive argument size On 14 Sep 2010 at 16:04, Roland McGrath wrote: > > userland could never rely on the kernel's policy at all since get_arg_page > > could have failed for more reasons than overstepping the currently hardcoded > > ARG_MAX check in there. > > I don't see how it could fail except for OOM cases where get_user_pages() > failed rather than blocking. Is that what you mean? yes but it's not only OOM (ENOMEM from some allocation), but it can be also EPERM from LSM (if mmap_min_addr is set too high) or EFAULT from get_user_pages (e.g., if VM_FAULT_HWPOISON was returned for a requested page).
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