From: Oleg Nesterov <oleg@redhat.com>
To: David Howells <dhowells@redhat.com>
Cc: Roland McGrath <roland@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Frysinger <vapier@gentoo.org>,
linux-sh@vger.kernel.org, Paul Mundt <lethal@linux-sh.org>,
uclinux-dist-devel@blackfin.uclinux.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH -mm 1/1] ptrace: PTRACE_GETFDPIC: fix the unsafe usage of child->mm
Date: Tue, 25 May 2010 14:30:27 +0200 [thread overview]
Message-ID: <20100525123027.GA29883@redhat.com> (raw)
In-Reply-To: <20147.1274790240@redhat.com>
On 05/25, David Howells wrote:
>
> Oleg Nesterov <oleg@redhat.com> wrote:
>
> > > Like PEEKTEXT and POKETEXT?
> >
> > They use access_process_vm().
>
> Which needs to get the mm:
>
> int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)
> {
> struct vm_area_struct *vma;
> struct mm_struct *mm;
>
> if (addr + len < addr)
> return 0;
>
> mm = get_task_mm(tsk);
Yes sure,
But I do not think it makes any sense to change the signature of
access_process_vm() as well, it has a lot of callers. And it is
complex, it does get_user_pages(). Compared to that get_task_mm()
inside of access_process_vm() is nothing.
Oleg.
prev parent reply other threads:[~2010-05-25 12:31 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-16 0:30 [PATCH] ptrace: unify FDPIC implementations Mike Frysinger
2010-02-16 1:10 ` Paul Mundt
2010-02-16 8:12 ` Mike Frysinger
2010-05-21 8:42 ` [PATCH v2] " Mike Frysinger
2010-05-21 16:26 ` Oleg Nesterov
2010-05-21 18:35 ` Roland McGrath
2010-05-22 16:53 ` [PATCH -mm 0/1] (Was: ptrace: unify FDPIC implementations) Oleg Nesterov
2010-05-22 16:54 ` [PATCH -mm 1/1] ptrace: PTRACE_GETFDPIC: fix the unsafe usage of child->mm Oleg Nesterov
2010-05-24 4:33 ` [Uclinux-dist-devel] " Mike Frysinger
2010-05-24 8:38 ` Roland McGrath
2010-05-24 14:36 ` David Howells
2010-05-24 15:14 ` Oleg Nesterov
2010-05-24 23:42 ` Roland McGrath
2010-05-25 1:29 ` [Uclinux-dist-devel] " Mike Frysinger
2010-05-25 19:11 ` Roland McGrath
2010-05-25 9:14 ` David Howells
2010-05-25 10:23 ` Oleg Nesterov
2010-05-25 17:28 ` Mike Frysinger
2010-05-26 12:40 ` Oleg Nesterov
2010-05-27 19:55 ` [PATCH 0/2] blackfin: ptrace mm/sram_list fixes Oleg Nesterov
2010-05-27 19:56 ` [PATCH 1/2] blackfin: ptrace: fix the unsafe usage of mm/find_vma in is_user_addr_valid() Oleg Nesterov
2010-05-27 19:56 ` [PATCH 2/2] blackfin: use ->mmap_sem to protect mm_context_t->sram_list Oleg Nesterov
2010-05-27 20:21 ` [PATCH 0/2] blackfin: ptrace mm/sram_list fixes Mike Frysinger
2010-05-28 19:43 ` Oleg Nesterov
2010-05-25 12:24 ` [PATCH -mm 1/1] ptrace: PTRACE_GETFDPIC: fix the unsafe usage of child->mm David Howells
2010-05-25 12:30 ` Oleg Nesterov [this message]
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