From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: "Sumit Semwal" <sumit.semwal@linaro.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
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Subject: Re: [PATCH v5 2/2] mm: add a field to store names for private anonymous memory
Date: Fri, 21 Aug 2020 00:59:03 +0300 [thread overview]
Message-ID: <20200820215903.GU2074@grain> (raw)
In-Reply-To: <b96b61a1-eb8e-8141-d773-bb828402ab8d@intel.com>
On Thu, Aug 20, 2020 at 02:45:38PM -0700, Dave Hansen wrote:
> >
> > Guys, could you please enlighen me, I don't understand -- we pass some
> > random user-space pointer and save it in vm_area_struct then in procfs
> > we treat it as "string" and print out? What prevents me to put some crap
> > here then unmap this pointer the kernel will cause page fault in procfs
> > output (in best scenario)?
>
> Remember, this is virtually identical to what we do for
> /proc/$pid/cmdline in get_mm_cmdline(). The kernel goes following a
> user-provided pointer into the user address space looking for a string.
>
> If userspace points it to garbage, access_remote_vm() will fail safely.
Yeah, managed to miss it, thanks!
prev parent reply other threads:[~2020-08-20 21:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-19 14:16 [PATCH v5 0/2] Anonymous VMA naming patches Sumit Semwal
2020-08-19 14:16 ` [PATCH v5 1/2] mm: rearrange madvise code to allow for reuse Sumit Semwal
2020-08-19 14:16 ` [PATCH v5 2/2] mm: add a field to store names for private anonymous memory Sumit Semwal
2020-08-19 14:37 ` Michal Hocko
2020-08-19 15:02 ` Matthew Wilcox
2020-08-19 17:48 ` Sumit Semwal
2020-08-20 15:46 ` Oleg Nesterov
2020-08-19 17:14 ` kernel test robot
2020-08-19 17:14 ` kernel test robot
2020-08-19 17:42 ` kernel test robot
2020-08-19 17:42 ` kernel test robot
2020-08-20 7:58 ` Michal Hocko
2020-08-20 23:28 ` Colin Cross
2020-08-21 3:21 ` Sumit Semwal
2020-08-21 7:24 ` Michal Hocko
2020-08-21 7:53 ` Michal Hocko
2020-08-21 8:02 ` Sumit Semwal
2020-08-20 16:00 ` Oleg Nesterov
2020-08-20 21:15 ` Kees Cook
2020-08-21 3:15 ` Sumit Semwal
2020-08-21 3:14 ` Sumit Semwal
2020-08-20 21:40 ` Cyrill Gorcunov
2020-08-20 21:45 ` Colin Cross
2020-08-20 22:15 ` Cyrill Gorcunov
2020-08-20 23:51 ` Colin Cross
2020-08-21 7:05 ` Cyrill Gorcunov
2020-08-20 21:45 ` Dave Hansen
2020-08-20 21:59 ` Cyrill Gorcunov [this message]
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