Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()

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To: Jamie Lokier <jamie@xxxxxxxxxxxxx>
Subject: Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()
From: Andi Kleen <andi@xxxxxxxxxxxxxx>
Date: Mon, 18 May 2009 12:16:14 +0200
Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, Vitaly Mayatskikh <v.mayatskih@xxxxxxxxx>, Josef Bacik <josef@xxxxxxxxxx>, sandeen@xxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20090518094808.GA12041@xxxxxxxxxxxxx>
User-agent: Mutt/1.4.2.1i

> Is EFAULT really optional on systems with page protection?

It's de facto -- e.g. the x86-64 vsyscalls (getimeofday, time, clock_gettime,
getcpu) never implement it.

-Andi
-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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References:
- [PATCH 0/2] sys_write() should write all valid data
  - From: Vitaly Mayatskikh
- [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()
  - From: Vitaly Mayatskikh
- Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()
  - From: Andi Kleen
- Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()
  - From: Vitaly Mayatskikh
- Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()
  - From: Andi Kleen
- Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()
  - From: Jamie Lokier
- Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()
  - From: Alan Cox
- Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() by check_readable_bytes()
  - From: Jamie Lokier

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