Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1278676

Re: [PATCH 15/37] x86, pkeys: pass VMA down in to fault signal generation code

Show all headers | View raw

On Mon, 16 Nov 2015, Dave Hansen wrote:
> During a page fault, we look up the VMA to ensure that the fault
> is in a region with a valid mapping.  But, in the top-level page
> fault code we don't need the VMA for much else.  Once we have
> decided that an access is bad, we are going to send a signal no
> matter what and do not need the VMA any more.  So we do not pass
> it down in to the signal generation code.
> 
> But, for protection keys, we need the VMA.  It tells us *which*
> protection key we violated if we get a PF_PK.  So, we need to
> pass the VMA down and fill in siginfo->si_pkey.
> 
> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

[PATCH 15/37] x86, pkeys: pass VMA down in to fault signal generation code Dave Hansen <dave@sr71.net> - 2015-11-17 04:40 +0100
  Re: [PATCH 15/37] x86, pkeys: pass VMA down in to fault signal  generation code Thomas Gleixner <tglx@linutronix.de> - 2015-11-27 10:40 +0100

csiph-web