native_client_sdk/doc_generated/reference/sandbox_internals/arm-32-bit-sandbox.html - Issue 2875303003: Add migration to WebAssembly information to PNaCl / NaCl docs.

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Issue 2875303003: Add migration to WebAssembly information to PNaCl / NaCl docs. (Closed)

Patch Set: fix Created 3 years, 6 months ago

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1 {{+bindTo:partials.standard_nacl_article}}	1 {{+bindTo:partials.standard_nacl_article}}

2	2

3 <section id="arm-32-bit-sandbox">	3 <b><font color="#cc0000">

4 <span id="id1"></span><h1 id="arm-32-bit-sandbox"><span id="id1"></span>ARM 32-b it Sandbox</h1>	4 NOTE:

	5 Deprecation of the technologies described here has been announced

	6 for platforms other than ChromeOS.<br/>

	7 Please visit our

	8 <a href="/native-client/migration">migration guide</a>

	9 for details.

	10 </font></b>

	11 <hr/><section id="id1">

	12 <h1 id="id1">ARM 32-bit Sandbox</h1>

5 <p>Native Client for ARM is a sandboxing technology for running	13 <p>Native Client for ARM is a sandboxing technology for running

6 programs—even malicious ones—safely, on computers that use 32-bit	14 programs—even malicious ones—safely, on computers that use 32-bit

7 ARM processors. The ARM sandbox is an extension of earlier work on	15 ARM processors. The ARM sandbox is an extension of earlier work on

8 Native Client for x86 processors. Security is provided with a low	16 Native Client for x86 processors. Security is provided with a low

9 performance overhead of about 10% over regular ARM code, and as you’ll	17 performance overhead of about 10% over regular ARM code, and as you’ll

10 see in this document the sandbox model is beautifully simple, meaning	18 see in this document the sandbox model is beautifully simple, meaning

11 that the trusted codebase is much easier to validate.</p>	19 that the trusted codebase is much easier to validate.</p>

12 <p>As an implementation detail, the Native Client 32-bit ARM sandbox is	20 <p>As an implementation detail, the Native Client 32-bit ARM sandbox is

13 currently used by Portable Native Client to execute code on 32-bit ARM	21 currently used by Portable Native Client to execute code on 32-bit ARM

14 machines in a safe manner. The portable bitcode contained in a <strong>pexe</str ong>	22 machines in a safe manner. The portable bitcode contained in a <strong>pexe</str ong>

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778 <h4 id="validator-code">Validator Code</h4>	786 <h4 id="validator-code">Validator Code</h4>

779 <p>By now you’re itching to see the sandbox validator’s code and dis sect	787 <p>By now you’re itching to see the sandbox validator’s code and dis sect

780 it. You’ll have a disapointing read: at less that 500 lines of code	788 it. You’ll have a disapointing read: at less that 500 lines of code

781 <a class="reference external" href="http://src.chromium.org/viewvc/native_client /trunk/src/native_client/src/trusted/validator_arm/validator.cc">validator.cc</a >	789 <a class="reference external" href="http://src.chromium.org/viewvc/native_client /trunk/src/native_client/src/trusted/validator_arm/validator.cc">validator.cc</a >

782 is quite simple to understand and much shorter than this document. It’s	790 is quite simple to understand and much shorter than this document. It’s

783 of course dependent on the <a class="reference external" href="http://src.chromi um.org/viewvc/native_client/trunk/src/native_client/src/trusted/validator_arm/ar mv7.table">ARMv7 instruction table definition</a>,	791 of course dependent on the <a class="reference external" href="http://src.chromi um.org/viewvc/native_client/trunk/src/native_client/src/trusted/validator_arm/ar mv7.table">ARMv7 instruction table definition</a>,

784 which teaches it about the ARMv7 instruction set.</p>	792 which teaches it about the ARMv7 instruction set.</p>

785 </section>	793 </section>

786	794

787 {{/partials.standard_nacl_article}}	795 {{/partials.standard_nacl_article}}

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