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<h3>
Ben Gamari pushed to branch wip/T16779
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/47b6011e65e63c65743b8500eca8321034d91fc2">47b6011e</a></strong>
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<span>by Ben Gamari</span>
<i>at 2019-06-08T18:19:21Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Only mprotect GOT after it is filled
This fixes a regression, introduced by 67c422ca, where we mprotect'd the
global offset table (GOT) region to PROT_READ before we had finished
filling it, resulting in a linker crash.
Fixes #16779.
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<h4>1 changed file:</h4>
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<li class="file-stats">
<a href="#1fbdc15fb59db29e00c07dc7dac3b36492baaa1c">
rts/linker/elf_got.c
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<h4>Changes:</h4>
<li id="1fbdc15fb59db29e00c07dc7dac3b36492baaa1c">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/47b6011e65e63c65743b8500eca8321034d91fc2#1fbdc15fb59db29e00c07dc7dac3b36492baaa1c"><strong>rts/linker/elf_got.c</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -64,8 +64,6 @@ makeGot(ObjectCode * oc) {</td>
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64
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="c"> <span class="n" style="color: #333;">symTab</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">symbols</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">].</span><span class="n" style="color: #333;">got_addr</span></span>
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65
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65
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="c"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">oc</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">got_start</span></span>
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66
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="c"> <span class="o" style="font-weight: 600;">+</span> <span class="p">(</span><span class="n" style="color: #333;">slot</span><span class="o" style="font-weight: 600;">++</span> <span class="o" style="font-weight: 600;">*</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="o" style="font-weight: 600;">*</span><span class="p">));</span></span>
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67
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<pre style="margin: 0;">-<span id="LC67" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span><span class="p">(</span><span class="n" style="color: #333;">mprotect</span><span class="p">(</span><span class="n" style="color: #333;">mem</span><span class="p">,</span> <span class="n" style="color: #333;">oc</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">got_size</span><span class="p">,</span> <span class="n" style="color: #333;">PROT_READ</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!=</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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68
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="c"> <span class="n" style="color: #333;">sysErrorBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"unable to protect memory"</span><span class="p">);</span></span>
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67
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">EXIT_SUCCESS</span><span class="p">;</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -115,6 +113,11 @@ fillGot(ObjectCode * oc) {</td>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// We are done initializing the GOT; freeze it.</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span><span class="p">(</span><span class="n" style="color: #333;">mprotect</span><span class="p">(</span><span class="n" style="color: #333;">of</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">got_start</span><span class="p">,</span> <span class="n" style="color: #333;">oc</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">got_size</span><span class="p">,</span> <span class="n" style="color: #333;">PROT_READ</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!=</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="c"> <span class="n" style="color: #333;">sysErrorBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"unable to protect memory"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">EXIT_SUCCESS</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="c"></span>
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