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https://issues.apache.org/jira/browse/STDCXX-989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12612744#action_12612744
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sebor edited comment on STDCXX-989 at 7/10/08 8:34 PM:
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Yowza! Looks like we're a few bytes off. On Solaris/SPARC, {{sizeof(jmp_buf)}}
is {{12 * sizeof(long)}} bytes, or 48 bytes in ILP32 and 96 in LP64. On Linux,
it looks like it's 156 bytes in ILP32 and 200 in LP64. I don't know where the 8
came from...
We should probably have a config test for it. Then again, we need the size (and
the correct alignment) for just a single compiler, and one that's only used for
conformance testing at that. So maybe hardcoding it and adding a regression
test is enough.
was (Author: sebor):
Yowza! Looks like we're a few bytes off. On Solaris/SPARC,
{{sizeof(jmp_buf)}} is {{12 * sizeof(long)}} bytes, or 48 bytes in ILP32 and 96
in LP64. On Linux, it looks like it's 156 bytes in ILP32 and 200 in LP64. I
don't know where the 8 came from...
We should probably have a config test for it. Then again, we need the size for
just a single compiler, and one that's only used for conformance testing at
that. So maybe hardcoding it and adding a regression test is enough.
> [EDG C++ 3.9] definition of jmp_buf causes buffer overflow
> ----------------------------------------------------------
>
> Key: STDCXX-989
> URL: https://issues.apache.org/jira/browse/STDCXX-989
> Project: C++ Standard Library
> Issue Type: Bug
> Components: 18. Language Support
> Affects Versions: 4.2.x
> Environment: Linux/EDG C++ 3.9
> Reporter: Travis Vitek
> Fix For: 4.2.x
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> The {{jmp_buf}} definition provided in {{include/ansi/\_csetjmp.h}} is not as
> large as {{setjmp()}} is expecting. This causes a buffer overflow when
> running tests that use the test driver ({{rw_test}}), which results in data
> corruption. If you run the tests with {{--trace}}, you will see that the
> _clause_ field of the output is always corrupt after the first use.
> The following shows the expected size for us...
> {noformat}
> $ cat u.cpp; eccp u.cpp && ./a.out
> #include <setjmp.h>
> #include <stdio.h>
> int main ()
> {
> printf ("%u\n", sizeof (jmp_buf));
> return 0;
> }
> 156
> {noformat}
> The definition of {{jmp_buf}} in {{include/rw/_csetjmp.h}} is a buffer of 8
> bytes.
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