stdcxx-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Commented: (STDCXX-989) [EDG C++ 3.9] definition of jmp_buf causes buffer overflow
Date Fri, 11 Jul 2008 03:27:31 GMT

    [ https://issues.apache.org/jira/browse/STDCXX-989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12612744#action_12612744
] 

Martin Sebor commented on STDCXX-989:
-------------------------------------

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.

> [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.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message