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php4-beta | 199912

Re: [PHP4BETA] ABR: Array bounds read in ZTS mode + explanation. From: Zeev Suraski (zeev <email protected>)
Date: 12/27/99

On Mon, 27 Dec 1999, Thies C. Arntzen wrote:

> **** Purify instrumented bin/nsd (pid 22145) ****
> ABR: Array bounds read (9440 times):
> * This is occurring while in thread 10:
> memcpy [rtlib.o]
> zend_hash_copy [zend_hash.c:861]
> compiler_globals_ctor [zend.c:247]
> allocate_new_resource [TSRM.c:200]
> ts_resource [TSRM.c:235]
> php_ns_request_handler [aolserver.c:500]
> * Reading 60 bytes from 0x264ec8 in the heap (44 bytes at 0x264ed8 illegal).
> * Address 0x264ec8 is at the beginning of a malloc'd block of 16 bytes.
> * This block was allocated from:
> malloc [rtlib.o]
> zend_hash_add_or_update [zend_hash.c:189]
> zend_register_functions [zend_API.c:698]
> zend_startup_builtin_functions [zend_builtin_functions.c:78]
> zend_startup [zend.c:363]
>
> problem is :
>
> zend_API.c line 698
> if (zend_hash_add(target_function_table, ptr->fname, strlen(ptr->fname)+1, &internal_function, sizeof(zend_internal_function), NULL) == FAILURE) {
> unload=1;
> break;
> }
>
> zend.c line 238:
> zend_hash_copy(compiler_globals->function_table, global_function_table, NULL, &tmp_func, sizeof(zend_function));
>
>
> but: sizeof(zend_function) > sizeof(zend_internal_function) so we're
> coying uninted memory (as purify tells us) in compiler_globals_ctor().

Well, that's one of the places that purify reports, correctly from its
point of view, but that we really don't care about.

Zeev 

-- 
Zeev Suraski <zeev <email protected>>
http://www.zend.com/

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