Attachment 407 Details for Bug 1096 – Detailed description of malloc failure

Detailed description of malloc failure

samba1.txt (text/plain), 1.12 KB, created by Heinrich Mislik on 2004-02-18 03:25:39 UTC

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Creator: Heinrich Mislik

Created: 2004-02-18 03:25:39 UTC

Size: 1.12 KB

patch

obsolete

>cc is IBMs "vac.C 5.0.2.6   C for AIX Compiler" on AIX 5.2.
>
>This is from /usr/include/stdlib.h (_ALL_SOURCE is defined):
>
>#if defined(_ALL_SOURCE) && defined(_LINUX_SOURCE_COMPAT)
>#ifdef  _NO_PROTO
>extern void *__linux_malloc();
>extern void *__linux_realloc();
>extern void *__linux_calloc();
>extern void *__linux_valloc();
>#else
>extern void *__linux_malloc(size_t);
>extern void *__linux_realloc(void *, size_t);
>extern void *__linux_calloc(size_t, size_t);
>extern void *__linux_valloc(size_t);
>#endif
>#define malloc __linux_malloc
>#define calloc __linux_calloc
>#define realloc __linux_realloc
>#define valloc __linux_valloc
>#endif  /* _LINUX_SOURCE_COMPAT */
>
>I couldn't find anything about __linux_malloc() but the following
>documents that it is not suitable for 64 Bit:
>
># cat malloc_broken.c
>#include <stdlib.h>
>main()
>{
>    char *p = malloc(10);
>    printf("%p\n",p);
>    p[0] =0;
>}
>
># cc -q32 -D_LINUX_SOURCE_COMPAT malloc_broken.c
># ./a.out
>200004f8
># cc -q64 -D_LINUX_SOURCE_COMPAT malloc_broken.c
># ./a.out
>100005f0
>Segmentation fault (core dumped)
># cc -q64 malloc_broken.c
># ./a.out
>1100005f0
>
>The 64-bit Pointer is truncated to 32 bit!
>

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