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Date: Thu, 04 May 2017 17:23:58 +0300
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From: "Eli Zaretskii (eliz AT gnu DOT org) [via djgpp-workers AT delorie DOT com]" <djgpp-workers AT delorie DOT com>
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Subject: Re: gcc-7.1.0
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> Date: Thu, 04 May 2017 01:01:40 +0200
> From: "Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp-workers AT delorie DOT com]" <djgpp-workers AT delorie DOT com>
> 
> gcc ... -c dosexec.c
> dosexec.c: In function 'direct_exec_tail':
> dosexec.c:409:19: warning: '%04lX' directive writing between 4 and 7 bytes into a region of size 5 [-Wformat-overflow=]
>       sprintf (t2, "%04lX", tbuf_beg>>4);
>                     ^~~~~
> dosexec.c:409:18: note: directive argument in the range [0, 268435455]
>       sprintf (t2, "%04lX", tbuf_beg>>4);
>                    ^~~~~~~
> dosexec.c:409:5: note: 'sprintf' output between 5 and 8 bytes into a destination of size 5
>       sprintf (t2, "%04lX", tbuf_beg>>4);
>       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> dosexec.c: In function 'go32_exec':
> dosexec.c:1109:50: warning: '%04x' directive writing 4 bytes into a region of size between 3 and 13 [-Wformat-overflow=]
>     sprintf(proxy_cmdline, "%s=%04x %04x %04x %04x %04x",
>                                                    ^~~~
> dosexec.c:1109:26: note: directive argument in the range [0, 65535]
>     sprintf(proxy_cmdline, "%s=%04x %04x %04x %04x %04x",
>                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> dosexec.c:1109:3: note: 'sprintf' output 26 or more bytes (assuming 36) into a destination of size 34
>     sprintf(proxy_cmdline, "%s=%04x %04x %04x %04x %04x",
>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>       __PROXY, argc,
>       ~~~~~~~~~~~~~~
>      (unsigned)(tbuf_beg >> 4), rm_off & 0xffff,
>      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>      (unsigned)(tbuf_beg >> 4), si_off & 0xffff);
>      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

It's probably best to tweak the code to make sure the buffer overruns
cannot happen.