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Hello dear Cygwin developpers ! This is my first post here, so I would like to begin by sending you a big thank for Cygwin ! This is a great tool to port programs to Windows. I think I found a bug in mprotect() implementation. This call is unable to set some protections (PROT_READ|PROT_WRITE for example) on a given memory area, while it can set some others (PROT_NONE or PROT_READ for example) on the same memory area. From my tests, it seems to happen only on WNT5+ (ie. Windows 2000 and Windows XP - detailed results below). I upgraded my whole Cygwin setup to confirm the problem is still alive. I also searched the web, FAQ, and ML archive without success before posting here. I wrote a simple testcase to allow you to reproduce the bug. You'll find the source code as an attachement to this mail (to compile with "gcc -o testcase.exe testcase.c" and to run with "./testcase.exe"). This testcase allocate a block of memory with mmap(), fill it with memset(), plays with its protection with mprotect() and fill it again with memset(). I ran this test on various Windows flavour available around. Here are the results : Windows OS Lang Result ------------------------- ------ ---------------------------------------- W98 French OK WNT4 SP6 (Workstation) French OK WNT4 SP6 (Server) French OK W2K SP4 (Professional) French mprotect() (3) failed : Invalid argument W2K SP4 (Advanced server) French mprotect() (3) failed : Invalid argument WXP SP1 (Professional) French mprotect() (3) failed : Invalid argument Of course I'm ready to dig more if needed. But I really need some help since I'm not familiar with Cygwin source code, nor with Windows developpement. For the curious, I discovered this bug while trying to support ARAnyM's m68k JIT compiler on Cygwin. ARAnyM (http://aranym.atari.org) is a free (GPLed) virtual Atari-compatible system. Best Regards, and thanks in advance for any help, Xavier
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testcase.c
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