Date: Wed, 18 Nov 2009 14:33:46 -0500 From: Jung-uk Kim <jkim@FreeBSD.org> To: freebsd-hackers@freebsd.org Cc: Robert Watson <rwatson@freebsd.org>, Manprit Singh <manprits@in.niksun.com>, Sharad Chandra <sharadc@in.niksun.com> Subject: Re: mprotect(2) clears the flag for whole page which causes program crash. Message-ID: <200911181433.52557.jkim@FreeBSD.org> In-Reply-To: <alpine.BSF.2.00.0911181849460.12162@fledge.watson.org> References: <200911171529.20098.sharadc@in.niksun.com> <alpine.BSF.2.00.0911181849460.12162@fledge.watson.org>
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On Wednesday 18 November 2009 01:52 pm, Robert Watson wrote: > On Tue, 17 Nov 2009, Sharad Chandra wrote: > > Is it known bug or is there any workaround? How will a userland > > process make sure that process will not crash as malloc(3) can > > allocate where ever it get the memory free to use. > > mprotect(2) operates on pages, so you'll want to use mmap(2) and > munmap(2) to allocate and free pages directly rather than > mallac(3), which manages byte ranges from pages managed using those > same interfaces. For example: http://docs.freebsd.org/cgi/mid.cgi?200911181926.nAIJQHOR081471 Jung-uk Kim
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