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Re: vm_protect vs mprotect

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Re: vm_protect vs mprotect

Subject: Re: vm_protect vs mprotect
From: Chris Ridd <email@hidden>
Date: Thu, 26 Mar 2009 13:55:40 +0000


On 26 Mar 2009, at 11:33, Rohitash Panda wrote:

Hi, I am seeing an issue because of vm_protect being called from signal handlers, where another system call was already in progress.It works fine using mprotect.

The mach call vm_protect() calls vm_map_protect() directly , whearas bsd syscall mprotect calls mach_vm_protect() which eventually calls vm_map_protect().

I guess vm_protect is avoiding some extra checks as compared to mprotect().

Which the preferred interface ? Has anyone heard of any issues with vm_protect ?

The sigaction(2) man page has lists of functions that are considered safe for use in a signal handler. I don't see either vm_protect() or mprotect() in those lists :-(

Cheers,

Chris


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  >vm_protect vs mprotect (From: Rohitash Panda <email@hidden>)




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