Re: [PATCH] mmap: add sysctl for controlling ~VM_MAYEXEC taint

[Roland McGrath <mcgrathr@google.com>]

On Tue, Aug 16, 2011 at 2:33 AM, Mel Gorman <mel@csn.ul.ie> wrote:
> Is using shm_open()+mmap instead of open()+mmap() to open a file on
> /dev/shm really that difficult?
>
> int shm_open(const char *name, int oflag, mode_t mode);
> int open(const char *pathname, int flags, mode_t mode);

I cannot figure out the rationale behind this question at all.
Both of these library functions result in the same system call.

> An ordinary user is not going to know that a segfault from an
> application can be fixed with this sysctl. This looks like something
> that should be fixed in the library so that it can work on kernels
> that do not have the sysctl.

I think the expectation is that the administrator or system builder
who decides to set the (non-default) noexec mount option will also
set the sysctl at the same time.


Thanks,
Roland

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