[cmd] Allow for filtering about maps permissions in vmmap

[ValekoZ]

This CL allows for searching sections by their permissions. For instance, you could search for all rwx sections by typing vmmap rwx.

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[Grazfather]

could be useful. We might want to add this as a flag argument though, e.g. vmmap --perms rwx.

Maybe we could even support a 'don't care' e.g. r?? vs r--, the former allowing rw-, r-x, etc. Maybe a good idea for a followup.

[ValekoZ]

I think if we put this behind a flag, we should do it for the other filters too?
Like --addr for searching addresses and --name for searching with the name?
I think the goal here is to make it easily useable, without too much friction (I guess that's why there is no --addr/--name?) so in order to stay consistent I think its better to keep it this way

But I think the idea of ? is great I'll do that :)

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[ValekoZ]

I'm marking this as draft until #1120 is merged

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[hugsy]

I love this filter!
Just some minor changes (mostly docs & tests)

[hugsy]

Could be worth adding unit test for this function alone.

[hugsy]

Some examples of --perms would be nice too

[hugsy]

You can go further in checking the output, this doesn't really check the output is as intended. Also those tests being equivalent, you can thoroughly check the strings in the 1st assert, then check that the 1st result equals the 2nd.

Suggested change

	res = gdb.execute("vmmap -p r?-", to_string=True)
	self.assertGreater(len(res.splitlines()), 5)
	res = gdb.execute("vmmap --perms r?-", to_string=True)
	self.assertGreater(len(res.splitlines()), 5)
	res1 = gdb.execute("vmmap -p r?-", to_string=True)
	lines1 = res.splitlines()
	self.assertGreater(len(lines), 5)
	for line in lines1:
	perm_str = line.split()[3]
	assert perm_str[0] == 'r'
	assert perm_str[1] in ('w', '-')
	assert perm_str[2] == '-'
	res2 = gdb.execute("vmmap --perms r?-", to_string=True)
	assert res1 == res2

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