Re: [Patch 3/3] elf: use a macro instead of a raw number

[Roland McGrath]

> But in the kernel code, pr_fname is copied from ->comm, they should
> be equal, shouldn't they?

The point is that we are not at liberty to change the size of pr_fname.
Its size and layout are known to userland and thus set in stone.  To
have a larger size, we would have to invent a new NT_* type code with a
new layout that would also be known to userland.  It's not worth the
bother.  

Nowadays a debugger can see AT_EXECFN in auxv (NT_AUXV in core files,
/proc/pid/auxv live), and look at that address in the user memory (core
file or process).  That's clobberable on the user-mode stack, but it can
be of unbounded size.


Thanks,
Roland
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/