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SubjectRe: [PATCH] a.out don't exec over NFS
On Sun, 07 Mar 1999, Linus Torvalds wrote:
>
> On Mon, 8 Mar 1999, Jan Rekorajski wrote:
> >
> > I got the point, and try to work on a.out checks instead of NFS client.
>
> We might be able to just remove the test for blocksize for the old a.out
> support. The blocksize only matters for filesystems that support the bmap
> operation, so the a.out test is really not strictly correct anyway. A more
> correct thing would probably be to do the blocksize check only if we have
> a bmap function for the file.
>

You mean mmap? The problem is that most mmaps expects offset to be blocksize
aligned. In case of a.out offset is 1024 and if blocksize is != 1024 you
may forget running a.out binaries. We can either change a.out header size to
4096 (or 8192) bytes and order everyone to convert binaries, or do a generic
mmap(NULL 0, ..., 0); read_exec(); and expect strange things to happen.

BTW, I just tried to "convert" a sample a.out binary and chage the code,
it didn't work. The test binary was old doom game and it hanged
after a few seconds. :(

Jan


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