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Re: [Qemu-devel] elf interpreter prefix scanning can get stuck in a loop
From: |
Karl Magdsick |
Subject: |
Re: [Qemu-devel] elf interpreter prefix scanning can get stuck in a loop |
Date: |
Mon, 20 Dec 2004 00:23:07 -0500 |
Under Linux (or maybe it's inside bash), there is a hard-coded limit
to the maximum number of symlinks to be followed in any path. I've
hit this limit before, but I'm not sure what it is. A maximum symlink
count sounds like a quick-and dirty way to prevent infinite recursion.
The limit I hit seemed too restrictive, but something around 256
symlink traversals seems reasonable. Once you've followed 256
symlinks, it's a fair bet that something is wrong. The limit I hit
seemed to be in the neighborhood of 10.
-Karl
On Sat, 18 Dec 2004 23:09:03 +0100, Lennert Buytenhek
<address@hidden> wrote:
> Hi,
>
> init_paths() seems to be able to get stuck in an 'infinite' loop. For
> example when encountering a '.' symlink:
>
> open("/data/fc2/arm/root/usr/include/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/beecrypt/asm-generic",
> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 27
>
> I'd suggest to always skip symlinks but that doesn't seem like the right
> thing to do..
>
> --L
>
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