Re: chmod 111

[Phillip Susi]

Linus Torvalds wrote:
> In particular, it's fairly easy to create a shared library that replaces a 
> system library (LD_LIBRARY_PATH) and then just dumps out the binary image.

What prevents you from injecting a shared library and manipulating a 
suid executable?  Does the environment get cleared when you exec a suid 
program?  Or does the dynamic linker just notice euid != uid and ignore 
the LD environment variables?  If so then would adding the sgid bit and 
making the binary owned by a powerless group effectively prevent this 
attack vector to read it?


-
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/