Commits
Pavel Emelyanov authored and Den Lunev committed 3e0365bbdb8
mainstream: avoid potential kernel stack overflow in binfmt_misc.c This can be triggered with root help only, but... this is critical for us, since now VE root may setup any rule. Register the ":text:E::txt::/root/cat.txt:' rule in binfmt_misc (by root) and try launching the cat.txt file (by anyone) :) The result is - the endless recursion in the load_misc_binary -> open_exec -> load_misc_binary chain and stack overflow. There's a similar problem with binfmt_script, and there's a sh_bang memner on linux_binprm structure to handle this, but simply raising this in binfmt_misc may break some setups when the interpreter of some misc binaries is a script. So the proposal is to turn sh_bang into a bit, add a new one (the misc_bang) and raise it in load_misc_binary. After this, even if we set up the misc -> script -> misc loop for binfmts one of them will step on its own bang and exit. I've already sent this patch to mainline. Signed-off-by: Pavel Emelyanov <xemul@openvz.org>