• Oleg Nesterov's avatar
    exec: copy-and-paste the fixes into compat_do_execve() paths · 114279be
    Oleg Nesterov authored
    Note: this patch targets 2.6.37 and tries to be as simple as possible.
    That is why it adds more copy-and-paste horror into fs/compat.c and
    uglifies fs/exec.c, this will be cleanuped later.
    
    compat_copy_strings() plays with bprm->vma/mm directly and thus has
    two problems: it lacks the RLIMIT_STACK check and argv/envp memory
    is not visible to oom killer.
    
    Export acct_arg_size() and get_arg_page(), change compat_copy_strings()
    to use get_arg_page(), change compat_do_execve() to do acct_arg_size(0)
    as do_execve() does.
    
    Add the fatal_signal_pending/cond_resched checks into compat_count() and
    compat_copy_strings(), this matches the code in fs/exec.c and certainly
    makes sense.
    Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
    Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Cc: stable@kernel.org
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    114279be
compat.c 55.5 KB