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exec: introduce finalize_exec() before start_thread()

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Provide a final callback into fs/exec.c before start_thread() takes
over, to handle any last-minute changes, like the coming restoration of
the stack limit.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Ben Hutchings <[email protected]>
Cc: Ben Hutchings <[email protected]>
Cc: Brad Spengler <[email protected]>
Cc: Greg KH <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: "Jason A. Donenfeld" <[email protected]>
Cc: Laura Abbott <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Willy Tarreau <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kees Cook 2018-04-10 16:34:57 -07:00 • committed by Linus Torvalds
commit b838383133
6 changed files with 11 additions and 0 deletions
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6
fs/exec.c
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@ -1384,6 +1384,12 @@ void setup_new_exec(struct linux_binprm * bprm)
}
EXPORT_SYMBOL(setup_new_exec);
/* Runs immediately before start_thread() takes over. */
void finalize_exec(struct linux_binprm *bprm)
{
}
EXPORT_SYMBOL(finalize_exec);
/*
* Prepare credentials and lock ->cred_guard_mutex.
* install_exec_creds() commits the new creds and drops the lock.