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tty: Make tty_files_lock per-tty

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Access to tty->tty_files list is always per-tty, never for all ttys
simultaneously. Replace global tty_files_lock spinlock with per-tty
->files_lock. Initialize when the ->tty_files list is inited, in
alloc_tty_struct().

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley
2016-01-09 21:35:23 -08:00
committed by Greg Kroah-Hartman
parent 527ffc11e1
commit 4a51096937
3 changed files with 15 additions and 16 deletions
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4
security/selinux/hooks.c
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@@ -2415,7 +2415,7 @@ static inline void flush_unauthorized_files(const struct cred *cred,
tty = get_current_tty();
if (tty) {
spin_lock(&tty_files_lock);
spin_lock(&tty->files_lock);
if (!list_empty(&tty->tty_files)) {
struct tty_file_private *file_priv;
@@ -2430,7 +2430,7 @@ static inline void flush_unauthorized_files(const struct cred *cred,
if (file_path_has_perm(cred, file, FILE__READ | FILE__WRITE))
drop_tty = 1;
}
spin_unlock(&tty_files_lock);
spin_unlock(&tty->files_lock);
tty_kref_put(tty);
}
/* Reset controlling tty. */