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Date: Fri, 14 Oct 2022 21:16:23 -0700 From: Kees Cook <keescook@...omium.org> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Kees Cook <keescook@...omium.org>, Jiri Slaby <jirislaby@...nel.org>, Simon Brand <simon.brand@...tadigitale.de>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH 1/2] tty: Move sysctl setup into "core" tty logic In preparation for adding another sysctl to the tty subsystem, move the tty setup code into the "core" tty code, which contains tty_init() itself. Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Jiri Slaby <jirislaby@...nel.org> Signed-off-by: Kees Cook <keescook@...omium.org> --- drivers/tty/tty.h | 2 +- drivers/tty/tty_io.c | 34 ++++++++++++++++++++++++++++++++-- drivers/tty/tty_ldisc.c | 38 +------------------------------------- 3 files changed, 34 insertions(+), 40 deletions(-) diff --git a/drivers/tty/tty.h b/drivers/tty/tty.h index f310a8274df1..4938ed3a44a5 100644 --- a/drivers/tty/tty.h +++ b/drivers/tty/tty.h @@ -93,7 +93,7 @@ void tty_ldisc_release(struct tty_struct *tty); int __must_check tty_ldisc_init(struct tty_struct *tty); void tty_ldisc_deinit(struct tty_struct *tty); -void tty_sysctl_init(void); +int tty_ldisc_autoload; /* tty_audit.c */ #ifdef CONFIG_AUDIT diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 82a8855981f7..b397b223eada 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -3581,13 +3581,44 @@ void console_sysfs_notify(void) sysfs_notify(&consdev->kobj, NULL, "active"); } +static struct ctl_table tty_table[] = { + { + .procname = "ldisc_autoload", + .data = &tty_ldisc_autoload, + .maxlen = sizeof(tty_ldisc_autoload), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = SYSCTL_ZERO, + .extra2 = SYSCTL_ONE, + }, + { } +}; + +static struct ctl_table tty_dir_table[] = { + { + .procname = "tty", + .mode = 0555, + .child = tty_table, + }, + { } +}; + +static struct ctl_table tty_root_table[] = { + { + .procname = "dev", + .mode = 0555, + .child = tty_dir_table, + }, + { } +}; + /* * Ok, now we can initialize the rest of the tty devices and can count * on memory allocations, interrupts etc.. */ int __init tty_init(void) { - tty_sysctl_init(); + register_sysctl_table(tty_root_table); cdev_init(&tty_cdev, &tty_fops); if (cdev_add(&tty_cdev, MKDEV(TTYAUX_MAJOR, 0), 1) || register_chrdev_region(MKDEV(TTYAUX_MAJOR, 0), 1, "/dev/tty") < 0) @@ -3609,4 +3640,3 @@ int __init tty_init(void) #endif return 0; } - diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index 776d8a62f77c..e758f44729e7 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -117,7 +117,7 @@ static void put_ldops(struct tty_ldisc_ops *ldops) raw_spin_unlock_irqrestore(&tty_ldiscs_lock, flags); } -static int tty_ldisc_autoload = IS_BUILTIN(CONFIG_LDISC_AUTOLOAD); +int tty_ldisc_autoload = IS_BUILTIN(CONFIG_LDISC_AUTOLOAD); /** * tty_ldisc_get - take a reference to an ldisc @@ -817,39 +817,3 @@ void tty_ldisc_deinit(struct tty_struct *tty) tty_ldisc_put(tty->ldisc); tty->ldisc = NULL; } - -static struct ctl_table tty_table[] = { - { - .procname = "ldisc_autoload", - .data = &tty_ldisc_autoload, - .maxlen = sizeof(tty_ldisc_autoload), - .mode = 0644, - .proc_handler = proc_dointvec, - .extra1 = SYSCTL_ZERO, - .extra2 = SYSCTL_ONE, - }, - { } -}; - -static struct ctl_table tty_dir_table[] = { - { - .procname = "tty", - .mode = 0555, - .child = tty_table, - }, - { } -}; - -static struct ctl_table tty_root_table[] = { - { - .procname = "dev", - .mode = 0555, - .child = tty_dir_table, - }, - { } -}; - -void tty_sysctl_init(void) -{ - register_sysctl_table(tty_root_table); -} -- 2.34.1
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