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2021-04-15tty: move some internal tty lock enums and functions out of tty.hGreg Kroah-Hartman4-27/+28
Move the TTY_LOCK_* enums and tty_ldisc lock functions out of the global tty.h into the local header file to clean things up. Cc: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20210408125134.3016837-10-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-15tty: audit: move some local functions out of tty.hGreg Kroah-Hartman3-10/+15
The functions tty_audit_add_data() and tty_audit_tiocsti() are local to the tty core code, and do not need to be in a "kernel-wide" header file so move them to drivers/tty/tty.h Cc: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20210408125134.3016837-9-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-15tty: tty.h: remove tty_info()Greg Kroah-Hartman1-1/+0
No one is calling this macro, and no one should, so remove it from the .h file. Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Cc: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20210408125134.3016837-3-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-15tty: create internal tty.h fileGreg Kroah-Hartman8-12/+27
There are a number of functions and #defines in include/linux/tty.h that do not belong there as they are private to the tty core code. Create an initial drivers/tty/tty.h file and copy the odd "tty logging" macros into it to seed the file with some initial things that we know nothing outside of the tty core should be calling. Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Cc: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20210408125134.3016837-2-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-15tty: n_gsm: check error while registering tty devicesHillf Danton1-2/+12
Add the error path for registering tty devices and roll back in case of error in bid to avoid the UAF like the below one reported. Plus syzbot reported general protection fault in cdev_del() on Sep 24, 2020 and both cases are down to the kobject_put() in tty_cdev_add(). ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 8923 at lib/refcount.c:28 refcount_warn_saturate+0x1cf/0x210 -origin/lib/refcount.c:28 Modules linked in: CPU: 1 PID: 8923 Comm: executor Not tainted 5.12.0-rc5+ #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:refcount_warn_saturate+0x1cf/0x210 -origin/lib/refcount.c:28 Code: 4f ff ff ff e8 32 fa b5 fe 48 c7 c7 3d f8 f6 86 e8 d6 ab c6 fe c6 05 7c 34 67 04 01 48 c7 c7 68 f8 6d 86 31 c0 e8 81 2e 9d fe <0f> 0b e9 22 ff ff ff e8 05 fa b5 fe 48 c7 c7 3e f8 f6 86 e8 a9 ab RSP: 0018:ffffc90001633c60 EFLAGS: 00010246 RAX: 15d08b2e34b77800 RBX: 0000000000000003 RCX: ffff88804c056c80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000003 R08: ffffffff813767aa R09: 0001ffffffffffff R10: 0001ffffffffffff R11: ffff88804c056c80 R12: ffff888040b7d000 R13: ffff88804c206938 R14: ffff88804c206900 R15: ffff888041b18488 FS: 00000000022c9940(0000) GS:ffff88807ec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9f9b122008 CR3: 0000000044b4b000 CR4: 0000000000750ee0 PKRU: 55555554 Call Trace: __refcount_sub_and_test -origin/./include/linux/refcount.h:283 [inline] __refcount_dec_and_test -origin/./include/linux/refcount.h:315 [inline] refcount_dec_and_test -origin/./include/linux/refcount.h:333 [inline] kref_put -origin/./include/linux/kref.h:64 [inline] kobject_put+0x17b/0x180 -origin/lib/kobject.c:753 cdev_del+0x4b/0x50 -origin/fs/char_dev.c:597 tty_unregister_device+0x99/0xd0 -origin/drivers/tty/tty_io.c:3343 gsmld_detach_gsm -origin/drivers/tty/n_gsm.c:2409 [inline] gsmld_close+0x6c/0x140 -origin/drivers/tty/n_gsm.c:2478 tty_ldisc_close -origin/drivers/tty/tty_ldisc.c:488 [inline] tty_ldisc_kill -origin/drivers/tty/tty_ldisc.c:636 [inline] tty_ldisc_release+0x1b6/0x400 -origin/drivers/tty/tty_ldisc.c:809 tty_release_struct+0x19/0xb0 -origin/drivers/tty/tty_io.c:1714 tty_release+0x9ad/0xa00 -origin/drivers/tty/tty_io.c:1885 __fput+0x260/0x4e0 -origin/fs/file_table.c:280 ____fput+0x11/0x20 -origin/fs/file_table.c:313 task_work_run+0x8e/0x110 -origin/kernel/task_work.c:140 tracehook_notify_resume -origin/./include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop -origin/kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x16b/0x1a0 -origin/kernel/entry/common.c:208 __syscall_exit_to_user_mode_work -origin/kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 -origin/kernel/entry/common.c:301 do_syscall_64+0x45/0x80 -origin/arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported-by: syzbot+c49fe6089f295a05e6f8@syzkaller.appspotmail.com Reported-and-tested-by: Hao Sun <sunhao.th@gmail.com> Signed-off-by: Hillf Danton <hdanton@sina.com> Link: https://lore.kernel.org/r/20210412035758.1974-1-hdanton@sina.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-15dt-bindings: serial: 8250: add aspeed, lpc-io-reg and aspeed, lpc-interruptsZev Weiss1-3/+24
These correspond to the existing lpc_address, sirq, and sirq_polarity sysfs attributes; the second element of aspeed,lpc-interrupts provides a replacement for the deprecated aspeed,sirq-polarity-sense property. Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Zev Weiss <zev@bewilderbeest.net> Link: https://lore.kernel.org/r/20210412034712.16778-5-zev@bewilderbeest.net Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-15serial: 8250_aspeed_vuart: add aspeed, lpc-io-reg and aspeed, lpc-interrupts ↵Zev Weiss1-2/+49
DT properties These allow describing all the Aspeed VUART attributes currently available via sysfs. aspeed,lpc-interrupts provides a replacement for the deprecated aspeed,sirq-polarity-sense property. Reviewed-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Zev Weiss <zev@bewilderbeest.net> Link: https://lore.kernel.org/r/20210412034712.16778-4-zev@bewilderbeest.net Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-15serial: 8250_aspeed_vuart: refactor sirq and lpc address setting codeZev Weiss1-16/+35
This splits dedicated aspeed_vuart_set_{sirq,lpc_address}() functions out of the sysfs store functions in preparation for adding DT properties that will be poking the same registers. While we're at it, these functions now provide some basic bounds-checking on their arguments. Reviewed-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Zev Weiss <zev@bewilderbeest.net> Link: https://lore.kernel.org/r/20210412034712.16778-3-zev@bewilderbeest.net Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-15dt-bindings: serial: 8250: deprecate aspeed, sirq-polarity-senseZev Weiss1-0/+1
This property ties SIRQ polarity to SCU register bits that don't necessarily have any direct relationship to it; the only use of it was removed in commit c82bf6e133d3 ("ARM: aspeed: g5: Do not set sirq polarity"). Reviewed-by: Joel Stanley <joel@jms.id.au> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Zev Weiss <zev@bewilderbeest.net> Link: https://lore.kernel.org/r/20210412034712.16778-2-zev@bewilderbeest.net Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: hvc: make symbol 'hvc_udbg_dev' staticYu Kuai1-1/+1
The sparse tool complains as follows: drivers/tty/hvc/hvc_udbg.c:20:19: warning: symbol 'hvc_udbg_dev' was not declared. Should it be static? This symbol is not used outside of hvc_udbg.c, so this commit marks it static. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20210407125826.4139130-1-yukuai3@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: clarify that not all ttys have a class deviceJohan Hovold1-1/+1
Commit 30004ac9c090 ("tty: add tty_struct->dev pointer to corresponding device instance") added a struct device pointer field to struct tty_struct which was populated with the corresponding tty class device during initialisation. Unfortunately, not all ttys have a class device (e.g. pseudoterminals and serdev) in which case the device pointer will be set to NULL, something which have bit driver authors over the years. In retrospect perhaps this field should never have been added, but let's at least document the current behaviour. Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210409073512.6876-1-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10serial: Add missing MODULE_DEVICE_TABLEBixuan Cui1-0/+1
This patch adds missing MODULE_DEVICE_TABLE definition which generates correct modalias for automatic loading of this driver when it is built as an external module. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Bixuan Cui <cuibixuan@huawei.com> Link: https://lore.kernel.org/r/20210410035048.11466-1-cuibixuan@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10dt-bindings: serial: samsung: include generic dtschema to match bluetooth childKrzysztof Kozlowski1-1/+3
Include the generic serial.yaml dtschema so the child node like "bluetooth" will be properly matched: arch/arm/boot/dts/exynos4210-universal_c210.dt.yaml: serial@13800000: 'bluetooth' does not match any of the regexes: 'pinctrl-[0-9]+' Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20210409172027.11296-1-krzysztof.kozlowski@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10serial: core: return early on unsupported ioctlsJohan Hovold1-3/+3
Drivers can return -ENOIOCTLCMD when an ioctl is not recognised to tell the upper layers to continue looking for a handler. This is not the case for the RS485 and ISO7816 ioctls whose handlers should return -ENOTTY directly in case a serial driver does not implement the corresponding methods. Fixes: a5f276f10ff7 ("serial_core: Handle TIOC[GS]RS485 ioctls.") Fixes: ad8c0eaa0a41 ("tty/serial_core: add ISO7816 infrastructure") Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407095208.31838-9-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10serial: core: drop redundant TIOCGSERIAL memsetJohan Hovold1-2/+0
Since commit 5099d234a52a ("serial_core: switch to ->[sg]et_serial()") the serial structure passed to uart_get_info() has already have been cleared by the tty layer so drop the redundant memset. Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407095208.31838-8-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: add ASYNC_SPLIT_TERMIOS to deprecation maskJohan Hovold1-2/+2
Callout devices are long-gone, but the ASYNC_SPLIT_TERMIOS flag was never added to the deprecation mask. Add it so that a warning is printed if it is ever used. Fixes: 8a8ae62f8296 ("tty: warn on deprecated serial flags") Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407095208.31838-7-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: refactor TIOCSSERIAL handlingJohan Hovold1-17/+16
Factor out the deprecated serial flags handling and tty-operation check shared with the compat TIOCSSERIAL handler. Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407095208.31838-6-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: use pr_warn_ratelimited() for deprecated serial flagsJohan Hovold1-12/+6
Use pr_warn_ratelimited() when warning about deprecated serial flags instead of open coding. Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407095208.31838-5-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: fix return value for unsupported termiox ioctlsJohan Hovold1-2/+2
Drivers should return -ENOTTY ("Inappropriate I/O control operation") when an ioctl isn't supported, while -EINVAL is used for invalid arguments. Support for termiox was added by commit 1d65b4a088de ("tty: Add termiox") in 2008 but no driver support ever followed and it was recently ripped out by commit e0efb3168d34 ("tty: Remove dead termiox code"). Fix the return value for the unsupported termiox ioctls, which have always returned -EINVAL, by explicitly returning -ENOTTY rather than removing them completely and falling back to the default unrecognised- ioctl handling. Fixes: 1d65b4a088de ("tty: Add termiox") Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407095208.31838-4-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: fix return value for unsupported ioctlsJohan Hovold2-6/+6
Drivers should return -ENOTTY ("Inappropriate I/O control operation") when an ioctl isn't supported, while -EINVAL is used for invalid arguments. Fix up the TIOCMGET, TIOCMSET and TIOCGICOUNT helpers which returned -EINVAL when a tty driver did not implement the corresponding operations. Note that the TIOCMGET and TIOCMSET helpers predate git and do not get a corresponding Fixes tag below. Fixes: d281da7ff6f7 ("tty: Make tiocgicount a handler") Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407095208.31838-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: actually undefine superseded ASYNC flagsJohan Hovold1-2/+2
Some kernel-internal ASYNC flags have been superseded by tty-port flags and should no longer be used by kernel drivers. Fix the misspelled "__KERNEL__" compile guards which failed their sole purpose to break out-of-tree drivers that have not yet been updated. Fixes: 5c0517fefc92 ("tty: core: Undefine ASYNC_* flags superceded by TTY_PORT* flags") Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407095208.31838-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: tty_ldisc: Remove the repeated word 'the'Xiaofei Tan1-1/+1
Remove the repeated word 'the' following advice of checkpatch.pl Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Link: https://lore.kernel.org/r/1617779210-51576-11-git-send-email-tanxiaofei@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: tty_ldisc: Do not use assignment in if conditionXiaofei Tan1-1/+2
Do not use assignment in if condition following the advice of checkpatch.pl. Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Link: https://lore.kernel.org/r/1617779210-51576-10-git-send-email-tanxiaofei@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: tty_ldisc: Fix coding style issues of block commentsXiaofei Tan1-12/+20
Fix coding style issues of block comments, reported by checkpatch.pl. Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Link: https://lore.kernel.org/r/1617779210-51576-9-git-send-email-tanxiaofei@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: tty_ldisc: Add a blank line after declarationsXiaofei Tan1-0/+2
Add a blank line after declarations, reported by checkpatch.pl. Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Link: https://lore.kernel.org/r/1617779210-51576-8-git-send-email-tanxiaofei@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: tty_ldisc: Fix an issue of code indent should use tabsXiaofei Tan1-1/+1
Fix an issue of code indent should use tabs, reported by checkpatch.pl. Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Link: https://lore.kernel.org/r/1617779210-51576-7-git-send-email-tanxiaofei@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: tty_jobctrl: Remove spaces before tabsXiaofei Tan1-4/+4
Remove spaces before tabs following the advice of checkpatch.pl. Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Link: https://lore.kernel.org/r/1617779210-51576-6-git-send-email-tanxiaofei@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: tty_jobctrl: Fix coding style issues of block commentsXiaofei Tan1-6/+10
Fix coding style issues of block comments, reported by checkpatch.pl. Besides, do some expression optimization for the sentenses. Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Link: https://lore.kernel.org/r/1617779210-51576-5-git-send-email-tanxiaofei@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty: tty_jobctrl: Add a blank line after declarationsXiaofei Tan1-0/+5
Add a blank line after declarations, reported by checkpatch.pl. Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Link: https://lore.kernel.org/r/1617779210-51576-4-git-send-email-tanxiaofei@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty/sysrq: Fix issues of code indent should use tabsXiaofei Tan1-17/+17
Fix issues of code indent should use tabs, reported by checkpatch.pl. Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Link: https://lore.kernel.org/r/1617779210-51576-3-git-send-email-tanxiaofei@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-10tty/sysrq: Add a blank line after declarationsXiaofei Tan1-0/+1
Add a blank line after declarations, reported by checkpatch.pl. Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Link: https://lore.kernel.org/r/1617779210-51576-2-git-send-email-tanxiaofei@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-09tty: pti: Remove Kconfig leftoversAndy Shevchenko1-30/+0
The commit 8ba59e9dee31 ("misc: pti: Remove driver for deprecated platform") got rid of deprecated drivers under TTY subsystem, but cleaned only one Kconfig entry. Remove Kconfig leftovers. Fixes: 8ba59e9dee31 ("misc: pti: Remove driver for deprecated platform") Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210406131615.85432-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07tty: synclink_gt: drop redundant tty-port initialisationJohan Hovold1-2/+0
The port close_delay and closing_wait parameters have already been by tty_port_init() so drop the redundant driver initialisation to the default values. Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-17-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07pcmcia: synclink_cs: drop redundant tty-port initialisationJohan Hovold1-2/+0
The port close_delay and closing_wait parameters have already been by tty_port_init() so drop the redundant driver initialisation to the default values. Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-16-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07tty: mxser: fix TIOCSSERIAL permission checkJohan Hovold1-3/+4
Changing the port type and closing_wait parameter are privileged operations so make sure to return -EPERM if a regular user tries to change them. Note that the closing_wait parameter would not actually have been changed but the return value did not indicate that. Cc: stable@vger.kernel.org Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-15-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07tty: mxser: fix TIOCSSERIAL jiffies conversionsJohan Hovold1-6/+18
The port close_delay and closing wait parameters set by TIOCSSERIAL are specified in jiffies, while the values returned by TIOCGSERIAL are specified in centiseconds. Add the missing conversions so that TIOCSSERIAL works as expected also when HZ is not 100. Cc: stable@vger.kernel.org Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-14-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07tty: moxa: fix TIOCSSERIAL implementationJohan Hovold1-5/+0
TIOCSSERIAL is a horrid, underspecified, legacy interface which for most serial devices is only useful for setting the close_delay and closing_wait parameters. A non-privileged user has only ever been able to set the since long deprecated ASYNC_SPD flags and trying to change any other *supported* feature should result in -EPERM being returned. Setting the current values for any supported features should return success. Fix the moxa implementation which was returning -EPERM also for a privileged user when trying to change certain unsupported parameters and instead return success consistently. Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-13-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07tty: moxa: fix TIOCSSERIAL permission checkJohan Hovold1-5/+11
Changing the port close delay or type are privileged operations so make sure to return -EPERM if a regular user tries to change them. Cc: stable@vger.kernel.org Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-12-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07tty: moxa: fix TIOCSSERIAL jiffies conversionsJohan Hovold1-2/+2
The port close_delay parameter set by TIOCSSERIAL is specified in jiffies, while the value returned by TIOCGSERIAL is specified in centiseconds. Add the missing conversions so that TIOCGSERIAL works as expected also when HZ is not 100. Cc: stable@vger.kernel.org Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-11-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07tty: amiserial: add missing TIOCSSERIAL jiffies conversionsJohan Hovold1-7/+19
The tty-port close_delay and closing_wait parameters set by TIOCSSERIAL are specified in jiffies, while the values returned by TIOCGSERIAL are specified in centiseconds. Add the missing conversions so that TIOCSSERIAL works as expected also if this code is ever reused on a system where HZ is not 100. Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-10-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07tty: amiserial: fix TIOCSSERIAL permission checkJohan Hovold1-0/+1
Changing the port closing_wait parameter is a privileged operation. Add the missing check to TIOCSSERIAL so that -EPERM is returned in case an unprivileged user tries to change the closing-wait setting. Cc: stable@vger.kernel.org Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-9-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07staging: greybus: uart: clean up TIOCGSERIALJohan Hovold1-3/+0
TIOCSSERIAL is a horrid, underspecified, legacy interface which for most serial devices is only useful for setting the close_delay and closing_wait parameters. The xmit_fifo_size parameter could be used to set the hardware transmit fifo size of a legacy UART when it could not be detected, but the interface is limited to eight bits and should be left unset when not used. Similarly, baud_base could be used to set the UART base clock when it could not be detected but might as well be left unset when it is not known. The type parameter could be used to set the UART type, but is better left unspecified (type unknown) when it isn't used. Note that some applications have historically expected TIOCGSERIAL to be implemented, but judging from the Debian sources, the port type not being PORT_UNKNOWN is only used to check for the existence of legacy serial ports (ttySn). Notably USB serial drivers like ftdi_sio have been using PORT_UNKNOWN for twenty years without any problems. Drop the bogus values provided by the greybus implementation. Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-8-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07staging: greybus: uart: fix unprivileged TIOCCSERIALJohan Hovold1-2/+0
TIOCSSERIAL is a horrid, underspecified, legacy interface which for most serial devices is only useful for setting the close_delay and closing_wait parameters. A non-privileged user has only ever been able to set the since long deprecated ASYNC_SPD flags and trying to change any other *supported* feature should result in -EPERM being returned. Setting the current values for any supported features should return success. Fix the greybus implementation which instead indicated that the TIOCSSERIAL ioctl was not even implemented when a non-privileged user set the current values. Fixes: e68453ed28c5 ("greybus: uart-gb: now builds, more framework added") Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-7-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07staging: greybus: uart: fix TIOCSSERIAL jiffies conversionsJohan Hovold1-4/+7
The port close_delay and closing_wait parameters set by TIOCSSERIAL are specified in jiffies and not milliseconds. Add the missing conversions so that TIOCSSERIAL works as expected also when HZ is not 1000. Fixes: e68453ed28c5 ("greybus: uart-gb: now builds, more framework added") Cc: stable@vger.kernel.org # 4.9 Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-6-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07staging: fwserial: fix TIOCGSERIAL implementationJohan Hovold1-4/+3
TIOCSSERIAL is a horrid, underspecified, legacy interface which for most serial devices is only useful for setting the close_delay and closing_wait parameters. The xmit_fifo_size parameter could be used to set the hardware transmit fifo size of a legacy UART when it could not be detected, but the interface is limited to eight bits and should be left unset when not used. Fix the fwserial implementation by dropping its custom interpretation of the unused xmit_fifo_size field, which was overflowed with the driver FIFO size. Also leave the type and flags fields unset as these cannot be changed. The close_delay and closing_wait parameters returned by TIOCGSERIAL are specified in centiseconds. The driver does not yet support changing closing_wait, but let's report back the default value actually used (30 seconds). Fixes: 7355ba3445f2 ("staging: fwserial: Add TTY-over-Firewire serial driver") Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-5-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07staging: fwserial: fix TIOCSSERIAL implementationJohan Hovold1-4/+0
TIOCSSERIAL is a horrid, underspecified, legacy interface which for most serial devices is only useful for setting the close_delay and closing_wait parameters. A non-privileged user has only ever been able to set the since long deprecated ASYNC_SPD flags and trying to change any other *supported* feature should result in -EPERM being returned. Setting the current values for any supported features should return success. Fix the fwserial implementation which was returning -EPERM also for a privileged user when trying to change certain unsupported parameters, and instead return success consistently. Fixes: 7355ba3445f2 ("staging: fwserial: Add TTY-over-Firewire serial driver") Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-4-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07staging: fwserial: fix TIOCSSERIAL permission checkJohan Hovold1-2/+6
Changing the port close-delay parameter is a privileged operation so make sure to return -EPERM if a regular user tries to change it. Fixes: 7355ba3445f2 ("staging: fwserial: Add TTY-over-Firewire serial driver") Cc: stable@vger.kernel.org # 3.8 Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07staging: fwserial: fix TIOCSSERIAL jiffies conversionsJohan Hovold1-2/+2
The port close_delay parameter set by TIOCSSERIAL is specified in jiffies, while the value returned by TIOCGSERIAL is specified in centiseconds. Add the missing conversions so that TIOCGSERIAL works as expected also when HZ is not 100. Fixes: 7355ba3445f2 ("staging: fwserial: Add TTY-over-Firewire serial driver") Cc: stable@vger.kernel.org # 3.8 Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210407102334.32361-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-07tty: n_gsm: use DEFINE_SPINLOCK() for spinlockGuobin Huang1-3/+1
spinlock can be initialized automatically with DEFINE_SPINLOCK() rather than explicitly calling spin_lock_init(). Reported-by: Hulk Robot <hulkci@huawei.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Guobin Huang <huangguobin4@huawei.com> Link: https://lore.kernel.org/r/1617710163-48158-1-git-send-email-huangguobin4@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-05sc16is7xx: Defer probe if device read failsAnnaliese McDermond1-1/+1
A test was added to the probe function to ensure the device was actually connected and working before successfully completing a probe. If the device was actually there, but the I2C bus was not ready yet for whatever reason, the probe fails permanently. Change the probe so that we defer the probe on a regmap read failure so that we try the probe again when the dependent drivers are potentially loaded. This should not affect the case where the device truly isn't present because the probe will never successfully complete. Fixes: 2aa916e67db3 ("sc16is7xx: Read the LSR register for basic device presence check") Cc: stable@vger.kernel.org Signed-off-by: Annaliese McDermond <nh6z@nh6z.net> Link: https://lore.kernel.org/r/010101787f9c3fd8-c1815c00-2d6b-4c85-a96a-a13e68597fda-000000@us-west-2.amazonses.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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