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| author | Johan Hovold <johan@kernel.org> | 2021-04-08 15:16:01 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-09 16:08:27 +0200 |
| commit | dd5619582d60007139f0447382d2839f4f9e339b (patch) | |
| tree | 757e2017fa0e57e19ac5f2f24039196e7b87088f /drivers/usb/cdns3/cdns3-trace.h | |
| parent | 729f7955cb987c5b7d7e54c87c5ad71c789934f7 (diff) | |
USB: cdc-acm: fix unprivileged TIOCCSERIAL
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 cdc-acm implementation which instead indicated that the
TIOCSSERIAL ioctl was not even implemented when a non-privileged user
set the current values.
Fixes: ba2d8ce9db0a ("cdc-acm: implement TIOCSSERIAL to avoid blocking close(2)")
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210408131602.27956-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/cdns3/cdns3-trace.h')
0 files changed, 0 insertions, 0 deletions