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TIOCSTI: Document CAP_SYS_ADMIN behaviour in Kconfig

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Clarifies that the LEGACY_TIOCSTI setting is safe to turn off even
when running BRLTTY, as it was introduced in commit 690c8b804a
("TIOCSTI: always enable for CAP_SYS_ADMIN").

Signed-off-by: Günther Noack <gnoack3000@gmail.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Link: https://lore.kernel.org/r/20230808201115.23993-1-gnoack3000@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Günther Noack 2023-08-08 22:11:12 +02:00 committed by Greg Kroah-Hartman
parent dfe2aeb226
commit 3f29d9ee32
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/Kconfig
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@ -164,6 +164,9 @@ config LEGACY_TIOCSTI
userspace depends on this functionality to continue operating
normally.
Processes which run with CAP_SYS_ADMIN, such as BRLTTY, can
use TIOCSTI even when this is set to N.
This functionality can be changed at runtime with the
dev.tty.legacy_tiocsti sysctl. This configuration option sets
the default value of the sysctl.