6.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Günther Noack <gnoack3000@xxxxxxxxx>
commit 3f29d9ee323ae5cda59d144d1f8b0b10ea065be0 upstream.
Clarifies that the LEGACY_TIOCSTI setting is safe to turn off even
when running BRLTTY, as it was introduced in commit 690c8b804ad2
("TIOCSTI: always enable for CAP_SYS_ADMIN").
Signed-off-by: Günther Noack <gnoack3000@xxxxxxxxx>
Reviewed-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230808201115.23993-1-gnoack3000@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/Kconfig | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/tty/Kconfig
+++ b/drivers/tty/Kconfig
@@ -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.
