azlig and Milan Broz reported that when the tty layer is done with a buffer, the data can hang around in it for a very long time. That sometimes can "leak" to userspace under some conditions. Because of this, just zero out the data after the tty layer is finished with it, for buffers that we "think" should be zeroed out. v2 - addressed some review comments on the 2/2 patch. Greg Kroah-Hartman (1): tty: wipe buffer if not echoing data Linus Torvalds (1): tty: wipe buffer. drivers/tty/n_tty.c | 20 +++++++++++++++++--- drivers/tty/tty_buffer.c | 6 +++++- 2 files changed, 22 insertions(+), 4 deletions(-) -- 2.19.0
