[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[screen-devel] [PATCH] Clear scrollback buffer when locking terminal
From: |
Miroslav Lichvar |
Subject: |
[screen-devel] [PATCH] Clear scrollback buffer when locking terminal |
Date: |
Mon, 18 Jul 2011 17:38:30 +0200 |
Linux kernel 3.0 adds a new command to clear the scrollback buffer in
the linux console. It's available in the ncurses terminfo entry as
extended capability E3. This is useful to prevent an attacker to read
content of a locked terminal via Shift-PgUp key.
---
src/display.c | 6 ++++++
src/extern.h | 1 +
src/screen.c | 1 +
src/term.c | 1 +
4 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/src/display.c b/src/display.c
index 5fa11cb..038c435 100644
--- a/src/display.c
+++ b/src/display.c
@@ -3779,4 +3779,10 @@ char **cmdv;
#endif /* BLANKER_PRG */
+void
+ClearScrollbackBuffer()
+{
+ if (D_CE3)
+ AddCStr(D_CE3);
+}
diff --git a/src/extern.h b/src/extern.h
index c787d99..d3fecf0 100644
--- a/src/extern.h
+++ b/src/extern.h
@@ -316,6 +316,7 @@ extern int color256to88 __P((int));
extern void ResetIdle __P((void));
extern void KillBlanker __P((void));
extern void DisplaySleep1000 __P((int, int));
+extern void ClearScrollbackBuffer __P((void));
/* resize.c */
extern int ChangeWindowSize __P((struct win *, int, int, int));
diff --git a/src/screen.c b/src/screen.c
index cc8f565..3efb67b 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -1967,6 +1967,7 @@ int mode;
#endif
case D_LOCK:
ClearAll();
+ ClearScrollbackBuffer();
sign = SIG_LOCK;
/* tell attacher to lock terminal with a lockprg. */
break;
diff --git a/src/term.c b/src/term.c
index 991de1b..7485900 100644
--- a/src/term.c
+++ b/src/term.c
@@ -83,6 +83,7 @@ struct term term[T_N] =
{ "CD", T_STR },
{ "ce", T_STR },
{ "cb", T_STR },
+ { "E3", T_STR },
/* initialise */
{ "is", T_STR },
--
1.7.6
[Prev in Thread] |
Current Thread |
[Next in Thread] |
- [screen-devel] [PATCH] Clear scrollback buffer when locking terminal,
Miroslav Lichvar <=