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63 lines
1.7 KiB
63 lines
1.7 KiB
commit 0aec2900f63820c3405ba38a4d1cd67cc22f0715
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Author: Miroslav Lichvar <mlichvar@redhat.com>
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Date: Mon Jul 18 17:26:47 2011 +0200
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Clear scrollback buffer when locking terminal
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Linux kernel 3.0 adds a new command to clear the scrollback buffer in
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the linux console. It's available in the ncurses terminfo entry as
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extended capability E3. This is useful to prevent an attacker to read
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content of a locked terminal via Shift-PgUp key.
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diff --git a/src/display.c b/src/display.c
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index 5fa11cb..038c435 100644
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--- a/src/display.c
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+++ b/src/display.c
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@@ -3779,4 +3779,10 @@ char **cmdv;
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#endif /* BLANKER_PRG */
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+void
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+ClearScrollbackBuffer()
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+{
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+ if (D_CE3)
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+ AddCStr(D_CE3);
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+}
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diff --git a/src/extern.h b/src/extern.h
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index c787d99..d3fecf0 100644
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--- a/src/extern.h
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+++ b/src/extern.h
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@@ -316,6 +316,7 @@ extern int color256to88 __P((int));
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extern void ResetIdle __P((void));
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extern void KillBlanker __P((void));
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extern void DisplaySleep1000 __P((int, int));
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+extern void ClearScrollbackBuffer __P((void));
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/* resize.c */
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extern int ChangeWindowSize __P((struct win *, int, int, int));
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diff --git a/src/screen.c b/src/screen.c
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index cc8f565..3efb67b 100644
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--- a/src/screen.c
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+++ b/src/screen.c
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@@ -1967,6 +1967,7 @@ int mode;
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#endif
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case D_LOCK:
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ClearAll();
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+ ClearScrollbackBuffer();
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sign = SIG_LOCK;
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/* tell attacher to lock terminal with a lockprg. */
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break;
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diff --git a/src/term.c b/src/term.c
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index 991de1b..7485900 100644
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--- a/src/term.c
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+++ b/src/term.c
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@@ -83,6 +83,7 @@ struct term term[T_N] =
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{ "CD", T_STR },
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{ "ce", T_STR },
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{ "cb", T_STR },
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+ { "E3", T_STR },
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/* initialise */
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{ "is", T_STR },
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