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59 lines
1.5 KiB
59 lines
1.5 KiB
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/display.c b/display.c
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index a4d953a..9ce34dd 100644
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--- a/display.c
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+++ b/display.c
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@@ -4079,4 +4079,10 @@ 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/extern.h b/extern.h
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index bb7d3fb..a2678e3 100644
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--- a/extern.h
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+++ b/extern.h
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@@ -319,6 +319,7 @@ 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/screen.c b/screen.c
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index c50952b..2fee7fa 100644
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--- a/screen.c
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+++ b/screen.c
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@@ -1950,6 +1950,7 @@ void Detach(int mode)
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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/term.c b/term.c
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index c92d85a..a6e9200 100644
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--- a/term.c
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+++ b/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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