From 98ce2f265f986fb88c38d508286bb5e3716b9e74 Mon Sep 17 00:00:00 2001 From: Christian Persch Date: Sat, 19 May 2012 18:04:12 +0000 Subject: emulation: Limit repetitions Don't allow malicious sequences to cause excessive repetitions. https://bugzilla.gnome.org/show_bug.cgi?id=676090 --- diff --git a/src/vteseq.c b/src/vteseq.c index 46def5b..7fb4707 100644 --- a/src/vteseq.c +++ b/src/vteseq.c @@ -1397,7 +1397,7 @@ vte_sequence_handler_dc (VteTerminal *terminal, GValueArray *params) static void vte_sequence_handler_DC (VteTerminal *terminal, GValueArray *params) { - vte_sequence_handler_multiple(terminal, params, vte_sequence_handler_dc); + vte_sequence_handler_multiple_r(terminal, params, vte_sequence_handler_dc); } /* Delete a line at the current cursor position. */ @@ -1790,7 +1790,7 @@ vte_sequence_handler_reverse_index (VteTerminal *terminal, GValueArray *params) static void vte_sequence_handler_RI (VteTerminal *terminal, GValueArray *params) { - vte_sequence_handler_multiple(terminal, params, vte_sequence_handler_nd); + vte_sequence_handler_multiple_r(terminal, params, vte_sequence_handler_nd); } /* Save cursor (position). */ @@ -2782,8 +2782,7 @@ vte_sequence_handler_insert_lines (VteTerminal *terminal, GValueArray *params) { GValue *value; VteScreen *screen; - long param, end, row; - int i; + long param, end, row, i, limit; screen = terminal->pvt->screen; /* The default is one. */ param = 1; @@ -2801,7 +2800,13 @@ vte_sequence_handler_insert_lines (VteTerminal *terminal, GValueArray *params) } else { end = screen->insert_delta + terminal->row_count - 1; } - /* Insert the new lines at the cursor. */ + + /* Only allow to insert as many lines as there are between this row + * and the end of the scrolling region. See bug #676090. + */ + limit = end - row + 1; + param = MIN (param, limit); + for (i = 0; i < param; i++) { /* Clear a line off the end of the region and add one to the * top of the region. */ @@ -2822,8 +2827,7 @@ vte_sequence_handler_delete_lines (VteTerminal *terminal, GValueArray *params) { GValue *value; VteScreen *screen; - long param, end, row; - int i; + long param, end, row, i, limit; screen = terminal->pvt->screen; /* The default is one. */ @@ -2842,6 +2846,13 @@ vte_sequence_handler_delete_lines (VteTerminal *terminal, GValueArray *params) } else { end = screen->insert_delta + terminal->row_count - 1; } + + /* Only allow to delete as many lines as there are between this row + * and the end of the scrolling region. See bug #676090. + */ + limit = end - row + 1; + param = MIN (param, limit); + /* Clear them from below the current cursor. */ for (i = 0; i < param; i++) { /* Insert a line at the end of the region and remove one from -- cgit v0.9.0.2 2019-01-09 14:47:53 +0100'>2019-01-09build: Require Guile 2.2....Ludovic Courtès 2018-12-02Make Guile-JSON a required dependency....Eric Bavier 2018-11-23Update Guile-SQLite3 URL everywhere....Ludovic Courtès 2018-09-04Switch to Guile-Gcrypt....Ludovic Courtès 2018-06-27doc: Specify Guile-SQLite3 minimum version....Ludovic Courtès 2018-06-14build: Require Guile-SQLite3....Ludovic Courtès 2018-02-26build: Require Guile >= 2.0.13....Ludovic Courtès 2018-01-07doc: Mark zlib as mandatory, libbz2 as optional....Ludovic Courtès 2018-01-01doc: Update requirements in 'README'....Mathieu Lirzin 2017-09-25README: Replace http:// with https:// where applicable.Marius Bakke 2017-03-18build: Require Guile >= 2.0.9....Ludovic Courtès 2017-01-30maint: Fix invalid calls to 'info'....Mathieu Lirzin