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authorKees Cook <keescook@chromium.org>2018-02-26 16:04:20 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-02-27 10:17:33 +0100
commitc396a5bf457fb60159dcedbd4f48d53a62be030a (patch)
tree7204e7a8f557baf359c0788796658997614d8a58 /drivers/video/console
parent209f668cd29d2b6b9f39a0b9f179ee40f47c2014 (diff)
console: Expand dummy functions for CFI
This expands the no-op dummy functions into full prototypes to avoid indirect call mismatches when running under Control Flow Integrity checking, like with Clang's -fsanitize=cfi. Co-Developed-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/video/console')
-rw-r--r--drivers/video/console/dummycon.c69
-rw-r--r--drivers/video/console/newport_con.c10
-rw-r--r--drivers/video/console/vgacon.c20
3 files changed, 67 insertions, 32 deletions
diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
index b90ef96e43d6..f2eafe2ed980 100644
--- a/drivers/video/console/dummycon.c
+++ b/drivers/video/console/dummycon.c
@@ -41,12 +41,47 @@ static void dummycon_init(struct vc_data *vc, int init)
vc_resize(vc, DUMMY_COLUMNS, DUMMY_ROWS);
}
-static int dummycon_dummy(void)
+static void dummycon_deinit(struct vc_data *vc) { }
+static void dummycon_clear(struct vc_data *vc, int sy, int sx, int height,
+ int width) { }
+static void dummycon_putc(struct vc_data *vc, int c, int ypos, int xpos) { }
+static void dummycon_putcs(struct vc_data *vc, const unsigned short *s,
+ int count, int ypos, int xpos) { }
+static void dummycon_cursor(struct vc_data *vc, int mode) { }
+
+static bool dummycon_scroll(struct vc_data *vc, unsigned int top,
+ unsigned int bottom, enum con_scroll dir,
+ unsigned int lines)
+{
+ return false;
+}
+
+static int dummycon_switch(struct vc_data *vc)
{
- return 0;
+ return 0;
}
-#define DUMMY (void *)dummycon_dummy
+static int dummycon_blank(struct vc_data *vc, int blank, int mode_switch)
+{
+ return 0;
+}
+
+static int dummycon_font_set(struct vc_data *vc, struct console_font *font,
+ unsigned int flags)
+{
+ return 0;
+}
+
+static int dummycon_font_default(struct vc_data *vc,
+ struct console_font *font, char *name)
+{
+ return 0;
+}
+
+static int dummycon_font_copy(struct vc_data *vc, int con)
+{
+ return 0;
+}
/*
* The console `switch' structure for the dummy console
@@ -55,19 +90,19 @@ static int dummycon_dummy(void)
*/
const struct consw dummy_con = {
- .owner = THIS_MODULE,
- .con_startup = dummycon_startup,
- .con_init = dummycon_init,
- .con_deinit = DUMMY,
- .con_clear = DUMMY,
- .con_putc = DUMMY,
- .con_putcs = DUMMY,
- .con_cursor = DUMMY,
- .con_scroll = DUMMY,
- .con_switch = DUMMY,
- .con_blank = DUMMY,
- .con_font_set = DUMMY,
- .con_font_default = DUMMY,
- .con_font_copy = DUMMY,
+ .owner = THIS_MODULE,
+ .con_startup = dummycon_startup,
+ .con_init = dummycon_init,
+ .con_deinit = dummycon_deinit,
+ .con_clear = dummycon_clear,
+ .con_putc = dummycon_putc,
+ .con_putcs = dummycon_putcs,
+ .con_cursor = dummycon_cursor,
+ .con_scroll = dummycon_scroll,
+ .con_switch = dummycon_switch,
+ .con_blank = dummycon_blank,
+ .con_font_set = dummycon_font_set,
+ .con_font_default = dummycon_font_default,
+ .con_font_copy = dummycon_font_copy,
};
EXPORT_SYMBOL_GPL(dummy_con);
diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index 42d02a206059..6897bd0fc00e 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -673,14 +673,14 @@ static bool newport_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
return true;
}
-static int newport_dummy(struct vc_data *c)
+static int newport_set_origin(struct vc_data *vc)
{
return 0;
}
-#define DUMMY (void *) newport_dummy
+static void newport_save_screen(struct vc_data *vc) { }
-const struct consw newport_con = {
+static const struct consw newport_con = {
.owner = THIS_MODULE,
.con_startup = newport_startup,
.con_init = newport_init,
@@ -694,8 +694,8 @@ const struct consw newport_con = {
.con_blank = newport_blank,
.con_font_set = newport_font_set,
.con_font_default = newport_font_default,
- .con_set_origin = DUMMY,
- .con_save_screen = DUMMY
+ .con_set_origin = newport_set_origin,
+ .con_save_screen = newport_save_screen
};
static int newport_probe(struct gio_device *dev,
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index a17ba1465815..f09e17b60e45 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -1272,7 +1272,8 @@ static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight)
return 0;
}
-static int vgacon_font_set(struct vc_data *c, struct console_font *font, unsigned flags)
+static int vgacon_font_set(struct vc_data *c, struct console_font *font,
+ unsigned int flags)
{
unsigned charcount = font->charcount;
int rc;
@@ -1407,21 +1408,20 @@ static bool vgacon_scroll(struct vc_data *c, unsigned int t, unsigned int b,
* The console `switch' structure for the VGA based console
*/
-static int vgacon_dummy(struct vc_data *c)
-{
- return 0;
-}
-
-#define DUMMY (void *) vgacon_dummy
+static void vgacon_clear(struct vc_data *vc, int sy, int sx, int height,
+ int width) { }
+static void vgacon_putc(struct vc_data *vc, int c, int ypos, int xpos) { }
+static void vgacon_putcs(struct vc_data *vc, const unsigned short *s,
+ int count, int ypos, int xpos) { }
const struct consw vga_con = {
.owner = THIS_MODULE,
.con_startup = vgacon_startup,
.con_init = vgacon_init,
.con_deinit = vgacon_deinit,
- .con_clear = DUMMY,
- .con_putc = DUMMY,
- .con_putcs = DUMMY,
+ .con_clear = vgacon_clear,
+ .con_putc = vgacon_putc,
+ .con_putcs = vgacon_putcs,
.con_cursor = vgacon_cursor,
.con_scroll = vgacon_scroll,
.con_switch = vgacon_switch,