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console: Expand dummy functions for CFI

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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>
This commit is contained in:
Kees Cook
2018-02-26 16:04:20 -08:00
committed by Greg Kroah-Hartman
parent 209f668cd2
commit c396a5bf45
5 changed files with 121 additions and 48 deletions
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67
drivers/usb/misc/sisusbvga/sisusb_con.c
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@@ -1217,7 +1217,7 @@ font_op_error:
/* Interface routine */
static int
sisusbcon_font_set(struct vc_data *c, struct console_font *font,
unsigned flags)
unsigned int flags)
{
struct sisusb_usb_data *sisusb;
unsigned charcount = font->charcount;
@@ -1338,28 +1338,65 @@ static void sisusbdummycon_init(struct vc_data *vc, int init)
vc_resize(vc, 80, 25);
}
static int sisusbdummycon_dummy(void)
static void sisusbdummycon_deinit(struct vc_data *vc) { }
static void sisusbdummycon_clear(struct vc_data *vc, int sy, int sx,
int height, int width) { }
static void sisusbdummycon_putc(struct vc_data *vc, int c, int ypos,
int xpos) { }
static void sisusbdummycon_putcs(struct vc_data *vc, const unsigned short *s,
int count, int ypos, int xpos) { }
static void sisusbdummycon_cursor(struct vc_data *vc, int mode) { }
static bool sisusbdummycon_scroll(struct vc_data *vc, unsigned int top,
unsigned int bottom, enum con_scroll dir,
unsigned int lines)
{
return 0;
return false;
}
#define SISUSBCONDUMMY (void *)sisusbdummycon_dummy
static int sisusbdummycon_switch(struct vc_data *vc)
{
return 0;
}
static int sisusbdummycon_blank(struct vc_data *vc, int blank, int mode_switch)
{
return 0;
}
static int sisusbdummycon_font_set(struct vc_data *vc,
struct console_font *font,
unsigned int flags)
{
return 0;
}
static int sisusbdummycon_font_default(struct vc_data *vc,
struct console_font *font, char *name)
{
return 0;
}
static int sisusbdummycon_font_copy(struct vc_data *vc, int con)
{
return 0;
}
static const struct consw sisusb_dummy_con = {
.owner = THIS_MODULE,
.con_startup = sisusbdummycon_startup,
.con_init = sisusbdummycon_init,
.con_deinit = SISUSBCONDUMMY,
.con_clear = SISUSBCONDUMMY,
.con_putc = SISUSBCONDUMMY,
.con_putcs = SISUSBCONDUMMY,
.con_cursor = SISUSBCONDUMMY,
.con_scroll = SISUSBCONDUMMY,
.con_switch = SISUSBCONDUMMY,
.con_blank = SISUSBCONDUMMY,
.con_font_set = SISUSBCONDUMMY,
.con_font_default = SISUSBCONDUMMY,
.con_font_copy = SISUSBCONDUMMY,
.con_deinit = sisusbdummycon_deinit,
.con_clear = sisusbdummycon_clear,
.con_putc = sisusbdummycon_putc,
.con_putcs = sisusbdummycon_putcs,
.con_cursor = sisusbdummycon_cursor,
.con_scroll = sisusbdummycon_scroll,
.con_switch = sisusbdummycon_switch,
.con_blank = sisusbdummycon_blank,
.con_font_set = sisusbdummycon_font_set,
.con_font_default = sisusbdummycon_font_default,
.con_font_copy = sisusbdummycon_font_copy,
};
int