tests: Mock the mode_t variant of open

open has a second form with a mode_t argument. When mocking without this
argument a caller trying to O_CREAT would have their mode_t argument
discarded and a random stack variable would be used instead.

BUG=b:187647884
BRANCH=None
TEST=meson test

Change-Id: I8c134e6d36a248d0f51985e389085a9e585fb83d
Signed-off-by: Evan Benn <evanbenn@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/69263
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

4 files changed, 35 insertions, 17 deletions

diff --git a/tests/io_mock.h b/tests/io_mock.h
index 935e84b2..020794af 100644
--- a/tests/io_mock.h
+++ b/tests/io_mock.h
@@ -49,11 +49,6 @@ struct pci_dev {
 	unsigned int device_id;
 };
 
-/* POSIX open() flags, avoiding dependency on fcntl.h */
-#define O_RDONLY 0
-#define O_WRONLY 1
-#define O_RDWR 2
-
 /* Linux I2C interface constants, avoiding linux/i2c-dev.h */
 #define I2C_SLAVE 0x0703
 
@@ -107,7 +102,7 @@ struct io_mock {
 	int (*libusb_handle_events_timeout)(void *state, libusb_context *ctx, struct timeval *tv);
 
 	/* POSIX File I/O */
-	int (*iom_open)(void *state, const char *pathname, int flags);
+	int (*iom_open)(void *state, const char *pathname, int flags, mode_t mode);
 	int (*iom_ioctl)(void *state, int fd, unsigned long request, va_list args);
 	int (*iom_read)(void *state, int fd, void *buf, size_t sz);
 	int (*iom_write)(void *state, int fd, const void *buf, size_t sz);
diff --git a/tests/tests.c b/tests/tests.c
index abbac643..b517898f 100644
--- a/tests/tests.c
+++ b/tests/tests.c
@@ -75,10 +75,10 @@ uint8_t __wrap_sio_read(uint16_t port, uint8_t reg)
 	return (uint8_t)mock();
 }
 
-static int mock_open(const char *pathname, int flags)
+static int mock_open(const char *pathname, int flags, mode_t mode)
 {
 	if (get_io() && get_io()->iom_open)
-		return get_io()->iom_open(get_io()->state, pathname, flags);
+		return get_io()->iom_open(get_io()->state, pathname, flags, mode);
 
 	if (get_io() && get_io()->fallback_open_state) {
 		struct io_mock_fallback_open_state *io_state;
@@ -96,22 +96,43 @@ static int mock_open(const char *pathname, int flags)
 	return MOCK_FD;
 }
 
-int __wrap_open(const char *pathname, int flags)
+int __wrap_open(const char *pathname, int flags, ...)
 {
 	LOG_ME;
-	return mock_open(pathname, flags);
+	mode_t mode = 0;
+	if (flags & O_CREAT) {
+		va_list ap;
+		va_start(ap, flags);
+		mode = va_arg(ap, mode_t);
+		va_end(ap);
+	}
+	return mock_open(pathname, flags, mode);
 }
 
-int __wrap_open64(const char *pathname, int flags)
+int __wrap_open64(const char *pathname, int flags, ...)
 {
 	LOG_ME;
-	return mock_open(pathname, flags);
+	mode_t mode = 0;
+	if (flags & O_CREAT) {
+		va_list ap;
+		va_start(ap, flags);
+		mode = va_arg(ap, mode_t);
+		va_end(ap);
+	}
+	return mock_open(pathname, flags, mode);
 }
 
-int __wrap___open64_2(const char *pathname, int flags)
+int __wrap___open64_2(const char *pathname, int flags, ...)
 {
 	LOG_ME;
-	return mock_open(pathname, flags);
+	mode_t mode = 0;
+	if (flags & O_CREAT) {
+		va_list ap;
+		va_start(ap, flags);
+		mode = va_arg(ap, mode_t);
+		va_end(ap);
+	}
+	return mock_open(pathname, flags, mode);
 }
 
 int __wrap_ioctl(int fd, unsigned long int request, ...)
diff --git a/tests/tests.h b/tests/tests.h
index b36ac70d..6a12fdb0 100644
--- a/tests/tests.h
+++ b/tests/tests.h
@@ -16,6 +16,8 @@
 #ifndef TESTS_H
 #define TESTS_H
 
+#include <fcntl.h>
+
 /* helpers.c */
 void address_to_bits_test_success(void **state);
 void bitcount_test_success(void **state);
diff --git a/tests/wraps.h b/tests/wraps.h
index f97eaba4..e224d79b 100644
--- a/tests/wraps.h
+++ b/tests/wraps.h
@@ -28,9 +28,9 @@ struct pci_dev *__wrap_pcidev_init(const struct programmer_cfg *cfg, void *devs,
 uintptr_t __wrap_pcidev_readbar(void *dev, int bar);
 void __wrap_sio_write(uint16_t port, uint8_t reg, uint8_t data);
 uint8_t __wrap_sio_read(uint16_t port, uint8_t reg);
-int __wrap_open(const char *pathname, int flags);
-int __wrap_open64(const char *pathname, int flags);
-int __wrap___open64_2(const char *pathname, int flags);
+int __wrap_open(const char *pathname, int flags, ...);
+int __wrap_open64(const char *pathname, int flags, ...);
+int __wrap___open64_2(const char *pathname, int flags, ...);
 int __wrap_ioctl(int fd, unsigned long int request, ...);
 int __wrap_write(int fd, const void *buf, size_t sz);
 int __wrap_read(int fd, void *buf, size_t sz);