diff options
| author | Johan Hovold <johan@kernel.org> | 2021-12-01 14:25:27 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-01-14 18:50:52 -0500 |
| commit | 1b656e9aad7f4886ed466094d1dc5ee4dd900d20 (patch) | |
| tree | c4949f1f63be97950852a2289dcc3f4fecfb5dcd /drivers | |
| parent | 6004e351da50565fb561be85d45151dc9c370023 (diff) | |
| download | linux-1b656e9aad7f4886ed466094d1dc5ee4dd900d20.tar.bz2 | |
firmware: qemu_fw_cfg: fix sysfs information leak
Make sure to always NUL-terminate file names retrieved from the firmware
to avoid accessing data beyond the entry slab buffer and exposing it
through sysfs in case the firmware data is corrupt.
Fixes: 75f3e8e47f38 ("firmware: introduce sysfs driver for QEMU's fw_cfg device")
Cc: stable@vger.kernel.org # 4.6
Cc: Gabriel Somlo <somlo@cmu.edu>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20211201132528.30025-4-johan@kernel.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/firmware/qemu_fw_cfg.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c index ccb7ed62452f..f08e056ed0ae 100644 --- a/drivers/firmware/qemu_fw_cfg.c +++ b/drivers/firmware/qemu_fw_cfg.c @@ -598,7 +598,7 @@ static int fw_cfg_register_file(const struct fw_cfg_file *f) /* set file entry information */ entry->size = be32_to_cpu(f->size); entry->select = be16_to_cpu(f->select); - memcpy(entry->name, f->name, FW_CFG_MAX_FILE_PATH); + strscpy(entry->name, f->name, FW_CFG_MAX_FILE_PATH); /* register entry under "/sys/firmware/qemu_fw_cfg/by_key/" */ err = kobject_init_and_add(&entry->kobj, &fw_cfg_sysfs_entry_ktype, |