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authorHridya Valsaraju <hridya@google.com>2019-09-04 13:07:04 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-09-04 13:17:35 +0200
commit028fb5822b76bc2e095b5c145d7bd263878d9e27 (patch)
treed9fb6b0bd85dd276d16a28769c3b9d4da226b2e3 /drivers/android
parentc165d8947bc41ebd3b0de3f520490cffb627af90 (diff)
downloadlinux-028fb5822b76bc2e095b5c145d7bd263878d9e27.tar.bz2
binder: Validate the default binderfs device names.
Length of a binderfs device name cannot exceed BINDERFS_MAX_NAME. This patch adds a check in binderfs_init() to ensure the same for the default binder devices that will be created in every binderfs instance. Co-developed-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Hridya Valsaraju <hridya@google.com> Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Link: https://lore.kernel.org/r/20190808222727.132744-3-hridya@google.com Link: https://lore.kernel.org/r/20190904110704.8606-3-christian.brauner@ubuntu.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/android')
-rw-r--r--drivers/android/binderfs.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
index e773f45d19d9..d8307cccbef8 100644
--- a/drivers/android/binderfs.c
+++ b/drivers/android/binderfs.c
@@ -553,6 +553,18 @@ static struct file_system_type binder_fs_type = {
int __init init_binderfs(void)
{
int ret;
+ const char *name;
+ size_t len;
+
+ /* Verify that the default binderfs device names are valid. */
+ name = binder_devices_param;
+ for (len = strcspn(name, ","); len > 0; len = strcspn(name, ",")) {
+ if (len > BINDERFS_MAX_NAME)
+ return -E2BIG;
+ name += len;
+ if (*name == ',')
+ name++;
+ }
/* Allocate new major number for binderfs. */
ret = alloc_chrdev_region(&binderfs_dev, 0, BINDERFS_MAX_MINOR,