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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>
This commit is contained in:
Hridya Valsaraju 2019-09-04 13:07:04 +02:00 committed by Greg Kroah-Hartman
parent c165d8947b
commit 028fb5822b
1 changed files with 12 additions and 0 deletions
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12
drivers/android/binderfs.c
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@ -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,