diff options
| -rw-r--r-- | sys/kern/kern_descrip.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c index da67530..d4c9885 100644 --- a/sys/kern/kern_descrip.c +++ b/sys/kern/kern_descrip.c @@ -149,6 +149,7 @@ fd_rw(unsigned int fd, void *buf, size_t count, uint8_t write) { char *kbuf = NULL; ssize_t n; + uint32_t seal; struct filedesc *filedes; struct sio_txn sio; scret_t retval = 0; @@ -159,8 +160,17 @@ fd_rw(unsigned int fd, void *buf, size_t count, uint8_t write) } filedes = fd_get(fd); - kbuf = dynalloc(count); + seal = filedes->flags; + /* Check the seal */ + if (write && !ISSET(seal, O_ALLOW_WR)) { + return -EPERM; + } + if (!write && ISSET(seal, O_WRONLY)) { + return -EPERM; + } + + kbuf = dynalloc(count); if (kbuf == NULL) { retval = -ENOMEM; goto done; |