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[PATCH v2 042/109] virtiofsd: add fuse_mbuf_iter API
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[PATCH v2 042/109] virtiofsd: add fuse_mbuf_iter API |
Date: |
Tue, 21 Jan 2020 12:23:26 +0000 |
From: Stefan Hajnoczi <address@hidden>
Introduce an API for consuming bytes from a buffer with size checks.
All FUSE operations will be converted to use this safe API instead of
void *inarg.
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
tools/virtiofsd/buffer.c | 28 ++++++++++++++++++++
tools/virtiofsd/fuse_common.h | 49 ++++++++++++++++++++++++++++++++++-
2 files changed, 76 insertions(+), 1 deletion(-)
diff --git a/tools/virtiofsd/buffer.c b/tools/virtiofsd/buffer.c
index db1885ab19..918e0f41e0 100644
--- a/tools/virtiofsd/buffer.c
+++ b/tools/virtiofsd/buffer.c
@@ -267,3 +267,31 @@ ssize_t fuse_buf_copy(struct fuse_bufvec *dstv, struct
fuse_bufvec *srcv,
return copied;
}
+
+void *fuse_mbuf_iter_advance(struct fuse_mbuf_iter *iter, size_t len)
+{
+ void *ptr;
+
+ if (len > iter->size - iter->pos) {
+ return NULL;
+ }
+
+ ptr = iter->mem + iter->pos;
+ iter->pos += len;
+ return ptr;
+}
+
+const char *fuse_mbuf_iter_advance_str(struct fuse_mbuf_iter *iter)
+{
+ const char *str = iter->mem + iter->pos;
+ size_t remaining = iter->size - iter->pos;
+ size_t i;
+
+ for (i = 0; i < remaining; i++) {
+ if (str[i] == '\0') {
+ iter->pos += i + 1;
+ return str;
+ }
+ }
+ return NULL;
+}
diff --git a/tools/virtiofsd/fuse_common.h b/tools/virtiofsd/fuse_common.h
index bd9bf861f0..deac132081 100644
--- a/tools/virtiofsd/fuse_common.h
+++ b/tools/virtiofsd/fuse_common.h
@@ -747,10 +747,57 @@ size_t fuse_buf_size(const struct fuse_bufvec *bufv);
ssize_t fuse_buf_copy(struct fuse_bufvec *dst, struct fuse_bufvec *src,
enum fuse_buf_copy_flags flags);
+/**
+ * Memory buffer iterator
+ *
+ */
+struct fuse_mbuf_iter {
+ /**
+ * Data pointer
+ */
+ void *mem;
+
+ /**
+ * Total length, in bytes
+ */
+ size_t size;
+
+ /**
+ * Offset from start of buffer
+ */
+ size_t pos;
+};
+
+/* Initialize memory buffer iterator from a fuse_buf */
+#define FUSE_MBUF_ITER_INIT(fbuf) \
+ ((struct fuse_mbuf_iter){ \
+ .mem = fbuf->mem, \
+ .size = fbuf->size, \
+ .pos = 0, \
+ })
+
+/**
+ * Consume bytes from a memory buffer iterator
+ *
+ * @param iter memory buffer iterator
+ * @param len number of bytes to consume
+ * @return pointer to start of consumed bytes or
+ * NULL if advancing beyond end of buffer
+ */
+void *fuse_mbuf_iter_advance(struct fuse_mbuf_iter *iter, size_t len);
+
+/**
+ * Consume a NUL-terminated string from a memory buffer iterator
+ *
+ * @param iter memory buffer iterator
+ * @return pointer to the string or
+ * NULL if advancing beyond end of buffer or there is no NUL-terminator
+ */
+const char *fuse_mbuf_iter_advance_str(struct fuse_mbuf_iter *iter);
+
/*
* Signal handling
*/
-
/**
* Exit session on HUP, TERM and INT signals and ignore PIPE signal
*
--
2.24.1
- [PATCH v2 033/109] virtiofsd: passthrough_ll: create new files in caller's context, (continued)
- [PATCH v2 033/109] virtiofsd: passthrough_ll: create new files in caller's context, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 032/109] virtiofs: Add maintainers entry, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 034/109] virtiofsd: passthrough_ll: add lo_map for ino/fh indirection, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 035/109] virtiofsd: passthrough_ll: add ino_map to hide lo_inode pointers, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 036/109] virtiofsd: passthrough_ll: add dirp_map to hide lo_dirp pointers, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 037/109] virtiofsd: passthrough_ll: add fd_map to hide file descriptors, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 038/109] virtiofsd: passthrough_ll: add fallback for racy ops, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 039/109] virtiofsd: validate path components, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 040/109] virtiofsd: Plumb fuse_bufvec through to do_write_buf, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 041/109] virtiofsd: Pass write iov's all the way through, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 042/109] virtiofsd: add fuse_mbuf_iter API,
Dr. David Alan Gilbert (git) <=
- [PATCH v2 043/109] virtiofsd: validate input buffer sizes in do_write_buf(), Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 045/109] virtiofsd: prevent ".." escape in lo_do_lookup(), Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 044/109] virtiofsd: check input buffer size in fuse_lowlevel.c ops, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 046/109] virtiofsd: prevent ".." escape in lo_do_readdir(), Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 047/109] virtiofsd: use /proc/self/fd/ O_PATH file descriptor, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 048/109] virtiofsd: sandbox mount namespace, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 049/109] virtiofsd: move to an empty network namespace, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 051/109] virtiofsd: add seccomp whitelist, Dr. David Alan Gilbert (git), 2020/01/21