commit bc7f0ab193d406260d9305b559705685ca57d27e
author Raymond Mao <raymond.mao@linaro.org> Sat Feb 03 08:36:21 2024 -0800
committer Tom Rini <trini@konsulko.com> Thu Feb 29 09:24:22 2024 -0500
tree 66583957697b633a9f826a7d3a029ee84606f032
parent fe016b6e21b3e9bfb6573a79eea7c01031c092d4

bloblist: check bloblist with specified buffer size

Instead of expecting the bloblist total size to be the same as the
pre-allocated buffer size, practically we are more interested in
whether the pre-allocated buffer size is bigger than the bloblist
total size.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

common/bloblist.c

diff --git a/common/bloblist.c b/common/bloblist.c
index 980b1dd..26b0ba3 100644
--- a/common/bloblist.c
+++ b/common/bloblist.c
@@ -384,7 +384,7 @@
 		return log_msg_ret("Bad magic", -ENOENT);
 	if (hdr->version != BLOBLIST_VERSION)
 		return log_msg_ret("Bad version", -EPROTONOSUPPORT);
-	if (!hdr->total_size || (size && hdr->total_size != size))
+	if (!hdr->total_size || (size && hdr->total_size > size))
 		return log_msg_ret("Bad total size", -EFBIG);
 	if (hdr->used_size > hdr->total_size)
 		return log_msg_ret("Bad used size", -ENOENT);

include/bloblist.h

diff --git a/include/bloblist.h b/include/bloblist.h
index f7e800f..cc78259 100644
--- a/include/bloblist.h
+++ b/include/bloblist.h
@@ -348,12 +348,13 @@
  * bloblist_check() - Check if a bloblist exists
  *
  * @addr: Address of bloblist
- * @size: Expected size of blobsize, or 0 to detect the size
+ * @size: Reserved space size for blobsize, or 0 to use the total size
  * Return: 0 if OK, -ENOENT if the magic number doesn't match (indicating that
- * there problem is no bloblist at the given address), -EPROTONOSUPPORT
+ * there problem is no bloblist at the given address) or any fields for header
+ * size, used size and total size do not match, -EPROTONOSUPPORT
  * if the version does not match, -EIO if the checksum does not match,
- * -EFBIG if the expected size does not match the detected size, -ENOSPC
- * if the size is not large enough to hold the headers
+ * -EFBIG if the reserved space size is small than the total size or total size
+ * is 0
  */
 int bloblist_check(ulong addr, uint size);
 

test/bloblist.c

diff --git a/test/bloblist.c b/test/bloblist.c
index 17d9dd0..7dab9ad 100644
--- a/test/bloblist.c
+++ b/test/bloblist.c
@@ -207,7 +207,7 @@
 	hdr->flags++;
 
 	hdr->total_size--;
-	ut_asserteq(-EFBIG, bloblist_check(TEST_ADDR, TEST_BLOBLIST_SIZE));
+	ut_asserteq(-EIO, bloblist_check(TEST_ADDR, TEST_BLOBLIST_SIZE));
 	hdr->total_size++;
 
 	hdr->spare++;