lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Mon, 9 Oct 2023 15:52:59 -0600
From: "Gustavo A. R. Silva" <>
To: Johan Hovold <>, Alex Elder <>,
	Greg Kroah-Hartman <>
	"Gustavo A. R. Silva" <>,
Subject: [PATCH][next] staging: greybus: Add __counted_by for struct
 apr_rx_buf and use struct_size()

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family

While there, use struct_size() helper, instead of the open-coded
version, to calculate the size for the allocation of the whole
flexible structure, including of course, the flexible-array member.

This code was found with the help of Coccinelle, and audited and
fixed manually.

Signed-off-by: Gustavo A. R. Silva <>
 drivers/staging/greybus/raw.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/greybus/raw.c b/drivers/staging/greybus/raw.c
index a00978c8e1d2..b9c6eff7cdc1 100644
--- a/drivers/staging/greybus/raw.c
+++ b/drivers/staging/greybus/raw.c
@@ -29,7 +29,7 @@ struct gb_raw {
 struct raw_data {
 	struct list_head entry;
 	u32 len;
-	u8 data[];
+	u8 data[] __counted_by(len);
 static const struct class raw_class = {
@@ -73,7 +73,7 @@ static int receive_data(struct gb_raw *raw, u32 len, u8 *data)
 		goto exit;
-	raw_data = kmalloc(sizeof(*raw_data) + len, GFP_KERNEL);
+	raw_data = kmalloc(struct_size(raw_data, data, len), GFP_KERNEL);
 	if (!raw_data) {
 		retval = -ENOMEM;
 		goto exit;

Powered by blists - more mailing lists