From: Gustavo A. R. Silva <gustavo@embeddedor.com>
Date: Tue, 24 Mar 2020 00:38:18 +0000 (-0500)
Subject: tpm_eventlog.h: Replace zero-length array with flexible-array member
X-Git-Tag: Ubuntu-5.13.0-19.19~6197^2~3
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=06ccf63da5d8e90e4dff8b741972a9b279b5bf4c;p=mirror_ubuntu-jammy-kernel.git

tpm_eventlog.h: Replace zero-length array with flexible-array member

The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---

diff --git a/include/linux/tpm_eventlog.h b/include/linux/tpm_eventlog.h
index 131ea1bad458..c253461b1c4e 100644
--- a/include/linux/tpm_eventlog.h
+++ b/include/linux/tpm_eventlog.h
@@ -28,7 +28,7 @@ struct tcpa_event {
 	u32 event_type;
 	u8 pcr_value[20];	/* SHA1 */
 	u32 event_size;
-	u8 event_data[0];
+	u8 event_data[];
 };
 
 enum tcpa_event_types {
@@ -55,7 +55,7 @@ enum tcpa_event_types {
 struct tcpa_pc_event {
 	u32 event_id;
 	u32 event_size;
-	u8 event_data[0];
+	u8 event_data[];
 };
 
 enum tcpa_pc_event_ids {
@@ -102,7 +102,7 @@ struct tcg_pcr_event {
 
 struct tcg_event_field {
 	u32 event_size;
-	u8 event[0];
+	u8 event[];
 } __packed;
 
 struct tcg_pcr_event2_head {