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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-03-23 19:38:18 -0500
committerGustavo A. R. Silva <gustavo@embeddedor.com>2020-04-18 15:44:56 -0500
commit06ccf63da5d8e90e4dff8b741972a9b279b5bf4c (patch)
treef0fe16b5642573e5216d51952511b620b372c287 /include
parent4ea19ecf322c2f98ef87fc980b3851625b082ac2 (diff)
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/tpm_eventlog.h6
1 files changed, 3 insertions, 3 deletions
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 {