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ksmbd: replace one-element arrays with flexible-array members

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One-element arrays are deprecated, and we are replacing them with flexible
array members instead. So, replace one-element arrays with flexible-array
members in multiple structs in fs/ksmbd/smb_common.h and one in
fs/ksmbd/smb2pdu.h.

Important to mention is that doing a build before/after this patch results
in no binary output differences.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE routines
on memcpy() and help us make progress towards globally enabling
-fstrict-flex-arrays=3 [1].

Link: https://github.com/KSPP/linux/issues/242
Link: https://github.com/KSPP/linux/issues/79
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/Y3OxronfaPYv9qGP@work
This commit is contained in:
Gustavo A. R. Silva 2022-11-15 09:35:10 -06:00 committed by Kees Cook
parent d662198e03
commit d272e01fa0
3 changed files with 9 additions and 9 deletions
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4
fs/ksmbd/smb2pdu.c
View File

@ -3438,7 +3438,7 @@ static int smb2_populate_readdir_entry(struct ksmbd_conn *conn, int info_level,
goto free_conv_name;
}
struct_sz = readdir_info_level_struct_sz(info_level) - 1 + conv_len;
struct_sz = readdir_info_level_struct_sz(info_level) + conv_len;
next_entry_offset = ALIGN(struct_sz, KSMBD_DIR_INFO_ALIGNMENT);
d_info->last_entry_off_align = next_entry_offset - struct_sz;
@ -3690,7 +3690,7 @@ static int reserve_populate_dentry(struct ksmbd_dir_info *d_info,
return -EOPNOTSUPP;
conv_len = (d_info->name_len + 1) * 2;
next_entry_offset = ALIGN(struct_sz - 1 + conv_len,
next_entry_offset = ALIGN(struct_sz + conv_len,
KSMBD_DIR_INFO_ALIGNMENT);
if (next_entry_offset > d_info->out_buf_len) {

2
fs/ksmbd/smb2pdu.h
View File

@ -443,7 +443,7 @@ struct smb2_posix_info {
/* SidBuffer contain two sids (UNIX user sid(16), UNIX group sid(16)) */
u8 SidBuffer[32];
__le32 name_len;
u8 name[1];
u8 name[];
/*
* var sized owner SID
* var sized group SID

12
fs/ksmbd/smb_common.h
View File

@ -277,14 +277,14 @@ struct file_directory_info {
__le64 AllocationSize;
__le32 ExtFileAttributes;
__le32 FileNameLength;
char FileName[1];
char FileName[];
} __packed; /* level 0x101 FF resp data */
struct file_names_info {
__le32 NextEntryOffset;
__u32 FileIndex;
__le32 FileNameLength;
char FileName[1];
char FileName[];
} __packed; /* level 0xc FF resp data */
struct file_full_directory_info {
@ -299,7 +299,7 @@ struct file_full_directory_info {
__le32 ExtFileAttributes;
__le32 FileNameLength;
__le32 EaSize;
char FileName[1];
char FileName[];
} __packed; /* level 0x102 FF resp */
struct file_both_directory_info {
@ -317,7 +317,7 @@ struct file_both_directory_info {
__u8 ShortNameLength;
__u8 Reserved;
__u8 ShortName[24];
char FileName[1];
char FileName[];
} __packed; /* level 0x104 FFrsp data */
struct file_id_both_directory_info {
@ -337,7 +337,7 @@ struct file_id_both_directory_info {
__u8 ShortName[24];
__le16 Reserved2;
__le64 UniqueId;
char FileName[1];
char FileName[];
} __packed;
struct file_id_full_dir_info {
@ -354,7 +354,7 @@ struct file_id_full_dir_info {
__le32 EaSize; /* EA size */
__le32 Reserved;
__le64 UniqueId; /* inode num - le since Samba puts ino in low 32 bit*/
char FileName[1];
char FileName[];
} __packed; /* level 0x105 FF rsp data */
struct smb_version_values {