On Mon 25-03-24 19:36:02, Gustavo A. R. Silva wrote: > Use the `DEFINE_FLEX()` helper for an on-stack definition of a > flexible structure where the size of the flexible-array member > is known at compile-time, and refactor the rest of the code, > accordingly. > > So, with these changes, fix the following warning: > fs/notify/fdinfo.c:45:36: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] > > Link: https://github.com/KSPP/linux/issues/202 > Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx> Nice! I've added the patch to my tree. Honza > --- > Changes in v2: > - Use DEFINE_FLEX() instead of struct_group_tagged(). > > v1: > - Link: https://lore.kernel.org/linux-hardening/ZeeaRuTpuxInH6ZB@neat/ > > fs/notify/fdinfo.c | 20 ++++++++------------ > 1 file changed, 8 insertions(+), 12 deletions(-) > > diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c > index 5c430736ec12..dec553034027 100644 > --- a/fs/notify/fdinfo.c > +++ b/fs/notify/fdinfo.c > @@ -41,29 +41,25 @@ static void show_fdinfo(struct seq_file *m, struct file *f, > #if defined(CONFIG_EXPORTFS) > static void show_mark_fhandle(struct seq_file *m, struct inode *inode) > { > - struct { > - struct file_handle handle; > - u8 pad[MAX_HANDLE_SZ]; > - } f; > + DEFINE_FLEX(struct file_handle, f, f_handle, handle_bytes, MAX_HANDLE_SZ); > int size, ret, i; > > - f.handle.handle_bytes = sizeof(f.pad); > - size = f.handle.handle_bytes >> 2; > + size = f->handle_bytes >> 2; > > - ret = exportfs_encode_fid(inode, (struct fid *)f.handle.f_handle, &size); > + ret = exportfs_encode_fid(inode, (struct fid *)f->f_handle, &size); > if ((ret == FILEID_INVALID) || (ret < 0)) { > WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret); > return; > } > > - f.handle.handle_type = ret; > - f.handle.handle_bytes = size * sizeof(u32); > + f->handle_type = ret; > + f->handle_bytes = size * sizeof(u32); > > seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:", > - f.handle.handle_bytes, f.handle.handle_type); > + f->handle_bytes, f->handle_type); > > - for (i = 0; i < f.handle.handle_bytes; i++) > - seq_printf(m, "%02x", (int)f.handle.f_handle[i]); > + for (i = 0; i < f->handle_bytes; i++) > + seq_printf(m, "%02x", (int)f->f_handle[i]); > } > #else > static void show_mark_fhandle(struct seq_file *m, struct inode *inode) > -- > 2.34.1 > -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
