Re: [PATCH] ecryptfs: Annotate struct ecryptfs_message with __counted_by
Tyler Hicks <[email protected]>
| Newsgroups | org.kernel.vger.ecryptfs,org.kernel.vger.linux-hardening,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <aWWiuLuqdhIIPgkJ@yaupon> |
On 2026-01-12 12:53:11, Thorsten Blum wrote: > Add the __counted_by() compiler attribute to the flexible array member > 'data' to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and > CONFIG_FORTIFY_SOURCE. > > Signed-off-by: Thorsten Blum <[email protected]> Nice! I wasn't aware of this attribute. I'm surprised it isn't documented under Documentation/. Acked-by: Tyler Hicks <[email protected]> Thank you! Tyler > --- > fs/ecryptfs/ecryptfs_kernel.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h > index 62a2ea7f59ed..f58b12be8267 100644 > --- a/fs/ecryptfs/ecryptfs_kernel.h > +++ b/fs/ecryptfs/ecryptfs_kernel.h > @@ -359,7 +359,7 @@ struct ecryptfs_message { > /* Inherits from msg_ctx->index */ > u32 index; > u32 data_len; > - u8 data[]; > + u8 data[] __counted_by(data_len); > }; > > struct ecryptfs_msg_ctx { > -- > Thorsten Blum <[email protected]> > GPG: 1D60 735E 8AEF 3BE4 73B6 9D84 7336 78FD 8DFE EAD4 >