From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Thu, 9 Jun 2022 11:29:36 -0700 Subject: [PATCH] netfs: gcc-12: temporarily disable '-Wattribute-warning' for now MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit [ Upstream commit 507160f46c55913955d272ebf559d63809a8e560 ] This is a pure band-aid so that I can continue merging stuff from people while some of the gcc-12 fallout gets sorted out. In particular, gcc-12 is very unhappy about the kinds of pointer arithmetic tricks that netfs does, and that makes the fortify checks trigger in afs and ceph: In function ‘fortify_memset_chk’, inlined from ‘netfs_i_context_init’ at include/linux/netfs.h:327:2, inlined from ‘afs_set_netfs_context’ at fs/afs/inode.c:61:2, inlined from ‘afs_root_iget’ at fs/afs/inode.c:543:2: include/linux/fortify-string.h:258:25: warning: call to ‘__write_overflow_field’ declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribute-warning] 258 | __write_overflow_field(p_size_field, size); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ and the reason is that netfs_i_context_init() is passed a 'struct inode' pointer, and then it does struct netfs_i_context *ctx = netfs_i_context(inode); memset(ctx, 0, sizeof(*ctx)); where that netfs_i_context() function just does pointer arithmetic on the inode pointer, knowing that the netfs_i_context is laid out immediately after it in memory. This is all truly disgusting, since the whole "netfs_i_context is laid out immediately after it in memory" is not actually remotely true in general, but is just made to be that way for afs and ceph. See for example fs/cifs/cifsglob.h: struct cifsInodeInfo { struct { /* These must be contiguous */ struct inode vfs_inode; /* the VFS's inode record */ struct netfs_i_context netfs_ctx; /* Netfslib context */ }; [...] and realize that this is all entirely wrong, and the pointer arithmetic that netfs_i_context() is doing is also very very wrong and wouldn't give the right answer if netfs_ctx had different alignment rules from a 'struct inode', for example). Anyway, that's just a long-winded way to say "the gcc-12 warning is actually quite reasonable, and our code happens to work but is pretty disgusting". This is getting fixed properly, but for now I made the mistake of thinking "the week right after the merge window tends to be calm for me as people take a breather" and I did a sustem upgrade. And I got gcc-12 as a result, so to continue merging fixes from people and not have the end result drown in warnings, I am fixing all these gcc-12 issues I hit. Including with these kinds of temporary fixes. Cc: Kees Cook Cc: David Howells Link: https://lore.kernel.org/all/AEEBCF5D-8402-441D-940B-105AA718C71F@chromium.org/ Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- fs/afs/inode.c | 3 +++ fs/ceph/inode.c | 3 +++ 2 files changed, 6 insertions(+) diff --git a/fs/afs/inode.c b/fs/afs/inode.c index 30b066299d39f70a450539823dbe75602427e81a..65b439cd53d29c78701fa62f98433f5058907166 100644 --- a/fs/afs/inode.c +++ b/fs/afs/inode.c @@ -25,6 +25,9 @@ #include "internal.h" #include "afs_fs.h" +// Temporary: netfs does disgusting things with inode pointers +#pragma GCC diagnostic ignored "-Wattribute-warning" + static const struct inode_operations afs_symlink_inode_operations = { .get_link = page_get_link, }; diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index 63113e2a4890763e255048c31a0b228cdba13a22..83739dae52687d94837d2e0babb5c7852d31686f 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -20,6 +20,9 @@ #include "cache.h" #include +// Temporary: netfs does disgusting things with inode pointers +#pragma GCC diagnostic ignored "-Wattribute-warning" + /* * Ceph inode operations *