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9p: move xattr-related structs to .rodata

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This makes it harder for accidental or malicious changes to
v9fs_xattr_user_handler, v9fs_xattr_trusted_handler,
v9fs_xattr_security_handler, or v9fs_xattr_handlers at runtime.

Cc: Eric Van Hensbergen <ericvh@kernel.org>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Cc: Dominique Martinet <asmadeus@codewreck.org>
Cc: Christian Schoenebeck <linux_oss@crudebyte.com>
Cc: v9fs@lists.linux.dev
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
Link: https://lore.kernel.org/r/20230930050033.41174-4-wedsonaf@gmail.com
Acked-by: Dominique Martinet <asmadeus@codewreck.org>
Reviewed-by: Christian Schoenebeck <linux_oss@crudebyte.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Wedson Almeida Filho 2023-09-30 02:00:07 -03:00 committed by Christian Brauner
parent e60ac12833
commit b6079dc9cb
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GPG Key ID: 91C61BC06578DCA2
2 changed files with 5 additions and 5 deletions
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8
fs/9p/xattr.c
View File

@ -162,27 +162,27 @@ static int v9fs_xattr_handler_set(const struct xattr_handler *handler,
return v9fs_xattr_set(dentry, full_name, value, size, flags); return v9fs_xattr_set(dentry, full_name, value, size, flags);
} }
static struct xattr_handler v9fs_xattr_user_handler = { static const struct xattr_handler v9fs_xattr_user_handler = {
.prefix = XATTR_USER_PREFIX, .prefix = XATTR_USER_PREFIX,
.get = v9fs_xattr_handler_get, .get = v9fs_xattr_handler_get,
.set = v9fs_xattr_handler_set, .set = v9fs_xattr_handler_set,
}; };
static struct xattr_handler v9fs_xattr_trusted_handler = { static const struct xattr_handler v9fs_xattr_trusted_handler = {
.prefix = XATTR_TRUSTED_PREFIX, .prefix = XATTR_TRUSTED_PREFIX,
.get = v9fs_xattr_handler_get, .get = v9fs_xattr_handler_get,
.set = v9fs_xattr_handler_set, .set = v9fs_xattr_handler_set,
}; };
#ifdef CONFIG_9P_FS_SECURITY #ifdef CONFIG_9P_FS_SECURITY
static struct xattr_handler v9fs_xattr_security_handler = { static const struct xattr_handler v9fs_xattr_security_handler = {
.prefix = XATTR_SECURITY_PREFIX, .prefix = XATTR_SECURITY_PREFIX,
.get = v9fs_xattr_handler_get, .get = v9fs_xattr_handler_get,
.set = v9fs_xattr_handler_set, .set = v9fs_xattr_handler_set,
}; };
#endif #endif
const struct xattr_handler *v9fs_xattr_handlers[] = { const struct xattr_handler * const v9fs_xattr_handlers[] = {
&v9fs_xattr_user_handler, &v9fs_xattr_user_handler,
&v9fs_xattr_trusted_handler, &v9fs_xattr_trusted_handler,
#ifdef CONFIG_9P_FS_SECURITY #ifdef CONFIG_9P_FS_SECURITY

2
fs/9p/xattr.h
View File

@ -10,7 +10,7 @@
#include <net/9p/9p.h> #include <net/9p/9p.h>
#include <net/9p/client.h> #include <net/9p/client.h>
extern const struct xattr_handler *v9fs_xattr_handlers[]; extern const struct xattr_handler * const v9fs_xattr_handlers[];
ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name, ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
void *buffer, size_t buffer_size); void *buffer, size_t buffer_size);