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Message-Id: <20240809073309.2134488-3-kees@kernel.org>
Date: Fri, 9 Aug 2024 00:33:04 -0700
From: Kees Cook <kees@...nel.org>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Kees Cook <kees@...nel.org>,
Suren Baghdasaryan <surenb@...gle.com>,
Kent Overstreet <kent.overstreet@...ux.dev>,
Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Roman Gushchin <roman.gushchin@...ux.dev>,
Hyeonggon Yoo <42.hyeyoo@...il.com>,
linux-mm@...ck.org,
"GONG, Ruiqi" <gongruiqi@...weicloud.com>,
Jann Horn <jannh@...gle.com>,
Matteo Rizzo <matteorizzo@...gle.com>,
jvoisin <julien.voisin@...tri.org>,
Xiu Jianfeng <xiujianfeng@...wei.com>,
linux-kernel@...r.kernel.org,
linux-hardening@...r.kernel.org
Subject: [PATCH 3/5] codetag: Introduce codetag_early_walk()
In order to process builtin alloc_tags much earlier during boot (before
register_codetag() is processed), provide codetag_early_walk() that
perform a lockless walk with a specified callback function. This will be
used to allocate required caches that cannot be allocated on demand.
Signed-off-by: Kees Cook <kees@...nel.org>
---
Cc: Suren Baghdasaryan <surenb@...gle.com>
Cc: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Roman Gushchin <roman.gushchin@...ux.dev>
Cc: Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc: linux-mm@...ck.org
---
include/linux/codetag.h | 2 ++
lib/codetag.c | 16 ++++++++++++++++
2 files changed, 18 insertions(+)
diff --git a/include/linux/codetag.h b/include/linux/codetag.h
index c2a579ccd455..9eb1fcd90570 100644
--- a/include/linux/codetag.h
+++ b/include/linux/codetag.h
@@ -64,6 +64,8 @@ void codetag_lock_module_list(struct codetag_type *cttype, bool lock);
bool codetag_trylock_module_list(struct codetag_type *cttype);
struct codetag_iterator codetag_get_ct_iter(struct codetag_type *cttype);
struct codetag *codetag_next_ct(struct codetag_iterator *iter);
+void codetag_early_walk(const struct codetag_type_desc *desc,
+ void (*callback)(struct codetag *ct));
void codetag_to_text(struct seq_buf *out, struct codetag *ct);
diff --git a/lib/codetag.c b/lib/codetag.c
index ef7634c7ee18..9d563c8c088a 100644
--- a/lib/codetag.c
+++ b/lib/codetag.c
@@ -154,6 +154,22 @@ static struct codetag_range get_section_range(struct module *mod,
};
}
+void codetag_early_walk(const struct codetag_type_desc *desc,
+ void (*callback)(struct codetag *ct))
+{
+ struct codetag_range range;
+ struct codetag *ct;
+
+ range = get_section_range(NULL, desc->section);
+ if (!range.start || !range.stop ||
+ range.start == range.stop ||
+ range.start > range.stop)
+ return;
+
+ for (ct = range.start; ct < range.stop; ct = ((void *)ct + desc->tag_size))
+ callback(ct);
+}
+
static int codetag_module_init(struct codetag_type *cttype, struct module *mod)
{
struct codetag_range range;
--
2.34.1
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