The patch titled Subject: alloc_tag: fix allocation tag reporting when CONFIG_MODULES=n has been added to the -mm mm-hotfixes-unstable branch. Its filename is alloc_tag-fix-allocation-tag-reporting-when-config_modules=n.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Suren Baghdasaryan surenb@google.com Subject: alloc_tag: fix allocation tag reporting when CONFIG_MODULES=n Date: Wed, 28 Aug 2024 16:15:36 -0700

codetag_module_init() is used to initialize sections containing allocation tags. This function is used to initialize module sections as well as core kernel sections, in which case the module parameter is set to NULL. This function has to be called even when CONFIG_MODULES=n to initialize core kernel allocation tag sections. When CONFIG_MODULES=n, this function is a NOP, which is wrong. This leads to /proc/allocinfo reported as empty. Fix this by making it independent of CONFIG_MODULES.

Link: https://lkml.kernel.org/r/20240828231536.1770519-1-surenb@google.com Fixes: 916cc5167cc6 ("lib: code tagging framework") Signed-off-by: Suren Baghdasaryan surenb@google.com Cc: David Hildenbrand david@redhat.com Cc: Kees Cook keescook@chromium.org Cc: Kent Overstreet kent.overstreet@linux.dev Cc: Pasha Tatashin pasha.tatashin@soleen.com Cc: Sourav Panda souravpanda@google.com Cc: Vlastimil Babka vbabka@suse.cz Cc: stable@vger.kernel.org [6.10+] Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

lib/codetag.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)

--- a/lib/codetag.c~alloc_tag-fix-allocation-tag-reporting-when-config_modules=n +++ a/lib/codetag.c @@ -125,7 +125,6 @@ static inline size_t range_size(const st cttype->desc.tag_size; }

-#ifdef CONFIG_MODULES static void *get_symbol(struct module *mod, const char *prefix, const char *name) { DECLARE_SEQ_BUF(sb, KSYM_NAME_LEN); @@ -155,6 +154,15 @@ static struct codetag_range get_section_ }; }

+static const char *get_mod_name(__maybe_unused struct module *mod) +{ +#ifdef CONFIG_MODULES + if (mod) + return mod->name; +#endif + return "(built-in)"; +} + static int codetag_module_init(struct codetag_type *cttype, struct module *mod) { struct codetag_range range; @@ -164,8 +172,7 @@ static int codetag_module_init(struct co range = get_section_range(mod, cttype->desc.section); if (!range.start || !range.stop) { pr_warn("Failed to load code tags of type %s from the module %s\n", - cttype->desc.section, - mod ? mod->name : "(built-in)"); + cttype->desc.section, get_mod_name(mod)); return -EINVAL; }

@@ -199,6 +206,7 @@ static int codetag_module_init(struct co return 0; }

+#ifdef CONFIG_MODULES void codetag_load_module(struct module *mod) { struct codetag_type *cttype; @@ -248,9 +256,6 @@ bool codetag_unload_module(struct module

return unload_ok; } - -#else /* CONFIG_MODULES */ -static int codetag_module_init(struct codetag_type *cttype, struct module *mod) { return 0; } #endif /* CONFIG_MODULES */

struct codetag_type * _

Patches currently in -mm which might be from surenb@google.com are

alloc_tag-fix-allocation-tag-reporting-when-config_modules=n.patch