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module: Refine kmemleak scanned areas

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commit ac3b432839 ("module: replace module_layout with module_memory")
introduced a set of memory regions for the module layout sharing the
same attributes. However, it didn't update the kmemleak scanned areas
which intended to limit kmemleak scan to sections containing writable
data. This means sections such as .text and .rodata are scanned by
kmemleak.

Refine the scanned areas for modules by limiting it to MOD_TEXT and
MOD_INIT_TEXT mod_mem regions.

CC: Song Liu <song@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Vincent Donnefort 2024-09-10 08:31:23 +01:00 committed by Luis Chamberlain
parent ce47f7cbbc
commit b319cea805
1 changed files with 4 additions and 14 deletions
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18
kernel/module/debug_kmemleak.c
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@ -12,19 +12,9 @@
void kmemleak_load_module(const struct module *mod,
const struct load_info *info)
{
unsigned int i;
/* only scan the sections containing data */
kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
for (i = 1; i < info->hdr->e_shnum; i++) {
/* Scan all writable sections that's not executable */
if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) ||
!(info->sechdrs[i].sh_flags & SHF_WRITE) ||
(info->sechdrs[i].sh_flags & SHF_EXECINSTR))
continue;
kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
info->sechdrs[i].sh_size, GFP_KERNEL);
/* only scan writable, non-executable sections */
for_each_mod_mem_type(type) {
if (type != MOD_DATA && type != MOD_INIT_DATA)
kmemleak_no_scan(mod->mem[type].base);
}
}