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module: Make .static_call_sites read-only after init

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Section .static_call_sites holds data structures that need to be sorted and
processed only at module load time. This initial processing happens in
static_call_add_module(), which is invoked as a callback to the
MODULE_STATE_COMING notification from prepare_coming_module().

The section is never modified afterwards. Make it therefore read-only after
module initialization to avoid any (non-)accidental modifications.

Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20250306131430.7016-4-petr.pavlu@suse.com
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
This commit is contained in:
Petr Pavlu
2025-03-06 14:13:54 +01:00
parent f798494263
commit 60b57b9cb0
1 changed files with 9 additions and 0 deletions
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9
kernel/module/strict_rwx.c
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@@ -121,6 +121,15 @@ static const char *const ro_after_init[] = {
* section, which are marked as such at module load time.
*/
"__jump_table",
#ifdef CONFIG_HAVE_STATIC_CALL_INLINE
/*
* Section .static_call_sites holds data structures that need to be
* sorted and processed at module load time but are never modified
* afterwards.
*/
".static_call_sites",
#endif
};
void module_mark_ro_after_init(const Elf_Ehdr *hdr, Elf_Shdr *sechdrs,