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module: switch to execmem API for remapping as RW and restoring ROX

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Instead of using writable copy for module text sections, temporarily remap
the memory allocated from execmem's ROX cache as writable and restore its
ROX permissions after the module is formed.

This will allow removing nasty games with writable copy in alternatives
patching on x86.

Signed-off-by: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250126074733.1384926-7-rppt@kernel.org
This commit is contained in:
Mike Rapoport (Microsoft)
2025-01-26 09:47:30 +02:00
committed by Peter Zijlstra
parent 05e555b817
commit c287c07233
4 changed files with 27 additions and 72 deletions
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8
include/linux/module.h
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@@ -367,7 +367,6 @@ enum mod_mem_type {
struct module_memory {
void *base;
void *rw_copy;
bool is_rox;
unsigned int size;
@@ -769,14 +768,9 @@ static inline bool is_livepatch_module(struct module *mod)
void set_module_sig_enforced(void);
void *__module_writable_address(struct module *mod, void *loc);
static inline void *module_writable_address(struct module *mod, void *loc)
{
if (!IS_ENABLED(CONFIG_ARCH_HAS_EXECMEM_ROX) || !mod ||
mod->state != MODULE_STATE_UNFORMED)
return loc;
return __module_writable_address(mod, loc);
return loc;
}
#else /* !CONFIG_MODULES... */