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x86/modules: Set VM_FLUSH_RESET_PERMS in module_alloc()

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Instead of resetting permissions all over the place when freeing module
memory tell the vmalloc code to do so. Avoids the exercise for the next
upcoming user.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111143.406703869@infradead.org
This commit is contained in:
Thomas Gleixner 2022-09-15 13:10:44 +02:00 committed by Peter Zijlstra
parent 2cb15faaed
commit 4c4eb3ecc9
3 changed files with 5 additions and 7 deletions
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2
arch/x86/kernel/ftrace.c
View File

@ -413,8 +413,6 @@ create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)
/* ALLOC_TRAMP flags lets us know we created it */
ops->flags |= FTRACE_OPS_FL_ALLOC_TRAMP;
set_vm_flush_reset_perms(trampoline);
if (likely(system_state != SYSTEM_BOOTING))
set_memory_ro((unsigned long)trampoline, npages);
set_memory_x((unsigned long)trampoline, npages);

1
arch/x86/kernel/kprobes/core.c
View File

@ -414,7 +414,6 @@ void *alloc_insn_page(void)
if (!page)
return NULL;
set_vm_flush_reset_perms(page);
/*
* First make the page read-only, and only then make it executable to
* prevent it from being W+X in between.

9
arch/x86/kernel/module.c
View File

@ -74,10 +74,11 @@ void *module_alloc(unsigned long size)
return NULL;
p = __vmalloc_node_range(size, MODULE_ALIGN,
MODULES_VADDR + get_module_load_offset(),
MODULES_END, gfp_mask,
PAGE_KERNEL, VM_DEFER_KMEMLEAK, NUMA_NO_NODE,
__builtin_return_address(0));
MODULES_VADDR + get_module_load_offset(),
MODULES_END, gfp_mask, PAGE_KERNEL,
VM_FLUSH_RESET_PERMS | VM_DEFER_KMEMLEAK,
NUMA_NO_NODE, __builtin_return_address(0));
if (p && (kasan_alloc_module_shadow(p, size, gfp_mask) < 0)) {
vfree(p);
return NULL;