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x86: harden kernel code patching 

Signed-off-by: Ingo Molnar <mingo@elte.hu>
hifive-unleashed-5.1
Ingo Molnar 2008-04-25 17:07:03 +02:00
parent b7b66baa8b
commit 00c6b2d5d7
1 changed files with 1 additions and 0 deletions
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arch/x86/kernel/alternative.c
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@ -519,6 +519,7 @@ void *__kprobes text_poke(void *addr, const void *opcode, size_t len)
pages[1] = vmalloc_to_page(addr + PAGE_SIZE);
} else {
pages[0] = virt_to_page(addr);
WARN_ON(!PageReserved(pages[0]));
pages[1] = virt_to_page(addr + PAGE_SIZE);
}
BUG_ON(!pages[0]);