aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--arch/i386/kernel/alternative.c14
-rw-r--r--arch/i386/mm/init.c14
-rw-r--r--arch/x86_64/mm/init.c10
3 files changed, 23 insertions, 15 deletions
diff --git a/arch/i386/kernel/alternative.c b/arch/i386/kernel/alternative.c
index c3750c2c411..c85598acb8f 100644
--- a/arch/i386/kernel/alternative.c
+++ b/arch/i386/kernel/alternative.c
@@ -430,22 +430,12 @@ void __init alternative_instructions(void)
* And on the local CPU you need to be protected again NMI or MCE handlers
* seeing an inconsistent instruction while you patch.
*/
-void __kprobes text_poke(void *oaddr, unsigned char *opcode, int len)
+void __kprobes text_poke(void *addr, unsigned char *opcode, int len)
{
- u8 *addr = oaddr;
- if (!pte_write(*lookup_address((unsigned long)addr))) {
- struct page *p[2] = { virt_to_page(addr), virt_to_page(addr+PAGE_SIZE) };
- addr = vmap(p, 2, VM_MAP, PAGE_KERNEL);
- if (!addr)
- return;
- addr += ((unsigned long)oaddr) % PAGE_SIZE;
- }
memcpy(addr, opcode, len);
sync_core();
/* Not strictly needed, but can speed CPU recovery up. Ignore cross cacheline
case. */
if (cpu_has_clflush)
- asm("clflush (%0) " :: "r" (oaddr) : "memory");
- if (addr != oaddr)
- vunmap(addr);
+ asm("clflush (%0) " :: "r" (addr) : "memory");
}
diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c
index 1b1a1e66d09..4c4809f13cb 100644
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -800,9 +800,17 @@ void mark_rodata_ro(void)
unsigned long start = PFN_ALIGN(_text);
unsigned long size = PFN_ALIGN(_etext) - start;
- change_page_attr(virt_to_page(start),
- size >> PAGE_SHIFT, PAGE_KERNEL_RX);
- printk("Write protecting the kernel text: %luk\n", size >> 10);
+#ifndef CONFIG_KPROBES
+#ifdef CONFIG_HOTPLUG_CPU
+ /* It must still be possible to apply SMP alternatives. */
+ if (num_possible_cpus() <= 1)
+#endif
+ {
+ change_page_attr(virt_to_page(start),
+ size >> PAGE_SHIFT, PAGE_KERNEL_RX);
+ printk("Write protecting the kernel text: %luk\n", size >> 10);
+ }
+#endif
start += size;
size = (unsigned long)__end_rodata - start;
change_page_attr(virt_to_page(start),
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index 38f5d636800..458893b376f 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -600,6 +600,16 @@ void mark_rodata_ro(void)
{
unsigned long start = (unsigned long)_stext, end;
+#ifdef CONFIG_HOTPLUG_CPU
+ /* It must still be possible to apply SMP alternatives. */
+ if (num_possible_cpus() > 1)
+ start = (unsigned long)_etext;
+#endif
+
+#ifdef CONFIG_KPROBES
+ start = (unsigned long)__start_rodata;
+#endif
+
end = (unsigned long)__end_rodata;
start = (start + PAGE_SIZE - 1) & PAGE_MASK;
end &= PAGE_MASK;