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SubjectRe: [PATCH] x86 - Enhance DEBUG_RODATA support - alternatives

[ Cc:-ed Arjan - he wrote and handles the DEBUG_RODATA bits. ]

* Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> wrote:

> Hrm, yeah, that's because http://lkml.org/lkml/2008/2/2/227
>
> x86 - Enhance DEBUG_RODATA support - alternatives
>
> has been pulled out of the x86 tree. It implements the correct
> text_poke required to support this. It's been removed because Xen does
> not support the WP bit in the guest kernels.
>
> Can you try my new replacement implementation ? It creates another
> mapping instead of modifying the WP bit.

thanks, applied it to x86.git.

note, there were rejects and i had to hand-merge it - in general it's
best to send development x86 patches against:

http://people.redhat.com/mingo/x86.git/README

find the merged patch is below - i hope i merged it right ;)

Ingo

------------->
Subject: x86: enhance DEBUG_RODATA support - alternatives
From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date: Thu, 6 Mar 2008 08:48:49 -0500

Fix a memcpy that should be a text_poke (in apply_alternatives).

Use kernel_wp_save/kernel_wp_restore in text_poke to support DEBUG_RODATA
correctly and so the CPU HOTPLUG special case can be removed.

Add text_poke_early, for alternatives and paravirt boot-time and module load
time patching.

Changelog:

- Fix text_set and text_poke alignment check (mixed up bitwise and and or)
- Remove text_set
- Export add_nops, so it can be used by others.
- Document text_poke_early.
- Remove clflush, since it breaks some VIA architectures and is not strictly
necessary.
- Add kerneldoc to text_poke and text_poke_early.
- Create a second vmap instead of using the WP bit to support Xen and VMI.
- Move local_irq disable within text_poke and text_poke_early to be able to
be sleepable in these functions.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: Andi Kleen <andi@firstfloor.org>
CC: pageexec@freemail.hu
CC: H. Peter Anvin <hpa@zytor.com>
CC: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
arch/x86/kernel/alternative.c | 88 +++++++++++++++++++++++++++++++-----------
include/asm-x86/alternative.h | 23 ++++++++++
2 files changed, 87 insertions(+), 24 deletions(-)

Index: linux-x86.q/arch/x86/kernel/alternative.c
===================================================================
--- linux-x86.q.orig/arch/x86/kernel/alternative.c
+++ linux-x86.q/arch/x86/kernel/alternative.c
@@ -11,6 +11,8 @@
#include <asm/mce.h>
#include <asm/nmi.h>
#include <asm/vsyscall.h>
+#include <asm/cacheflush.h>
+#include <asm/io.h>

#define MAX_PATCH_LEN (255-1)

@@ -173,7 +175,7 @@ static const unsigned char*const * find_
#endif /* CONFIG_X86_64 */

/* Use this to add nops to a buffer, then text_poke the whole buffer. */
-static void add_nops(void *insns, unsigned int len)
+void add_nops(void *insns, unsigned int len)
{
const unsigned char *const *noptable = find_nop_table();

@@ -186,6 +188,7 @@ static void add_nops(void *insns, unsign
len -= noplen;
}
}
+EXPORT_SYMBOL_GPL(add_nops);

extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
extern u8 *__smp_locks[], *__smp_locks_end[];
@@ -219,7 +222,7 @@ void apply_alternatives(struct alt_instr
memcpy(insnbuf, a->replacement, a->replacementlen);
add_nops(insnbuf + a->replacementlen,
a->instrlen - a->replacementlen);
- text_poke(instr, insnbuf, a->instrlen);
+ text_poke_early(instr, insnbuf, a->instrlen);
}
}

@@ -280,7 +283,6 @@ void alternatives_smp_module_add(struct
void *text, void *text_end)
{
struct smp_alt_module *smp;
- unsigned long flags;

if (noreplace_smp)
return;
@@ -306,39 +308,37 @@ void alternatives_smp_module_add(struct
__func__, smp->locks, smp->locks_end,
smp->text, smp->text_end, smp->name);

- spin_lock_irqsave(&smp_alt, flags);
+ spin_lock(&smp_alt);
list_add_tail(&smp->next, &smp_alt_modules);
if (boot_cpu_has(X86_FEATURE_UP))
alternatives_smp_unlock(smp->locks, smp->locks_end,
smp->text, smp->text_end);
- spin_unlock_irqrestore(&smp_alt, flags);
+ spin_unlock(&smp_alt);
}

void alternatives_smp_module_del(struct module *mod)
{
struct smp_alt_module *item;
- unsigned long flags;

if (smp_alt_once || noreplace_smp)
return;

- spin_lock_irqsave(&smp_alt, flags);
+ spin_lock(&smp_alt);
list_for_each_entry(item, &smp_alt_modules, next) {
if (mod != item->mod)
continue;
list_del(&item->next);
- spin_unlock_irqrestore(&smp_alt, flags);
+ spin_unlock(&smp_alt);
DPRINTK("%s: %s\n", __func__, item->name);
kfree(item);
return;
}
- spin_unlock_irqrestore(&smp_alt, flags);
+ spin_unlock(&smp_alt);
}

void alternatives_smp_switch(int smp)
{
struct smp_alt_module *mod;
- unsigned long flags;

#ifdef CONFIG_LOCKDEP
/*
@@ -355,7 +355,7 @@ void alternatives_smp_switch(int smp)
return;
BUG_ON(!smp && (num_online_cpus() > 1));

- spin_lock_irqsave(&smp_alt, flags);
+ spin_lock(&smp_alt);

/*
* Avoid unnecessary switches because it forces JIT based VMs to
@@ -379,7 +379,7 @@ void alternatives_smp_switch(int smp)
mod->text, mod->text_end);
}
smp_mode = smp;
- spin_unlock_irqrestore(&smp_alt, flags);
+ spin_unlock(&smp_alt);
}

#endif
@@ -407,7 +407,7 @@ void apply_paravirt(struct paravirt_patc

/* Pad the rest with nops */
add_nops(insnbuf + used, p->len - used);
- text_poke(p->instr, insnbuf, p->len);
+ text_poke_early(p->instr, insnbuf, p->len);
}
}
extern struct paravirt_patch_site __start_parainstructions[],
@@ -416,8 +416,6 @@ extern struct paravirt_patch_site __star

void __init alternative_instructions(void)
{
- unsigned long flags;
-
/* The patching is not fully atomic, so try to avoid local interruptions
that might execute the to be patched code.
Other CPUs are not running. */
@@ -426,7 +424,6 @@ void __init alternative_instructions(voi
stop_mce();
#endif

- local_irq_save(flags);
apply_alternatives(__alt_instructions, __alt_instructions_end);

/* switch to patch-once-at-boottime-only mode and free the
@@ -458,7 +455,6 @@ void __init alternative_instructions(voi
}
#endif
apply_paravirt(__parainstructions, __parainstructions_end);
- local_irq_restore(flags);

if (smp_alt_once)
free_init_pages("SMP alternatives",
@@ -471,18 +467,64 @@ void __init alternative_instructions(voi
#endif
}

-/*
- * Warning:
+/**
+ * text_poke_early - Update instructions on a live kernel at boot time
+ * @addr: address to modify
+ * @opcode: source of the copy
+ * @len: length to copy
+ *
* When you use this code to patch more than one byte of an instruction
* you need to make sure that other CPUs cannot execute this code in parallel.
- * Also no thread must be currently preempted in the middle of these instructions.
- * And on the local CPU you need to be protected again NMI or MCE handlers
- * seeing an inconsistent instruction while you patch.
+ * Also no thread must be currently preempted in the middle of these
+ * instructions. 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 *addr, unsigned char *opcode, int len)
+void *text_poke_early(void *addr, const void *opcode, size_t len)
{
+ unsigned long flags;
+ local_irq_save(flags);
memcpy(addr, opcode, len);
+ local_irq_restore(flags);
+ sync_core();
+ /* Could also do a CLFLUSH here to speed up CPU recovery; but
+ that causes hangs on some VIA CPUs. */
+ return addr;
+}
+
+/**
+ * text_poke - Update instructions on a live kernel
+ * @addr: address to modify
+ * @opcode: source of the copy
+ * @len: length to copy
+ *
+ * Only atomic text poke/set should be allowed when not doing early patching.
+ * It means the size must be writable atomically and the address must be aligned
+ * in a way that permits an atomic write. It also makes sure we fit on a single
+ * page.
+ */
+void *__kprobes text_poke(void *addr, const void *opcode, size_t len)
+{
+ unsigned long flags;
+ char *vaddr;
+ int nr_pages = 2;
+
+ BUG_ON(len > sizeof(long));
+ BUG_ON((((long)addr + len - 1) & ~(sizeof(long) - 1))
+ - ((long)addr & ~(sizeof(long) - 1)));
+ {
+ struct page *pages[2] = { virt_to_page(addr),
+ virt_to_page(addr + PAGE_SIZE) };
+ if (!pages[1])
+ nr_pages = 1;
+ vaddr = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
+ WARN_ON(!vaddr);
+ local_irq_save(flags);
+ memcpy(&vaddr[(unsigned long)addr & ~PAGE_MASK], opcode, len);
+ local_irq_restore(flags);
+ vunmap(vaddr);
+ }
sync_core();
/* Could also do a CLFLUSH here to speed up CPU recovery; but
that causes hangs on some VIA CPUs. */
+ return addr;
}
Index: linux-x86.q/include/asm-x86/alternative.h
===================================================================
--- linux-x86.q.orig/include/asm-x86/alternative.h
+++ linux-x86.q/include/asm-x86/alternative.h
@@ -156,6 +156,27 @@ apply_paravirt(struct paravirt_patch_sit
#define __parainstructions_end NULL
#endif

-extern void text_poke(void *addr, unsigned char *opcode, int len);
+extern void add_nops(void *insns, unsigned int len);
+
+/*
+ * Clear and restore the kernel write-protection flag on the local CPU.
+ * Allows the kernel to edit read-only pages.
+ * Side-effect: any interrupt handler running between save and restore will have
+ * the ability to write to read-only pages.
+ *
+ * Warning:
+ * Code patching in the UP case is safe if NMIs and MCE handlers are stopped and
+ * no thread can be preempted in the instructions being modified (no iret to an
+ * invalid instruction possible) or if the instructions are changed from a
+ * consistent state to another consistent state atomically.
+ * More care must be taken when modifying code in the SMP case because of
+ * Intel's errata.
+ * On the local CPU you need to be protected again NMI or MCE handlers seeing an
+ * inconsistent instruction while you patch.
+ * The _early version expects the memory to already be RW.
+ */
+
+extern void *text_poke(void *addr, const void *opcode, size_t len);
+extern void *text_poke_early(void *addr, const void *opcode, size_t len);

#endif /* _ASM_X86_ALTERNATIVE_H */

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