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Date: Sun, 11 Jul 2021 16:35:09 +0900
From: Masami Hiramatsu <mhiramat@...nel.org>
To: X86 ML <x86@...nel.org>, Ingo Molnar <mingo@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
bpf@...r.kernel.org, kuba@...nel.org, mingo@...hat.com,
ast@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
Borislav Petkov <bp@...en8.de>,
Peter Zijlstra <peterz@...radead.org>, kernel-team@...com,
yhs@...com, linux-ia64@...r.kernel.org,
Abhishek Sagar <sagar.abhishek@...il.com>,
Andrii Nakryiko <andrii.nakryiko@...il.com>,
Joe Perches <joe@...ches.com>
Subject: [PATCH -tip v2 5/6] kprobes: treewide: Use 'kprobe_opcode_t *' for the code address in get_optimized_kprobe()
Since get_optimized_kprobe() is only used inside kprobes,
it doesn't need to use 'unsigned long' type for 'addr' parameter.
Make it use 'kprobe_opcode_t *' for the 'addr' parameter and
subsequent call of arch_within_optimized_kprobe() also should use
'kprobe_opcode_t *'.
Note that MAX_OPTIMIZED_LENGTH and RELATIVEJUMP_SIZE are defined
by byte-size, but the size of 'kprobe_opcode_t' depends on the
architecture. Therefore, we must be careful when calculating
addresses using those macros.
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
arch/arm/probes/kprobes/opt-arm.c | 7 ++++---
arch/powerpc/kernel/optprobes.c | 6 +++---
arch/x86/kernel/kprobes/opt.c | 6 +++---
include/linux/kprobes.h | 2 +-
kernel/kprobes.c | 10 +++++-----
5 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/arch/arm/probes/kprobes/opt-arm.c b/arch/arm/probes/kprobes/opt-arm.c
index c78180172120..dbef34ed933f 100644
--- a/arch/arm/probes/kprobes/opt-arm.c
+++ b/arch/arm/probes/kprobes/opt-arm.c
@@ -347,10 +347,11 @@ void arch_unoptimize_kprobes(struct list_head *oplist,
}
int arch_within_optimized_kprobe(struct optimized_kprobe *op,
- unsigned long addr)
+ kprobe_opcode_t *addr)
{
- return ((unsigned long)op->kp.addr <= addr &&
- (unsigned long)op->kp.addr + RELATIVEJUMP_SIZE > addr);
+ return (op->kp.addr <= addr &&
+ op->kp.addr + (RELATIVEJUMP_SIZE / sizeof(kprobe_opcode_t)) > addr);
+
}
void arch_remove_optimized_kprobe(struct optimized_kprobe *op)
diff --git a/arch/powerpc/kernel/optprobes.c b/arch/powerpc/kernel/optprobes.c
index c79899abcec8..325ba544883c 100644
--- a/arch/powerpc/kernel/optprobes.c
+++ b/arch/powerpc/kernel/optprobes.c
@@ -301,8 +301,8 @@ void arch_unoptimize_kprobes(struct list_head *oplist, struct list_head *done_li
}
}
-int arch_within_optimized_kprobe(struct optimized_kprobe *op, unsigned long addr)
+int arch_within_optimized_kprobe(struct optimized_kprobe *op, kprobe_opcode_t *addr)
{
- return ((unsigned long)op->kp.addr <= addr &&
- (unsigned long)op->kp.addr + RELATIVEJUMP_SIZE > addr);
+ return (op->kp.addr <= addr &&
+ op->kp.addr + (RELATIVEJUMP_SIZE / sizeof(kprobe_opcode_t)) > addr);
}
diff --git a/arch/x86/kernel/kprobes/opt.c b/arch/x86/kernel/kprobes/opt.c
index 71425ebba98a..b4a54a52aa59 100644
--- a/arch/x86/kernel/kprobes/opt.c
+++ b/arch/x86/kernel/kprobes/opt.c
@@ -367,10 +367,10 @@ int arch_check_optimized_kprobe(struct optimized_kprobe *op)
/* Check the addr is within the optimized instructions. */
int arch_within_optimized_kprobe(struct optimized_kprobe *op,
- unsigned long addr)
+ kprobe_opcode_t *addr)
{
- return ((unsigned long)op->kp.addr <= addr &&
- (unsigned long)op->kp.addr + op->optinsn.size > addr);
+ return (op->kp.addr <= addr &&
+ op->kp.addr + op->optinsn.size > addr);
}
/* Free optimized instruction slot */
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 3d02917c837b..bb6d1e72a943 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -329,7 +329,7 @@ extern void arch_unoptimize_kprobes(struct list_head *oplist,
struct list_head *done_list);
extern void arch_unoptimize_kprobe(struct optimized_kprobe *op);
extern int arch_within_optimized_kprobe(struct optimized_kprobe *op,
- unsigned long addr);
+ kprobe_opcode_t *addr);
extern void opt_pre_handler(struct kprobe *p, struct pt_regs *regs);
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index a99fd840b5c9..e30c639fe2cc 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -485,15 +485,15 @@ static int kprobe_queued(struct kprobe *p)
* Return an optimized kprobe whose optimizing code replaces
* instructions including 'addr' (exclude breakpoint).
*/
-static struct kprobe *get_optimized_kprobe(unsigned long addr)
+static struct kprobe *get_optimized_kprobe(kprobe_opcode_t *addr)
{
int i;
struct kprobe *p = NULL;
struct optimized_kprobe *op;
/* Don't check i == 0, since that is a breakpoint case. */
- for (i = 1; !p && i < MAX_OPTIMIZED_LENGTH; i++)
- p = get_kprobe((void *)(addr - i));
+ for (i = 1; !p && i < MAX_OPTIMIZED_LENGTH / sizeof(kprobe_opcode_t); i++)
+ p = get_kprobe(addr - i);
if (p && kprobe_optready(p)) {
op = container_of(p, struct optimized_kprobe, kp);
@@ -967,7 +967,7 @@ static void __arm_kprobe(struct kprobe *p)
lockdep_assert_held(&text_mutex);
/* Find the overlapping optimized kprobes. */
- _p = get_optimized_kprobe((unsigned long)p->addr);
+ _p = get_optimized_kprobe(p->addr);
if (unlikely(_p))
/* Fallback to unoptimized kprobe */
unoptimize_kprobe(_p, true);
@@ -989,7 +989,7 @@ static void __disarm_kprobe(struct kprobe *p, bool reopt)
if (!kprobe_queued(p)) {
arch_disarm_kprobe(p);
/* If another kprobe was blocked, re-optimize it. */
- _p = get_optimized_kprobe((unsigned long)p->addr);
+ _p = get_optimized_kprobe(p->addr);
if (unlikely(_p) && reopt)
optimize_kprobe(_p);
}
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