x86/kprobes: Verify stack frame on kretprobe

Verify the stack frame pointer on kretprobe trampoline handler,
If the stack frame pointer does not match, it skips the wrong
entry and tries to find correct one.

This can happen if user puts the kretprobe on the function
which can be used in the path of ftrace user-function call.
Such functions should not be probed, so this adds a warning
message that reports which function should be blacklisted.

Tested-by: Andrea Righi <righi.andrea@gmail.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/155094059185.6137.15527904013362842072.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
index a034cb808e7eb482e6fd8eae3fac9afca63b429c..18fbe9be2d683d2fb0d028aaf178e3f638fa4a0d 100644 (file)
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -569,6 +569,7 @@ void arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs)
        unsigned long *sara = stack_addr(regs);
 
        ri->ret_addr = (kprobe_opcode_t *) *sara;
+       ri->fp = sara;
 
        /* Replace the return addr with trampoline addr */
        *sara = (unsigned long) &kretprobe_trampoline;
@@ -759,15 +760,21 @@ static __used void *trampoline_handler(struct pt_regs *regs)
        unsigned long flags, orig_ret_address = 0;
        unsigned long trampoline_address = (unsigned long)&kretprobe_trampoline;
        kprobe_opcode_t *correct_ret_addr = NULL;
+       void *frame_pointer;
+       bool skipped = false;
 
        INIT_HLIST_HEAD(&empty_rp);
        kretprobe_hash_lock(current, &head, &flags);
        /* fixup registers */
 #ifdef CONFIG_X86_64
        regs->cs = __KERNEL_CS;
+       /* On x86-64, we use pt_regs->sp for return address holder. */
+       frame_pointer = &regs->sp;
 #else
        regs->cs = __KERNEL_CS | get_kernel_rpl();
        regs->gs = 0;
+       /* On x86-32, we use pt_regs->flags for return address holder. */
+       frame_pointer = &regs->flags;
 #endif
        regs->ip = trampoline_address;
        regs->orig_ax = ~0UL;
@@ -789,8 +796,25 @@ static __used void *trampoline_handler(struct pt_regs *regs)
                if (ri->task != current)
                        /* another task is sharing our hash bucket */
                        continue;
+               /*
+                * Return probes must be pushed on this hash list correct
+                * order (same as return order) so that it can be poped
+                * correctly. However, if we find it is pushed it incorrect
+                * order, this means we find a function which should not be
+                * probed, because the wrong order entry is pushed on the
+                * path of processing other kretprobe itself.
+                */
+               if (ri->fp != frame_pointer) {
+                       if (!skipped)
+                               pr_warn("kretprobe is stacked incorrectly. Trying to fixup.\n");
+                       skipped = true;
+                       continue;
+               }
 
                orig_ret_address = (unsigned long)ri->ret_addr;
+               if (skipped)
+                       pr_warn("%ps must be blacklisted because of incorrect kretprobe order\n",
+                               ri->rp->kp.addr);
 
                if (orig_ret_address != trampoline_address)
                        /*
@@ -808,6 +832,8 @@ static __used void *trampoline_handler(struct pt_regs *regs)
                if (ri->task != current)
                        /* another task is sharing our hash bucket */
                        continue;
+               if (ri->fp != frame_pointer)
+                       continue;
 
                orig_ret_address = (unsigned long)ri->ret_addr;
                if (ri->rp && ri->rp->handler) {

diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 201f0f2683f25bd382267042f9f7dbec8460f093..9a897256e481f311a1de41e448c52710d2c2f247 100644 (file)
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -173,6 +173,7 @@ struct kretprobe_instance {
        struct kretprobe *rp;
        kprobe_opcode_t *ret_addr;
        struct task_struct *task;
+       void *fp;
        char data[0];
 };