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From: Anton Arapov <anton@redhat.com>
To: Anton Arapov <anton@redhat.com>, Oleg Nesterov <oleg@redhat.com>,
	Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Josh Stone <jistone@redhat.com>, Frank Eigler <fche@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@elte.hu>,
	Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
	adrian.m.negreanu@intel.com, Torsten.Polle@gmx.de
Subject: [PATCH v1 4/9] uretprobes/ppc: Hijack return address
Date: Wed,  3 Apr 2013 18:00:34 +0200	[thread overview]
Message-ID: <1365004839-21982-5-git-send-email-anton@redhat.com> (raw)
In-Reply-To: <1365004839-21982-1-git-send-email-anton@redhat.com>

Hijack the return address and replace it with a trampoline address.
PowerPC implementation.

Signed-off-by: Anton Arapov <anton@redhat.com>
---
 arch/powerpc/include/asm/uprobes.h |  1 +
 arch/powerpc/kernel/uprobes.c      | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/arch/powerpc/include/asm/uprobes.h b/arch/powerpc/include/asm/uprobes.h
index b532060..2301602 100644
--- a/arch/powerpc/include/asm/uprobes.h
+++ b/arch/powerpc/include/asm/uprobes.h
@@ -51,4 +51,5 @@ extern int  arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
 extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
 extern int  arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
 extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
+extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs);
 #endif	/* _ASM_UPROBES_H */
diff --git a/arch/powerpc/kernel/uprobes.c b/arch/powerpc/kernel/uprobes.c
index bc77834..567b975 100644
--- a/arch/powerpc/kernel/uprobes.c
+++ b/arch/powerpc/kernel/uprobes.c
@@ -188,3 +188,16 @@ bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
 
 	return false;
 }
+
+unsigned long
+arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs)
+{
+	unsigned long orig_ret_vaddr;
+
+	orig_ret_vaddr = regs->link;
+
+	/* Replace the return addr with trampoline addr */
+	regs->link = trampoline_vaddr;
+
+	return orig_ret_vaddr;
+}
-- 
1.8.1.4


  parent reply	other threads:[~2013-04-03 16:01 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-04-03 16:00 [PATCH v1 0/9] uretprobes: Return uprobes implementation Anton Arapov
2013-04-03 16:00 ` [PATCH v1 1/9] uretprobes: Introduce uprobe_consumer->ret_handler() Anton Arapov
2013-04-07 11:37   ` Srikar Dronamraju
2013-04-03 16:00 ` [PATCH v1 2/9] uretprobes: Reserve the first slot in xol_vma for trampoline Anton Arapov
2013-04-07 11:44   ` Srikar Dronamraju
2013-04-09 14:16     ` Oleg Nesterov
2013-04-03 16:00 ` [PATCH v1 3/9] uretprobes/x86: Hijack return address Anton Arapov
2013-04-07 11:48   ` Srikar Dronamraju
2013-04-03 16:00 ` Anton Arapov [this message]
2013-04-04  3:31   ` [PATCH v1 4/9] uretprobes/ppc: " Ananth N Mavinakayanahalli
2013-04-07 11:51   ` Srikar Dronamraju
2013-04-03 16:00 ` [PATCH v1 5/9] uretprobes: Return probe entry, prepare_uretprobe() Anton Arapov
2013-04-07 11:52   ` Srikar Dronamraju
2013-04-03 16:00 ` [PATCH v1 6/9] uretprobes: Return probe exit, invoke handlers Anton Arapov
2013-04-07 10:53   ` Srikar Dronamraju
2013-04-09 14:05     ` Oleg Nesterov
2013-04-09 20:13       ` Oleg Nesterov
2013-04-13 10:01         ` Srikar Dronamraju
2013-04-13 16:10           ` Oleg Nesterov
2013-04-03 16:00 ` [PATCH v1 7/9] uretprobes: Limit the depth of return probe nestedness Anton Arapov
2013-04-07 11:55   ` Srikar Dronamraju
2013-04-03 16:00 ` [PATCH v1 8/9] uretprobes: Remove -ENOSYS as return probes implemented Anton Arapov
2013-04-07 11:56   ` Srikar Dronamraju
2013-04-03 16:00 ` [PATCH v1 9/9] uretprobes: Documentation update Anton Arapov
2013-04-07 11:57   ` Srikar Dronamraju
2013-04-03 17:45 ` [PATCH v1 0/9] uretprobes: Return uprobes implementation Oleg Nesterov
2013-04-04  3:32   ` Ananth N Mavinakayanahalli

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