From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Anton Arapov <anton@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>,
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: Re: [PATCH v1 4/9] uretprobes/ppc: Hijack return address
Date: Sun, 7 Apr 2013 17:21:14 +0530 [thread overview]
Message-ID: <20130407115114.GD2186@linux.vnet.ibm.com> (raw)
In-Reply-To: <1365004839-21982-5-git-send-email-anton@redhat.com>
* Anton Arapov <anton@redhat.com> [2013-04-03 18:00:34]:
> Hijack the return address and replace it with a trampoline address.
> PowerPC implementation.
>
> Signed-off-by: Anton Arapov <anton@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.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
>
--
Thanks and Regards
Srikar Dronamraju
next prev parent reply other threads:[~2013-04-07 11:57 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 ` [PATCH v1 4/9] uretprobes/ppc: " Anton Arapov
2013-04-04 3:31 ` Ananth N Mavinakayanahalli
2013-04-07 11:51 ` Srikar Dronamraju [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130407115114.GD2186@linux.vnet.ibm.com \
--to=srikar@linux.vnet.ibm.com \
--cc=Torsten.Polle@gmx.de \
--cc=adrian.m.negreanu@intel.com \
--cc=ananth@in.ibm.com \
--cc=anton@redhat.com \
--cc=fche@redhat.com \
--cc=jistone@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=oleg@redhat.com \
--cc=peterz@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).