From: Shaohua Li <shaohua.li@intel.com>
To: linux-ia64@vger.kernel.org
Subject: [PATCH]forbid ptrace changes psr.ri to 3
Date: Thu, 16 Aug 2007 06:16:39 +0000 [thread overview]
Message-ID: <1187244999.30462.6.camel@sli10-conroe.sh.intel.com> (raw)
PSR.ri bits 3 are reserved, change to 3 will break kernel.
The patch ignore such change, if you thought access_urea should return
an error in the case, please let me know.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
--- a/arch/ia64/kernel/ptrace.c 2007-08-27 05:48:49.000000000 +0800
+++ b/arch/ia64/kernel/ptrace.c 2007-08-27 05:57:42.000000000 +0800
@@ -951,10 +951,14 @@ access_uarea (struct task_struct *child,
return 0;
case PT_CR_IPSR:
- if (write_access)
- pt->cr_ipsr = ((*data & IPSR_MASK)
+ if (write_access) {
+ unsigned long tmp = *data;
+ /* psr.ri bits 11 are reserved, ingore the change */
+ if ((tmp & IA64_PSR_RI) = IA64_PSR_RI)
+ tmp &= ~IA64_PSR_RI;
+ pt->cr_ipsr = ((tmp & IPSR_MASK)
| (pt->cr_ipsr & ~IPSR_MASK));
- else
+ } else
*data = (pt->cr_ipsr & IPSR_MASK);
return 0;
next reply other threads:[~2007-08-16 6:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-16 6:16 Shaohua Li [this message]
2007-08-17 6:01 ` [PATCH]forbid ptrace changes psr.ri to 3 Roland McGrath
2007-08-17 17:21 ` Luck, Tony
2007-08-17 18:40 ` Bjorn Helgaas
2007-08-17 18:44 ` Luck, Tony
2007-08-17 18:47 ` Bjorn Helgaas
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=1187244999.30462.6.camel@sli10-conroe.sh.intel.com \
--to=shaohua.li@intel.com \
--cc=linux-ia64@vger.kernel.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