linux-kernel - [PATCH 08/11] perf intel-pt: Allow for a guest kernel address filter

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 18 Feb 2021 11:57:58 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 08/11] perf intel-pt: Allow for a guest kernel address filter

Handling TIP.PGD for an address filter for a guest kernel is the same as a
host kernel, but user space decoding, and hence address filters, are not
supported.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/intel-pt.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 29d871718995..546d512b300a 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -792,8 +792,14 @@ static int __intel_pt_pgd_ip(uint64_t ip, void *data)
 	u8 cpumode;
 	u64 offset;
 
-	if (ip >= ptq->pt->kernel_start)
+	if (ptq->state->to_nr) {
+		if (intel_pt_guest_kernel_ip(ip))
+			return intel_pt_match_pgd_ip(ptq->pt, ip, ip, NULL);
+		/* No support for decoding guest user space */
+		return -EINVAL;
+	} else if (ip >= ptq->pt->kernel_start) {
 		return intel_pt_match_pgd_ip(ptq->pt, ip, ip, NULL);
+	}
 
 	cpumode = PERF_RECORD_MISC_USER;
 
-- 
2.17.1