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]
Message-ID: <20230612093540.253514702@infradead.org>
Date:   Mon, 12 Jun 2023 11:07:51 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     torvalds@...ux-foundation.org, keescook@...omium.org,
        gregkh@...uxfoundation.org, pbonzini@...hat.com
Cc:     masahiroy@...nel.org, nathan@...nel.org, ndesaulniers@...gle.com,
        nicolas@...sle.eu, catalin.marinas@....com, will@...nel.org,
        vkoul@...nel.org, trix@...hat.com, ojeda@...nel.org,
        peterz@...radead.org, mingo@...hat.com, longman@...hat.com,
        boqun.feng@...il.com, dennis@...nel.org, tj@...nel.org,
        cl@...ux.com, acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org, irogers@...gle.com, adrian.hunter@...el.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        paulmck@...nel.org, frederic@...nel.org, quic_neeraju@...cinc.com,
        joel@...lfernandes.org, josh@...htriplett.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        rientjes@...gle.com, vbabka@...e.cz, roman.gushchin@...ux.dev,
        42.hyeyoo@...il.com, apw@...onical.com, joe@...ches.com,
        dwaipayanray1@...il.com, lukas.bulwahn@...il.com,
        john.johansen@...onical.com, paul@...l-moore.com,
        jmorris@...ei.org, serge@...lyn.com, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        llvm@...ts.linux.dev, linux-perf-users@...r.kernel.org,
        rcu@...r.kernel.org, linux-security-module@...r.kernel.org,
        tglx@...utronix.de, ravi.bangoria@....com, error27@...il.com,
        luc.vanoostenryck@...il.com
Subject: [PATCH v3 38/57] perf: Simplify IOC_SET_OUTPUT


Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/events/core.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5762,6 +5762,11 @@ static inline struct fd perf_fdget(int f
 	return f;
 }
 
+static inline bool is_perf_fd(struct fd fd)
+{
+	return fd.file && fd.file->f_op == &perf_fops;
+}
+
 static int perf_event_set_output(struct perf_event *event,
 				 struct perf_event *output_event);
 static int perf_event_set_filter(struct perf_event *event, void __user *arg);
@@ -5807,19 +5812,15 @@ static long _perf_ioctl(struct perf_even
 
 	case PERF_EVENT_IOC_SET_OUTPUT:
 	{
-		int ret;
 		if (arg != -1) {
 			struct perf_event *output_event;
-			struct fd output = perf_fdget(arg);
-			if (!output.file)
+			CLASS(fd, output)(arg);
+			if (!is_perf_fd(output))
 				return -EBADF;
 			output_event = output.file->private_data;
-			ret = perf_event_set_output(event, output_event);
-			fdput(output);
-		} else {
-			ret = perf_event_set_output(event, NULL);
+			return perf_event_set_output(event, output_event);
 		}
-		return ret;
+		return perf_event_set_output(event, NULL);
 	}
 
 	case PERF_EVENT_IOC_SET_FILTER:


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ