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Mon, 17 Feb 2025 09:50:12 +0000 Received: from DM4PR12MB8558.namprd12.prod.outlook.com ([fe80::5ce:264f:c63c:2703]) by DM4PR12MB8558.namprd12.prod.outlook.com ([fe80::5ce:264f:c63c:2703%5]) with mapi id 15.20.8445.017; Mon, 17 Feb 2025 09:50:12 +0000 From: Wojtek Wasko To: netdev@vger.kernel.org Cc: richardcochran@gmail.com, vadim.fedorenko@linux.dev, kuba@kernel.org, horms@kernel.org, anna-maria@linutronix.de, frederic@kernel.org, pabeni@redhat.com, tglx@linutronix.de Subject: [PATCH net-next v3 1/3] posix-clock: Store file pointer in struct posix_clock_context Date: Mon, 17 Feb 2025 11:50:03 +0200 Message-ID: <20250217095005.1453413-2-wwasko@nvidia.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250217095005.1453413-1-wwasko@nvidia.com> References: <20250217095005.1453413-1-wwasko@nvidia.com> X-ClientProxiedBy: LO4P123CA0452.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:1aa::7) To DM4PR12MB8558.namprd12.prod.outlook.com (2603:10b6:8:187::22) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR12MB8558:EE_|SA1PR12MB7443:EE_ X-MS-Office365-Filtering-Correlation-Id: 110d838c-3249-4806-12da-08dd4f387907 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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Character device operations (open, read, poll, ioctl) do not implement a generic permission control and the dynamic clock callbacks have no access to the file pointer to implement them. Extend struct posix_clock_context with a struct file pointer and initialize it in posix_clock_open(), so that all dynamic clock callbacks can access it. Signed-off-by: Wojtek Wasko Reviewed-by: Thomas Gleixner --- include/linux/posix-clock.h | 6 +++++- kernel/time/posix-clock.c | 1 + 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/include/linux/posix-clock.h b/include/linux/posix-clock.h index ef8619f48920..40fa204baafc 100644 --- a/include/linux/posix-clock.h +++ b/include/linux/posix-clock.h @@ -95,10 +95,13 @@ struct posix_clock { * struct posix_clock_context - represents clock file operations context * * @clk: Pointer to the clock + * @fp: Pointer to the file used to open the clock * @private_clkdata: Pointer to user data * * Drivers should use struct posix_clock_context during specific character - * device file operation methods to access the posix clock. + * device file operation methods to access the posix clock. In particular, + * the file pointer can be used to verify correct access mode for ioctl() + * calls. * * Drivers can store a private data structure during the open operation * if they have specific information that is required in other file @@ -106,6 +109,7 @@ struct posix_clock { */ struct posix_clock_context { struct posix_clock *clk; + struct file *fp; void *private_clkdata; }; diff --git a/kernel/time/posix-clock.c b/kernel/time/posix-clock.c index 1af0bb2cc45c..4e114e34a6e0 100644 --- a/kernel/time/posix-clock.c +++ b/kernel/time/posix-clock.c @@ -129,6 +129,7 @@ static int posix_clock_open(struct inode *inode, struct file *fp) goto out; } pccontext->clk = clk; + pccontext->fp = fp; if (clk->ops.open) { err = clk->ops.open(pccontext, fp->f_mode); if (err) { From patchwork Mon Feb 17 09:50:04 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Wojtek Wasko X-Patchwork-Id: 13977395 X-Patchwork-Delegate: kuba@kernel.org Received: from NAM12-MW2-obe.outbound.protection.outlook.com (mail-mw2nam12on2046.outbound.protection.outlook.com [40.107.244.46]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5C463215F76 for ; 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Userspace applications rely on these clocks to timestamp events, trace workload execution, correlate timescales across devices, and keep various clocks in sync. The kernel’s current implementation of PTP clocks does not enforce file permissions checks for most device operations except for POSIX clock operations, where file mode is verified in the POSIX layer before forwarding the call to the PTP subsystem. Consequently, it is common practice to not give unprivileged userspace applications any access to PTP clocks whatsoever by giving the PTP chardevs 600 permissions. An example of users running into this limitation is documented in [1]. Add permission checks for functions that modify the state of a PTP device. Continue enforcing permission checks for POSIX clock operations (settime, adjtime) in the POSIX layer. One limitation remains: querying the adjusted frequency of a PTP device (using adjtime() with an empty modes field) is not supported for chardevs opened without WRITE permissions, as the POSIX layer mandates WRITE access for any adjtime operation. [1] https://lists.nwtime.org/sympa/arc/linuxptp-users/2024-01/msg00036.html Signed-off-by: Wojtek Wasko --- drivers/ptp/ptp_chardev.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c index bf6468c56419..4380e6ddb849 100644 --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -205,6 +205,10 @@ long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd, case PTP_EXTTS_REQUEST: case PTP_EXTTS_REQUEST2: + if ((pccontext->fp->f_mode & FMODE_WRITE) == 0) { + err = -EACCES; + break; + } memset(&req, 0, sizeof(req)); if (copy_from_user(&req.extts, (void __user *)arg, @@ -246,6 +250,10 @@ long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd, case PTP_PEROUT_REQUEST: case PTP_PEROUT_REQUEST2: + if ((pccontext->fp->f_mode & FMODE_WRITE) == 0) { + err = -EACCES; + break; + } memset(&req, 0, sizeof(req)); if (copy_from_user(&req.perout, (void __user *)arg, @@ -314,6 +322,10 @@ long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd, case PTP_ENABLE_PPS: case PTP_ENABLE_PPS2: + if ((pccontext->fp->f_mode & FMODE_WRITE) == 0) { + err = -EACCES; 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Add '-r' option to testptp to open the PHC in readonly mode instead of the default read-write mode. Skip enabling EXTTS if readonly mode is requested. Signed-off-by: Wojtek Wasko --- tools/testing/selftests/ptp/testptp.c | 37 +++++++++++++++++---------- 1 file changed, 23 insertions(+), 14 deletions(-) diff --git a/tools/testing/selftests/ptp/testptp.c b/tools/testing/selftests/ptp/testptp.c index 58064151f2c8..edc08a4433fd 100644 --- a/tools/testing/selftests/ptp/testptp.c +++ b/tools/testing/selftests/ptp/testptp.c @@ -140,6 +140,7 @@ static void usage(char *progname) " -H val set output phase to 'val' nanoseconds (requires -p)\n" " -w val set output pulse width to 'val' nanoseconds (requires -p)\n" " -P val enable or disable (val=1|0) the system clock PPS\n" + " -r open the ptp clock in readonly mode\n" " -s set the ptp clock time from the system time\n" " -S set the system time from the ptp clock time\n" " -t val shift the ptp clock time by 'val' seconds\n" @@ -188,6 +189,7 @@ int main(int argc, char *argv[]) int pin_index = -1, pin_func; int pps = -1; int seconds = 0; + int readonly = 0; int settime = 0; int channel = -1; clockid_t ext_clockid = CLOCK_REALTIME; @@ -200,7 +202,7 @@ int main(int argc, char *argv[]) progname = strrchr(argv[0], '/'); progname = progname ? 1+progname : argv[0]; - while (EOF != (c = getopt(argc, argv, "cd:e:f:F:ghH:i:k:lL:n:o:p:P:sSt:T:w:x:Xy:z"))) { + while (EOF != (c = getopt(argc, argv, "cd:e:f:F:ghH:i:k:lL:n:o:p:P:rsSt:T:w:x:Xy:z"))) { switch (c) { case 'c': capabilities = 1; @@ -252,6 +254,9 @@ int main(int argc, char *argv[]) case 'P': pps = atoi(optarg); break; + case 'r': + readonly = 1; + break; case 's': settime = 1; break; @@ -308,7 +313,7 @@ int main(int argc, char *argv[]) } } - fd = open(device, O_RDWR); + fd = open(device, readonly ? O_RDONLY : O_RDWR); if (fd < 0) { fprintf(stderr, "opening %s: %s\n", device, strerror(errno)); return -1; @@ -436,14 +441,16 @@ int main(int argc, char *argv[]) } if (extts) { - memset(&extts_request, 0, sizeof(extts_request)); - extts_request.index = index; - extts_request.flags = PTP_ENABLE_FEATURE; - if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) { - perror("PTP_EXTTS_REQUEST"); - extts = 0; - } else { - puts("external time stamp request okay"); + if (!readonly) { + memset(&extts_request, 0, sizeof(extts_request)); + extts_request.index = index; + extts_request.flags = PTP_ENABLE_FEATURE; + if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) { + perror("PTP_EXTTS_REQUEST"); + extts = 0; + } else { + puts("external time stamp request okay"); + } } for (; extts; extts--) { cnt = read(fd, &event, sizeof(event)); @@ -455,10 +462,12 @@ int main(int argc, char *argv[]) event.t.sec, event.t.nsec); fflush(stdout); } - /* Disable the feature again. */ - extts_request.flags = 0; - if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) { - perror("PTP_EXTTS_REQUEST"); + if (!readonly) { + /* Disable the feature again. */ + extts_request.flags = 0; + if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) { + perror("PTP_EXTTS_REQUEST"); + } } }