From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-183.mta1.migadu.com (out-183.mta1.migadu.com [95.215.58.183]) (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 D0F6B219E4 for ; Sun, 11 May 2025 11:24:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.183 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746962692; cv=none; b=h4G5woaq4TbfstnBHRJXoHRsTBfMCX3KBPiiy7dzMmnbZkWhilN3t0D9xpkHMlyV/YExBLqtMDPXana98455Eg6YCQeyABDIUu9zM26KToiAZg68awddHM1JdsXPGYfNx/PcHOKEZSsgEquOG9wgcELZ5wKcYaMg2V27uwnjQcY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746962692; c=relaxed/simple; bh=lEC9WZ/qdQpjXfHsN/eUAmoL5pcpLsDvn2mY2uiwj2c=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=d/m7cuOkzoYFxcA9reltd7TyAc26xOlulfKfzaKxo2Xo6Q3nR/30yLhj4NAHFaSxrRqlkgGw/ktOEABn6sZuKod0I5r+jGcWyF7bS6HDN7AKUhFEu9hxARCOkciH4xbMucSXHwuTLvVF9EZBlJZJ3nnQBHrH423TGS2pHNk1kgQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=JyZiXLaZ; arc=none smtp.client-ip=95.215.58.183 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="JyZiXLaZ" Message-ID: <72623145-1170-4aa1-91d6-95ff04166471@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1746962677; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ZkQoOYhb4p995v2BTxXrFRQBwVVYevEP1vWidNRM6LA=; b=JyZiXLaZ403cC3tKKP9u9w1aENzsvRxl7bqimR/omFHtLE7JrOiTWLtBiEJdLwTE4JQrGE nFQ0OoGtpF5mVn/UR9wKfwuqqAkL3kWVDetYVSUqN+FBlExxZBk/zEsH1ghV9rn4jbWv9Y D4Lq0jH1UUv81NvPXaSKOZx7HXS0r4w= Date: Sun, 11 May 2025 12:24:33 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [PATCH v3 1/1] ptp: ocp: Limit signal/freq counts in show/store functions To: Sagi Maimon , jonathan.lemon@gmail.com, richardcochran@gmail.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org References: <20250511085214.76806-1-maimon.sagi@gmail.com> Content-Language: en-US X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Vadim Fedorenko In-Reply-To: <20250511085214.76806-1-maimon.sagi@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT On 11/05/2025 09:52, Sagi Maimon wrote: > The sysfs show/store operations could access uninitialized elements > in the freq_in[] and signal_out[] arrays, leading to NULL pointer > dereferences. This patch introduces u8 fields (nr_freq_in, > nr_signal_out) to track the number of initialized elements, capping > the maximum at 4 for each array. The show/store functions are updated > to respect these limits, preventing out-of-bounds access and ensuring > safe array handling. > > Signed-off-by: Sagi Maimon > --- > Addressed comments from Jakub Kicinski: > - https://www.spinics.net/lists/netdev/msg1090604.html > Changes since v2: > - Handle only freq_in and signal_out NULL pointer dereferences. > - Return -EINVAL for sysfs requests accessing out-of-bounds elements > in freq_in and signal_out arrays. > --- > --- > drivers/ptp/ptp_ocp.c | 40 +++++++++++++++++++++++++++++++++------- > 1 file changed, 33 insertions(+), 7 deletions(-) > > diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c > index 2ccdca4f6960..27ff4170f1a3 100644 > --- a/drivers/ptp/ptp_ocp.c > +++ b/drivers/ptp/ptp_ocp.c > @@ -315,6 +315,8 @@ struct ptp_ocp_serial_port { > #define OCP_BOARD_ID_LEN 13 > #define OCP_SERIAL_LEN 6 > #define OCP_SMA_NUM 4 > +#define OCP_SIGNAL_NUM 4 > +#define OCP_FREQ_NUM 4 > > enum { > PORT_GNSS, > @@ -342,8 +344,8 @@ struct ptp_ocp { > struct dcf_master_reg __iomem *dcf_out; > struct dcf_slave_reg __iomem *dcf_in; > struct tod_reg __iomem *nmea_out; > - struct frequency_reg __iomem *freq_in[4]; > - struct ptp_ocp_ext_src *signal_out[4]; > + struct frequency_reg __iomem *freq_in[OCP_FREQ_NUM]; > + struct ptp_ocp_ext_src *signal_out[OCP_SIGNAL_NUM]; > struct ptp_ocp_ext_src *pps; > struct ptp_ocp_ext_src *ts0; > struct ptp_ocp_ext_src *ts1; > @@ -378,10 +380,12 @@ struct ptp_ocp { > u32 utc_tai_offset; > u32 ts_window_adjust; > u64 fw_cap; > - struct ptp_ocp_signal signal[4]; > + struct ptp_ocp_signal signal[OCP_SIGNAL_NUM]; > struct ptp_ocp_sma_connector sma[OCP_SMA_NUM]; > const struct ocp_sma_op *sma_op; > struct dpll_device *dpll; > + int signals_nr; > + int freq_in_nr; > }; > > #define OCP_REQ_TIMESTAMP BIT(0) > @@ -2697,6 +2701,8 @@ ptp_ocp_fb_board_init(struct ptp_ocp *bp, struct ocp_resource *r) > bp->eeprom_map = fb_eeprom_map; > bp->fw_version = ioread32(&bp->image->version); > bp->sma_op = &ocp_fb_sma_op; > + bp->signals_nr = 4; > + bp->freq_in_nr = 4; > > ptp_ocp_fb_set_version(bp); > > @@ -2862,6 +2868,8 @@ ptp_ocp_art_board_init(struct ptp_ocp *bp, struct ocp_resource *r) > bp->fw_version = ioread32(&bp->reg->version); > bp->fw_tag = 2; > bp->sma_op = &ocp_art_sma_op; > + bp->signals_nr = 4; > + bp->freq_in_nr = 4; > > /* Enable MAC serial port during initialisation */ > iowrite32(1, &bp->board_config->mro50_serial_activate); > @@ -2888,6 +2896,8 @@ ptp_ocp_adva_board_init(struct ptp_ocp *bp, struct ocp_resource *r) > bp->flash_start = 0xA00000; > bp->eeprom_map = fb_eeprom_map; > bp->sma_op = &ocp_adva_sma_op; > + bp->signals_nr = 2; > + bp->freq_in_nr = 2; > > version = ioread32(&bp->image->version); > /* if lower 16 bits are empty, this is the fw loader. */ > @@ -3190,6 +3200,9 @@ signal_store(struct device *dev, struct device_attribute *attr, > if (!argv) > return -ENOMEM; > > + if (gen >= bp->signals_nr) > + return -EINVAL; > + > err = -EINVAL; > s.duty = bp->signal[gen].duty; > s.phase = bp->signal[gen].phase; > @@ -3247,6 +3260,10 @@ signal_show(struct device *dev, struct device_attribute *attr, char *buf) > int i; > > i = (uintptr_t)ea->var; > + > + if (i >= bp->signals_nr) > + return -EINVAL; > + > signal = &bp->signal[i]; > > count = sysfs_emit(buf, "%llu %d %llu %d", signal->period, > @@ -3359,6 +3376,9 @@ seconds_store(struct device *dev, struct device_attribute *attr, > u32 val; > int err; > > + if (idx >= bp->freq_in_nr) > + return -EINVAL; > + > err = kstrtou32(buf, 0, &val); > if (err) > return err; > @@ -3381,6 +3401,9 @@ seconds_show(struct device *dev, struct device_attribute *attr, char *buf) > int idx = (uintptr_t)ea->var; > u32 val; > > + if (idx >= bp->freq_in_nr) > + return -EINVAL; > + > val = ioread32(&bp->freq_in[idx]->ctrl); > if (val & 1) > val = (val >> 8) & 0xff; > @@ -3402,6 +3425,9 @@ frequency_show(struct device *dev, struct device_attribute *attr, char *buf) > int idx = (uintptr_t)ea->var; > u32 val; > > + if (idx >= bp->freq_in_nr) > + return -EINVAL; > + > val = ioread32(&bp->freq_in[idx]->status); > if (val & FREQ_STATUS_ERROR) > return sysfs_emit(buf, "error\n"); And as we statically export all 4 possible frequency/signal generators, it might be better to put constant string "UNSUPPORTED" in output instead of returning error. Otherwise it's not clear from user-space perspective the reason of the error. On write path the error is ok. > @@ -4008,7 +4034,7 @@ _signal_summary_show(struct seq_file *s, struct ptp_ocp *bp, int nr) > { > struct signal_reg __iomem *reg = bp->signal_out[nr]->mem; > struct ptp_ocp_signal *signal = &bp->signal[nr]; > - char label[8]; > + char label[16]; > bool on; > u32 val; > > @@ -4031,7 +4057,7 @@ static void > _frequency_summary_show(struct seq_file *s, int nr, > struct frequency_reg __iomem *reg) > { > - char label[8]; > + char label[16]; > bool on; > u32 val; > > @@ -4175,11 +4201,11 @@ ptp_ocp_summary_show(struct seq_file *s, void *data) > } > > if (bp->fw_cap & OCP_CAP_SIGNAL) > - for (i = 0; i < 4; i++) > + for (i = 0; i < bp->signals_nr; i++) > _signal_summary_show(s, bp, i); > > if (bp->fw_cap & OCP_CAP_FREQ) > - for (i = 0; i < 4; i++) > + for (i = 0; i < bp->freq_in_nr; i++) > _frequency_summary_show(s, i, bp->freq_in[i]); > > if (bp->irig_out) {