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a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1697573487; l=4966; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=gHDinb9a9sswIvj29QskOHXNeesA8YN3gdLsehwyx1o=; b=nAmbdGpBqSQNB9t1IYFTrpRaeC1QGXnuDgq0waS/15OL6TsrXeiVeYGUhvKYWMguhBQNEWYZk gJw9TTzVK+NDSiJlDVIqhgFT6x7JwDNKYduhIJHm8v3luvNPMUIb0OH X-Mailer: b4 0.12.3 Message-ID: <20231017-strncpy-drivers-net-wireless-broadcom-brcm80211-brcmfmac-cfg80211-c-v3-1-af780d74ae38@google.com> Subject: [PATCH v3 1/2] wifi: brcm80211: replace deprecated strncpy with strscpy From: Justin Stitt To: Arend van Spriel , Franky Lin , Hante Meuleman , Kalle Valo Cc: linux-wireless@vger.kernel.org, brcm80211-dev-list.pdl@broadcom.com, SHA-cyfmac-dev-list@infineon.com, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt X-Spam-Status: No, score=-8.4 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on pete.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (pete.vger.email [0.0.0.0]); Tue, 17 Oct 2023 13:11:59 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1780034853142363280 X-GMAIL-MSGID: 1780034853142363280 Let's move away from using strncpy and instead favor a less ambiguous and more robust interface. For ifp->ndev->name, we expect ifp->ndev->name to be NUL-terminated based on its use in format strings within core.c: 67 | char *brcmf_ifname(struct brcmf_if *ifp) 68 | { 69 | if (!ifp) 70 | return ""; 71 | 72 | if (ifp->ndev) 73 | return ifp->ndev->name; 74 | 75 | return ""; 76 | } ... 288 | static netdev_tx_t brcmf_netdev_start_xmit(struct sk_buff *skb, 289 | struct net_device *ndev) { ... 330 | brcmf_dbg(INFO, "%s: insufficient headroom (%d)\n", 331 | brcmf_ifname(ifp), head_delta); ... 336 | bphy_err(drvr, "%s: failed to expand headroom\n", 337 | brcmf_ifname(ifp)); For di->name, we expect di->name to be NUL-terminated based on its usage with format strings: | brcms_dbg_dma(di->core, | "%s: DMA64 tx doesn't have AE set\n", | di->name); Looking at its allocation we can see that it is already zero-allocated which means NUL-padding is not required: | di = kzalloc(sizeof(struct dma_info), GFP_ATOMIC); For wlc->modulecb[i].name, we expect each name in wlc->modulecb to be NUL-terminated based on their usage with strcmp(): | if (!strcmp(wlc->modulecb[i].name, name) && NUL-padding is not required as wlc is zero-allocated in: brcms_c_attach_malloc() -> | wlc = kzalloc(sizeof(struct brcms_c_info), GFP_ATOMIC); For all these cases, a suitable replacement is `strscpy` due to the fact that it guarantees NUL-termination on the destination buffer without unnecessarily NUL-padding. Signed-off-by: Justin Stitt Reviewed-by: Kees Cook --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 2 +- drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c | 2 +- drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.c | 3 +-- drivers/net/wireless/broadcom/brcm80211/brcmsmac/main.c | 4 ++-- 4 files changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c index 2a90bb24ba77..7daa418df877 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c @@ -866,7 +866,7 @@ struct wireless_dev *brcmf_apsta_add_vif(struct wiphy *wiphy, const char *name, goto fail; } - strncpy(ifp->ndev->name, name, sizeof(ifp->ndev->name) - 1); + strscpy(ifp->ndev->name, name, sizeof(ifp->ndev->name)); err = brcmf_net_attach(ifp, true); if (err) { bphy_err(drvr, "Registering netdevice failed\n"); diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c index d4492d02e4ea..6e0c90f4718b 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c @@ -2334,7 +2334,7 @@ struct wireless_dev *brcmf_p2p_add_vif(struct wiphy *wiphy, const char *name, goto fail; } - strncpy(ifp->ndev->name, name, sizeof(ifp->ndev->name) - 1); + strscpy(ifp->ndev->name, name, sizeof(ifp->ndev->name)); ifp->ndev->name_assign_type = name_assign_type; err = brcmf_net_attach(ifp, true); if (err) { diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.c index b7df576bb84d..3d5c1ef8f7f2 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.c @@ -584,8 +584,7 @@ struct dma_pub *dma_attach(char *name, struct brcms_c_info *wlc, rxextheadroom, nrxpost, rxoffset, txregbase, rxregbase); /* make a private copy of our callers name */ - strncpy(di->name, name, MAXNAMEL); - di->name[MAXNAMEL - 1] = '\0'; + strscpy(di->name, name, sizeof(di->name)); di->dmadev = core->dma_dev; diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/main.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/main.c index b3663c5ef382..34460b5815d0 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/main.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/main.c @@ -5551,8 +5551,8 @@ int brcms_c_module_register(struct brcms_pub *pub, /* find an empty entry and just add, no duplication check! */ for (i = 0; i < BRCMS_MAXMODULES; i++) { if (wlc->modulecb[i].name[0] == '\0') { - strncpy(wlc->modulecb[i].name, name, - sizeof(wlc->modulecb[i].name) - 1); + strscpy(wlc->modulecb[i].name, name, + sizeof(wlc->modulecb[i].name)); wlc->modulecb[i].hdl = hdl; wlc->modulecb[i].down_fn = d_fn; return 0; From patchwork Tue Oct 17 20:11:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Justin Stitt X-Patchwork-Id: 154487 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:612c:2908:b0:403:3b70:6f57 with SMTP id ib8csp4374895vqb; Tue, 17 Oct 2023 13:12:12 -0700 (PDT) X-Google-Smtp-Source: AGHT+IF0wF4GZYd3M8oPvcvSSAy0UavqG1JE8Mjz2lEY873dC4YIFBcbLOtJhWH9hBzuVfcAn8Bf X-Received: by 2002:a17:90b:38cf:b0:27d:32d8:5f23 with SMTP id nn15-20020a17090b38cf00b0027d32d85f23mr3506393pjb.2.1697573531858; Tue, 17 Oct 2023 13:12:11 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1697573531; cv=none; d=google.com; s=arc-20160816; b=zVHkx1Msb6KF7w/k6lO2PZs7e7/5vUec7zlq83pax5k3vDQRscABTaWl7x9dyYnjJu ofxSF4XGefEitRoCfT+qNxb5eOMZ0hxj44yjzXJLweBIxFWJOysfyG/JNtsuyFweRMEM hGPOrR0x15vDMzUo6N0/oiIykPTE50T0TbyROXupr1KbGwkZaZVY8a68kBX856vfrOOK bu4sikx2qU9IhgsqbjOaZXiVqsNWSscMrghnZEjG+V6j6Ro1qztwWMJsk0zerEa/KOIt iXiwf1vs90hubLCM6/idbmXHEeGDOIKudDkG+rcTdYdg5Ohaht1c512dfmbFwzF/PnG3 Cvxg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:dkim-signature; bh=U16d/1k+vtJxpQ32+/WF4Jgqek04k8/6Qv2CuyTmXCM=; fh=uTDDIAOzZHrGQiRjaaVRH1j1wCDASENNndO7J8flYao=; b=m+eoxlm7HICsxzALZ4s5PpTnfEFIkd+XUH5dA3KrDQ/xpyIj16ZwllH72ahMUW6/qe WAZFCN3a+9QtPpdlCIfviTsPngUAZqam7X/wD0T74GLQXYHRhQEKGgnkWkC04UXmFDC3 MFurDl5rBciUCzMG3cX9CK2dGivZTZlcyT+kRK6efaiiGO6ncWtnVJKydFOgxmEoZZBy NlEGn0zy+tyNLPdKGthcFneSCwUnHb6bOSDlEIa21WtzwhVOGV7urfy+0yUZuUXcQXA3 ClUHRMsNM4ZLLo+Nbd2oPSaRTGIwl32AWAruPNxr5Whkx4UYLINHYJWdJtt4VlMJZGyH xjrw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@google.com header.s=20230601 header.b=GDEw2UZD; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from lipwig.vger.email (lipwig.vger.email. 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a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1697573487; l=2638; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=zJRX9bfYMLnf8bwx/y1SqZRLrWT3yCChHrc9KJ+aw0g=; b=36Wx10SOxayn+TXLBPF3Sdbo+ZOjyWFKEXOZQUWfzf/HDZaBLlDvUd/FbJiQtsFySN1BKVG9K S2f9g+oP7StAX9U5Iv2XSJNPkbxap07eIIAsrMoZPt/V36oDC327Jgg X-Mailer: b4 0.12.3 Message-ID: <20231017-strncpy-drivers-net-wireless-broadcom-brcm80211-brcmfmac-cfg80211-c-v3-2-af780d74ae38@google.com> Subject: [PATCH v3 2/2] wifi: brcmsmac: replace deprecated strncpy with memcpy From: Justin Stitt To: Arend van Spriel , Franky Lin , Hante Meuleman , Kalle Valo Cc: linux-wireless@vger.kernel.org, brcm80211-dev-list.pdl@broadcom.com, SHA-cyfmac-dev-list@infineon.com, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt X-Spam-Status: No, score=-8.4 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Tue, 17 Oct 2023 13:12:04 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1780034863723563554 X-GMAIL-MSGID: 1780034863723563554 Let's move away from using strncpy and instead use the more obvious interface for this context. For wlc->pub->srom_ccode, we're just copying two bytes from ccode into wlc->pub->srom_ccode with no expectation that srom_ccode be NUL-terminated: wlc->pub->srom_ccode is only used in regulatory_hint(): 1193 | if (wl->pub->srom_ccode[0] && 1194 | regulatory_hint(wl->wiphy, wl->pub->srom_ccode)) 1195 | wiphy_err(wl->wiphy, "%s: regulatory hint failed\n", __func__); We can see that only index 0 and index 1 are accessed. 3307 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) 3308 | { ... | ... 3322 | request->alpha2[0] = alpha2[0]; 3323 | request->alpha2[1] = alpha2[1]; ... | ... 3332 | } Since this is just a simple byte copy with correct lengths, let's use memcpy(). There should be no functional change. In a similar boat, both wlc->country_default and wlc->autocountry_default are just simple byte copies so let's use memcpy. However, FWICT they aren't used anywhere. (they should be used or removed -- not in scope of my patch, though). Signed-off-by: Justin Stitt Reviewed-by: Kees Cook --- drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.c index 5a6d9c86552a..f6962e558d7c 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.c @@ -341,7 +341,7 @@ struct brcms_cm_info *brcms_c_channel_mgr_attach(struct brcms_c_info *wlc) /* store the country code for passing up as a regulatory hint */ wlc_cm->world_regd = brcms_world_regd(ccode, ccode_len); if (brcms_c_country_valid(ccode)) - strncpy(wlc->pub->srom_ccode, ccode, ccode_len); + memcpy(wlc->pub->srom_ccode, ccode, ccode_len); /* * If no custom world domain is found in the SROM, use the @@ -354,10 +354,10 @@ struct brcms_cm_info *brcms_c_channel_mgr_attach(struct brcms_c_info *wlc) } /* save default country for exiting 11d regulatory mode */ - strncpy(wlc->country_default, ccode, ccode_len); + memcpy(wlc->country_default, ccode, ccode_len); /* initialize autocountry_default to driver default */ - strncpy(wlc->autocountry_default, ccode, ccode_len); + memcpy(wlc->autocountry_default, ccode, ccode_len); brcms_c_set_country(wlc_cm, wlc_cm->world_regd);