From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 8AE92255E4C; Thu, 17 Apr 2025 18:02:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744912949; cv=none; b=C+/SKCGR+Re+yXETnMD4cpWExBmX9rUY+1LQnqeQ7FSmGENFcdimJPEGfjSxYe9O1HUPSwgtLrpQSnttb3u7I9WLb9wj4uIXHfFKcUdOs2mT5ngUW6JhfWY6zmr236dN4Uzf+glHGTBXP6rND0lcflQH4IZ0tNbQzO+l2wIxQVg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744912949; c=relaxed/simple; bh=O6I9yvWPAirAE6Z0r4WWffIH8+x8o5GAqIBfoCPghdY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ozRk8p3r1Sjxc2IUIfCIjYPgcgay56KtkgKqDT+7XH7v5yPxAjN4FQDtZW7rMgbu2mc4p27LdnQ4akKiS1TJT+f6kZs0dZFWjf6gI9nKj5kZpwq+sqMaDDKteJv1FeRrlHmA6SjlnMpeXD/IGB8j0QSif2ilQ5PRHdY1Eq/HSRA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zIwtdTqy; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="zIwtdTqy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0AD26C4CEE4; Thu, 17 Apr 2025 18:02:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744912949; bh=O6I9yvWPAirAE6Z0r4WWffIH8+x8o5GAqIBfoCPghdY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zIwtdTqyBEVuWks5oU7oQJTLR1ksT2fmbpssVj3ShSVn5QQdOJtNZ7bT7aZyN1GH6 GwJb7y/qCh2GqoitYpEP7bH8lT+aQuXfFCHHqPl/ME42W/eakO/IBRmBAnv6Ykd7dI LQvzwe9OUfnfoc4PsevOOC3gB0IOPRmG72Nc1jIo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Bingbu Cao , Philipp Stanner , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Bjorn Helgaas , Sasha Levin Subject: [PATCH 6.14 178/449] PCI: Check BAR index for validity Date: Thu, 17 Apr 2025 19:47:46 +0200 Message-ID: <20250417175125.144330221@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250417175117.964400335@linuxfoundation.org> References: <20250417175117.964400335@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Philipp Stanner [ Upstream commit b1a7f99967fc0c052db8e65b449c7b32b1e9177f ] Many functions in PCI use accessor macros such as pci_resource_len(), which take a BAR index. That index, however, is never checked for validity, potentially resulting in undefined behavior by overflowing the array pci_dev.resource in the macro pci_resource_n(). Since many users of those macros directly assign the accessed value to an unsigned integer, the macros cannot be changed easily anymore to return -EINVAL for invalid indexes. Consequently, the problem has to be mitigated in higher layers. Add pci_bar_index_valid(). Use it where appropriate. Link: https://lore.kernel.org/r/20250312080634.13731-4-phasta@kernel.org Closes: https://lore.kernel.org/all/adb53b1f-29e1-3d14-0e61-351fd2d3ff0d@linux.intel.com/ Reported-by: Bingbu Cao Signed-off-by: Philipp Stanner [kwilczynski: correct if-statement condition the pci_bar_index_is_valid() helper function uses, tidy up code comments] Signed-off-by: Krzysztof Wilczyński [bhelgaas: fix typo] Signed-off-by: Bjorn Helgaas Signed-off-by: Sasha Levin --- drivers/pci/devres.c | 16 ++++++++++++++-- drivers/pci/iomap.c | 29 +++++++++++++++++++++-------- drivers/pci/pci.c | 6 ++++++ drivers/pci/pci.h | 16 ++++++++++++++++ 4 files changed, 57 insertions(+), 10 deletions(-) diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c index 3431a7df3e0d9..d2c09589c537e 100644 --- a/drivers/pci/devres.c +++ b/drivers/pci/devres.c @@ -577,7 +577,7 @@ static int pcim_add_mapping_to_legacy_table(struct pci_dev *pdev, { void __iomem **legacy_iomap_table; - if (bar >= PCI_STD_NUM_BARS) + if (!pci_bar_index_is_valid(bar)) return -EINVAL; legacy_iomap_table = (void __iomem **)pcim_iomap_table(pdev); @@ -622,7 +622,7 @@ static void pcim_remove_bar_from_legacy_table(struct pci_dev *pdev, int bar) { void __iomem **legacy_iomap_table; - if (bar >= PCI_STD_NUM_BARS) + if (!pci_bar_index_is_valid(bar)) return; legacy_iomap_table = (void __iomem **)pcim_iomap_table(pdev); @@ -655,6 +655,9 @@ void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen) void __iomem *mapping; struct pcim_addr_devres *res; + if (!pci_bar_index_is_valid(bar)) + return NULL; + res = pcim_addr_devres_alloc(pdev); if (!res) return NULL; @@ -722,6 +725,9 @@ void __iomem *pcim_iomap_region(struct pci_dev *pdev, int bar, int ret; struct pcim_addr_devres *res; + if (!pci_bar_index_is_valid(bar)) + return IOMEM_ERR_PTR(-EINVAL); + res = pcim_addr_devres_alloc(pdev); if (!res) return IOMEM_ERR_PTR(-ENOMEM); @@ -823,6 +829,9 @@ static int _pcim_request_region(struct pci_dev *pdev, int bar, const char *name, int ret; struct pcim_addr_devres *res; + if (!pci_bar_index_is_valid(bar)) + return -EINVAL; + res = pcim_addr_devres_alloc(pdev); if (!res) return -ENOMEM; @@ -991,6 +1000,9 @@ void __iomem *pcim_iomap_range(struct pci_dev *pdev, int bar, void __iomem *mapping; struct pcim_addr_devres *res; + if (!pci_bar_index_is_valid(bar)) + return IOMEM_ERR_PTR(-EINVAL); + res = pcim_addr_devres_alloc(pdev); if (!res) return IOMEM_ERR_PTR(-ENOMEM); diff --git a/drivers/pci/iomap.c b/drivers/pci/iomap.c index 9fb7cacc15cde..fe706ed946dfd 100644 --- a/drivers/pci/iomap.c +++ b/drivers/pci/iomap.c @@ -9,6 +9,8 @@ #include +#include "pci.h" /* for pci_bar_index_is_valid() */ + /** * pci_iomap_range - create a virtual mapping cookie for a PCI BAR * @dev: PCI device that owns the BAR @@ -33,12 +35,19 @@ void __iomem *pci_iomap_range(struct pci_dev *dev, unsigned long offset, unsigned long maxlen) { - resource_size_t start = pci_resource_start(dev, bar); - resource_size_t len = pci_resource_len(dev, bar); - unsigned long flags = pci_resource_flags(dev, bar); + resource_size_t start, len; + unsigned long flags; + + if (!pci_bar_index_is_valid(bar)) + return NULL; + + start = pci_resource_start(dev, bar); + len = pci_resource_len(dev, bar); + flags = pci_resource_flags(dev, bar); if (len <= offset || !start) return NULL; + len -= offset; start += offset; if (maxlen && len > maxlen) @@ -77,16 +86,20 @@ void __iomem *pci_iomap_wc_range(struct pci_dev *dev, unsigned long offset, unsigned long maxlen) { - resource_size_t start = pci_resource_start(dev, bar); - resource_size_t len = pci_resource_len(dev, bar); - unsigned long flags = pci_resource_flags(dev, bar); + resource_size_t start, len; + unsigned long flags; - - if (flags & IORESOURCE_IO) + if (!pci_bar_index_is_valid(bar)) return NULL; + start = pci_resource_start(dev, bar); + len = pci_resource_len(dev, bar); + flags = pci_resource_flags(dev, bar); + if (len <= offset || !start) return NULL; + if (flags & IORESOURCE_IO) + return NULL; len -= offset; start += offset; diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 3e78cf86ef03b..3152750aab2fc 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3929,6 +3929,9 @@ EXPORT_SYMBOL(pci_enable_atomic_ops_to_root); */ void pci_release_region(struct pci_dev *pdev, int bar) { + if (!pci_bar_index_is_valid(bar)) + return; + /* * This is done for backwards compatibility, because the old PCI devres * API had a mode in which the function became managed if it had been @@ -3973,6 +3976,9 @@ EXPORT_SYMBOL(pci_release_region); static int __pci_request_region(struct pci_dev *pdev, int bar, const char *name, int exclusive) { + if (!pci_bar_index_is_valid(bar)) + return -EINVAL; + if (pci_is_managed(pdev)) { if (exclusive == IORESOURCE_EXCLUSIVE) return pcim_request_region_exclusive(pdev, bar, name); diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 01e51db8d285a..d22755de688b8 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -167,6 +167,22 @@ static inline void pci_wakeup_event(struct pci_dev *dev) pm_wakeup_event(&dev->dev, 100); } +/** + * pci_bar_index_is_valid - Check whether a BAR index is within valid range + * @bar: BAR index + * + * Protects against overflowing &struct pci_dev.resource array. + * + * Return: true for valid index, false otherwise. + */ +static inline bool pci_bar_index_is_valid(int bar) +{ + if (bar >= 0 && bar < PCI_NUM_RESOURCES) + return true; + + return false; +} + static inline bool pci_has_subordinate(struct pci_dev *pci_dev) { return !!(pci_dev->subordinate); -- 2.39.5