From patchwork Fri Aug 21 14:52:40 2026 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vijay Anusuri X-Patchwork-Id: 96010 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16F52C5DF93 for ; Fri, 21 Aug 2026 14:53:15 +0000 (UTC) Received: from mail-pj1-f52.google.com (mail-pj1-f52.google.com [209.85.216.52]) by mx.groups.io with SMTP id smtpd.msgproc02-g2.9144.1787323985370059936 for ; Fri, 21 Aug 2026 07:53:05 -0700 Authentication-Results: mx.groups.io; dkim=pass header.i=@mvista.com header.s=google header.b=JROrUMjN; spf=pass (domain: mvista.com, ip: 209.85.216.52, mailfrom: vanusuri@mvista.com) Received: by mail-pj1-f52.google.com with SMTP id 98e67ed59e1d1-38dc4553f62so1311035a91.0 for ; Fri, 21 Aug 2026 07:53:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mvista.com; s=google; t=1787323985; x=1787928785; darn=lists.openembedded.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=wYJu27qUpUpyUHXEBDveX5NhH4iADzw4PmMN9M6nUh0=; b=JROrUMjNvHCXJYpYnIHXTxo9XTz0Cvht+wjH5t6ssgx03EnExTLPQ1VRSBs0Ao1kRY bkiKQvkozk7xtGCx13dPhMb9LOJ16xpgFeg3A0q+iihTz3EWXpsyDW7ugexqE3Yepmhw oUWqekux2I+SF/yqION1rs1C6vtfsWmjbE+0c= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787323985; x=1787928785; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=wYJu27qUpUpyUHXEBDveX5NhH4iADzw4PmMN9M6nUh0=; b=rflOFhMfnu7/pUEAIp7ztZm5gYdMU7rUDSPo3/yEgAWThC5jpDMoqwQ7u0airrXMa5 N7UKLoPqDF/J4/kx9ErKIJvvapWCTywDH2SPpNmZ7oWILklzwh97EpgzDfZsbq23XlO/ y89X24AvVyNfciYRgt7MdD2JR6mGWQVpQIBeumObP1QYeFBsOLdaxYzOKYBt9vGSsUN2 s9mHt81DsJtZMGd4I/CaJ16q+jkRO5OTfGfml1ibjsTo7LlKZodlFbsHEAg8wFnFWfcR ZHpYLaif3yzA9q/kbsRxco51rEJkOwqg1xdxpd0aandMzOFrSj8DIdnVF/D/jMJkZ8g8 nnkA== X-Gm-Message-State: AFuF++l/fZmcqhovflJzTAePb5Ua1k1uNc7W7fv0vsYyZ1UqgElq8NUF jV9tnSVDDBypEX7GJ0KsKAny9qRqE+kZhCo0ZjTYdaUYgHBXRb5I/mXOJ2VzDNGFU3lkAQcmXPg Vz12E X-Gm-Gg: AR+sD11Ur2Whv+FDE9MTcPQACk/L6aKfEm5Z0ExH2Zcfvk+3MDK3vLEGGQ2cVW/0CRN QDZmsyYgTj/bQQ4Wu6tOXiCSRVko9vwBDAhuv/CSHyLCB8hvNYMboWgHm+urVwH6vYB+4hzUDHz zV/Z1n3Hguqvm8QJ9+o/5YSI7WgWZCO8SkE1sSe9kTatfKqsef5u/+6lMkJMtgyle+bhfIU12JD ZZOmWoGM5sTAKoD3C8q4zTWeFvDerMnfye9bsGaT6O5FqIorqDcR9Zf172h1Pdk+48AfZoZph4C It2qqQGgwx4roRO1FmwnlyHFiRdpdcjCaRZrQnmzQEKeqzHTI/cK/e1yvJcswwyyjRdDv/E4L/V AAEoTMduEyaWfxuiR2hHWa855CpWsuF90KvF1HgL8Vs6vMg3A0xmBSLSIorUE5JFN6OyS7luP/F uKpYo9XSsLq/jydJUh+Fey4gkcn3D34OPQS2l20sMUwgQIO2RQPNt1zHmvSCrQkGtYJ5qsJwyjT l8k X-Received: by 2002:a17:90b:164e:b0:38e:57a3:f218 with SMTP id 98e67ed59e1d1-395c3733afdmr11382799a91.13.1787323984663; Fri, 21 Aug 2026 07:53:04 -0700 (PDT) Received: from MVIN00352.mvista.com ([2401:4900:1cc4:8284:9dd5:5a04:5eb2:4372]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-327bef6ec40sm29820194eec.7.2026.08.21.07.53.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Aug 2026 07:53:04 -0700 (PDT) From: Vijay Anusuri To: openembedded-core@lists.openembedded.org Cc: Vijay Anusuri Subject: [OE-core][wrynose][patch 3/3] libxfont2: Fix CVE-2026-56003 Date: Fri, 21 Aug 2026 20:22:40 +0530 Message-ID: <20260821145240.137814-3-vanusuri@mvista.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260821145240.137814-1-vanusuri@mvista.com> References: <20260821145240.137814-1-vanusuri@mvista.com> MIME-Version: 1.0 List-Id: X-Webhook-Received: from 45-33-107-173.ip.linodeusercontent.com [45.33.107.173] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Fri, 21 Aug 2026 14:53:15 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/243945 Pick patch according to [2] [1] https://nvd.nist.gov/vuln/detail/CVE-2026-56003 [2] https://security-tracker.debian.org/tracker/CVE-2026-56003 Signed-off-by: Vijay Anusuri --- .../xorg-lib/libxfont2/CVE-2026-56003.patch | 114 ++++++++++++++++++ .../xorg-lib/libxfont2_2.0.7.bb | 1 + 2 files changed, 115 insertions(+) create mode 100644 meta/recipes-graphics/xorg-lib/libxfont2/CVE-2026-56003.patch diff --git a/meta/recipes-graphics/xorg-lib/libxfont2/CVE-2026-56003.patch b/meta/recipes-graphics/xorg-lib/libxfont2/CVE-2026-56003.patch new file mode 100644 index 0000000000..dacfa9d638 --- /dev/null +++ b/meta/recipes-graphics/xorg-lib/libxfont2/CVE-2026-56003.patch @@ -0,0 +1,114 @@ +From dff957a5158da038a282a59a31fe736702732939 Mon Sep 17 00:00:00 2001 +From: Peter Hutterer +Date: Mon, 1 Jun 2026 16:49:55 +1000 +Subject: [PATCH] bitscale: add bounds check to computeProps for property + buffer + +ComputeScaledProperties allocates a fixed-size property buffer of 70 +slots. computeProps iterates the source font's properties and writes 1 +slot for unscaled properties or 2 slots for scaledX/scaledY properties, +with no bounds check. A malicious font with many duplicate properties +matching fontPropTable entries can overflow the allocated buffer. + +Fix this by passing the remaining buffer capacity to computeProps and +checking it before each write. Properties that would exceed the buffer +are silently skipped. + +The function is also restructured to handle the buffer writes for +scaledX/scaledY inside the switch cases directly, rather than in a +separate block after the switch. This makes the control flow clearer and +ensures the bounds check covers all writes. + +This vulnerability was discovered by: +Anonymous working with TrendAI Zero Day Initiative + +CVE-2026-56003/ZDI-CAN-30560 + +Assisted-by: Claude:claude-opus-4-6 +Signed-off-by: Peter Hutterer +Part-of: + +Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939] +CVE: CVE-2026-56003 +Signed-off-by: Vijay Anusuri +--- + src/bitmap/bitscale.c | 39 ++++++++++++++++++++------------------- + 1 file changed, 20 insertions(+), 19 deletions(-) + +diff --git a/src/bitmap/bitscale.c b/src/bitmap/bitscale.c +index 5f465d1..ec57f55 100644 +--- a/src/bitmap/bitscale.c ++++ b/src/bitmap/bitscale.c +@@ -507,7 +507,8 @@ static int + computeProps(FontPropPtr pf, char *wasStringProp, + FontPropPtr npf, char *isStringProp, + unsigned int nprops, double xfactor, double yfactor, +- double sXfactor, double sYfactor) ++ double sXfactor, double sYfactor, ++ int maxprops) + { + int n; + int count; +@@ -522,14 +523,26 @@ computeProps(FontPropPtr pf, char *wasStringProp, + + switch (t->type) { + case scaledX: +- npf->value = doround(xfactor * (double)pf->value); +- rawfactor = sXfactor; +- break; + case scaledY: +- npf->value = doround(yfactor * (double)pf->value); +- rawfactor = sYfactor; ++ if (count + 2 > maxprops) ++ continue; ++ npf->value = (t->type == scaledX) ++ ? doround(xfactor * (double)pf->value) ++ : doround(yfactor * (double)pf->value); ++ rawfactor = (t->type == scaledX) ? sXfactor : sYfactor; ++ npf->name = pf->name; ++ npf++; ++ count++; ++ npf->value = doround(rawfactor * (double)pf->value); ++ npf->name = rawFontPropTable[t - fontPropTable].atom; ++ npf++; ++ count++; ++ *isStringProp++ = *wasStringProp; ++ *isStringProp++ = *wasStringProp; + break; + case unscaled: ++ if (count + 1 > maxprops) ++ continue; + npf->value = pf->value; + npf->name = pf->name; + npf++; +@@ -539,18 +552,6 @@ computeProps(FontPropPtr pf, char *wasStringProp, + default: + break; + } +- if (t->type != unscaled) +- { +- npf->name = pf->name; +- npf++; +- count++; +- npf->value = doround(rawfactor * (double)pf->value); +- npf->name = rawFontPropTable[t - fontPropTable].atom; +- npf++; +- count++; +- *isStringProp++ = *wasStringProp; +- *isStringProp++ = *wasStringProp; +- } + } + return count; + } +@@ -667,7 +668,7 @@ ComputeScaledProperties(FontInfoPtr sourceFontInfo, /* the font to be scaled */ + n = NPROPS; + n += computeProps(sourceFontInfo->props, sourceFontInfo->isStringProp, + fp, isStringProp, sourceFontInfo->nprops, dx, dy, +- sdx, sdy); ++ sdx, sdy, nProps - NPROPS); + return n; + } + +-- +GitLab + diff --git a/meta/recipes-graphics/xorg-lib/libxfont2_2.0.7.bb b/meta/recipes-graphics/xorg-lib/libxfont2_2.0.7.bb index e004ac044c..de6418b11a 100644 --- a/meta/recipes-graphics/xorg-lib/libxfont2_2.0.7.bb +++ b/meta/recipes-graphics/xorg-lib/libxfont2_2.0.7.bb @@ -17,6 +17,7 @@ BBCLASSEXTEND = "native" SRC_URI += "file://CVE-2026-56001.patch \ file://CVE-2026-56002.patch \ + file://CVE-2026-56003.patch \ " SRC_URI[sha256sum] = "8b7b82fdeba48769b69433e8e3fbb984a5f6bf368b0d5f47abeec49de3e58efb"