From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 88300345EB7; Fri, 7 Aug 2026 14:50:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786114255; cv=none; b=L14qQCqauzOU2KPAhVZuhbj40RbSVxSuvSPxy/j+rgCbINMB4ie9P1JKVWSW8JaJZgkf1JBJ2zwVVXYpw2eLtwmwFrw2QDLHCKH291Z2IjbP56Ke/XecbDhRNSRA7TADBL1QIwI/Kq7YhRQIoj0i0V2D8ZX4Vhm6vaR7nPWwORc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786114255; c=relaxed/simple; bh=It+3bUQFyhntYpoT+3nYJqWyGukEFrNVBgXAI6TIUd4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=X1FM6Eimmx0XE/LfASL5lDxnjMvMor3eq7A1XH8j/sYn27wehE2KGWmH/rsTHEelcs2Cwi/u6Mfa+0KEGAY3dubQoL+AFPa0PpMPvydDDFthhGbB1JzqSII0ArZkt1UzfxMuzE4qBctgL6KuXSdXEdTO08Lz2LfodWbeJ5T+ZYI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ZX7d2HSg; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ZX7d2HSg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C4E1B1F000E9; Fri, 7 Aug 2026 14:50:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786114249; bh=qxQNbpjw0Xz/Skk+mXuLsquEO3oWUz29LNAkqVVwKbY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ZX7d2HSgbsVf87sw814cvER7RHGlw/DJ8CI0y5eUQfO/pL5GVbLuJp17c54v6FYyx yatYe1bcgbkwW6JR1s/CJjjFTvcWRK7cjWV5nq0QRc0rY/7FA/mi5OHPTMybIvGSmj BSNyUF38kPSEeeDwidML1wShqHzOvlPD/HcIDrwg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Damien Le Moal , Ibrahim Hashimov , Bart Van Assche , "Martin K. Petersen" Subject: [PATCH 6.12 197/337] scsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write Date: Fri, 7 Aug 2026 16:36:40 +0200 Message-ID: <20260807143422.824673786@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260807143418.516897842@linuxfoundation.org> References: <20260807143418.516897842@linuxfoundation.org> User-Agent: quilt/0.69 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-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ibrahim Hashimov commit 93dde0bf2f39a0f9f57fd610aa3201ce5b753433 upstream. resp_report_zones() sizes the reply buffer from the CDB allocation length. The v3 fix rounds alloc_len up with ALIGN() before deriving the descriptor count: rep_max_zones = (ALIGN((u64)alloc_len, RZONES_DESC_HD) - RZONES_DESC_HD) >> ilog2(RZONES_DESC_HD); arr_len = (u64)RZONES_DESC_HD * (rep_max_zones + 1); For alloc_len in 0xFFFFFFC1..0xFFFFFFFF, ALIGN() rounds up to 0x100000000, so arr_len is 4 GB. On 32-bit, kzalloc()'s size_t is 32-bit and truncates 0x100000000 to 0; kzalloc(0) returns ZERO_SIZE_PTR, which passes the !arr check, and desc = arr + 64 is then dereferenced in the loop -> out-of-bounds write / panic. Clamp rep_max_zones to devip->nr_zones. The loop already stops at sdebug_capacity (after nr_zones zones), so a report can never hold more than nr_zones descriptors; the clamp does not change the report, it only bounds arr_len to (nr_zones + 1) * RZONES_DESC_HD, a real device property that can never reach 0x100000000. Fixes: 7db0e0c8190a ("scsi: scsi_debug: Fix buffer size of REPORT ZONES command") Suggested-by: Damien Le Moal Cc: stable@vger.kernel.org Signed-off-by: Ibrahim Hashimov Assisted-by: AuditCode-AI:2026.07 Reviewed-by: Damien Le Moal Reviewed-by: Bart Van Assche Link: https://patch.msgid.link/20260712183739.83915-1-security@auditcode.ai Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/scsi_debug.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -5191,6 +5191,7 @@ static int resp_report_zones(struct scsi u32 alloc_len, rep_opts, rep_len; bool partial; u64 lba, zs_lba; + u64 arr_len; u8 *arr = NULL, *desc; u8 *cmd = scp->cmnd; struct sdeb_zone_state *zsp = NULL; @@ -5212,9 +5213,12 @@ static int resp_report_zones(struct scsi return check_condition_result; } - rep_max_zones = (alloc_len - 64) >> ilog2(RZONES_DESC_HD); + rep_max_zones = (ALIGN((u64)alloc_len, RZONES_DESC_HD) - RZONES_DESC_HD) >> + ilog2(RZONES_DESC_HD); + rep_max_zones = min_t(unsigned int, rep_max_zones, devip->nr_zones); + arr_len = (u64)RZONES_DESC_HD * (rep_max_zones + 1); - arr = kzalloc(alloc_len, GFP_ATOMIC | __GFP_NOWARN); + arr = kzalloc(arr_len, GFP_ATOMIC | __GFP_NOWARN); if (!arr) { mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, INSUFF_RES_ASCQ);