From ff917923f4fb9c83717ba135ee47d7e4c1567bb7 Mon Sep 17 00:00:00 2001 From: Muhammad Bilal Date: Tue, 28 Jul 2026 17:54:55 +0500 Subject: staging: rtl8723bs: fix OOB read in rtw_action_frame_parse() rtw_action_frame_parse() takes a frame_len parameter but never actually checks it before indexing into the frame body: const u8 *frame_body = frame + sizeof(struct ieee80211_hdr_3addr); ... c = frame_body[0]; ... a = frame_body[1]; frame_body already points 24 bytes (sizeof(struct ieee80211_hdr_3addr)) into frame, so reading frame_body[0] and frame_body[1] requires frame_len >= 26. A management action frame shorter than that (e.g. exactly 24 bytes, the minimum a malicious peer can send) causes a 1-2 byte out-of-bounds read. This is reachable from rtw_cfg80211_monitor_if_xmit_entry() and cfg80211_rtw_mgmt_tx() in ioctl_cfg80211.c, both of which pass attacker/user-influenced frame buffers and lengths straight through. Add the missing length check before frame_body is dereferenced. Fixes: 554c0a3abf216 ("staging: Add rtl8723bs sdio wifi driver") Cc: stable@vger.kernel.org Signed-off-by: Muhammad Bilal Link: https://patch.msgid.link/20260728125456.32359-3-meatuni001@gmail.com Signed-off-by: Greg Kroah-Hartman --- security/integrity/efi_secureboot.c | 56 +++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 security/integrity/efi_secureboot.c (limited to 'security/integrity/efi_secureboot.c') diff --git a/security/integrity/efi_secureboot.c b/security/integrity/efi_secureboot.c new file mode 100644 index 000000000..bfd4260a8 --- /dev/null +++ b/security/integrity/efi_secureboot.c @@ -0,0 +1,56 @@ +// SPDX-License-Identifier: GPL-1.0+ +/* + * Copyright (C) 2018 IBM Corporation + */ +#include +#include +#include + +#ifndef arch_efi_boot_mode +#define arch_efi_boot_mode efi_secureboot_mode_unset +#endif + +static enum efi_secureboot_mode get_sb_mode(void) +{ + enum efi_secureboot_mode mode; + + if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) { + pr_info("integrity: secureboot mode unknown, no efi\n"); + return efi_secureboot_mode_unknown; + } + + mode = efi_get_secureboot_mode(efi.get_variable); + if (mode == efi_secureboot_mode_disabled) + pr_info("integrity: secureboot mode disabled\n"); + else if (mode == efi_secureboot_mode_unknown) + pr_info("integrity: secureboot mode unknown\n"); + else + pr_info("integrity: secureboot mode enabled\n"); + return mode; +} + +/* + * Query secure boot status + * + * Note don't call this function too early e.g. in __setup hook otherwise the + * kernel may hang when calling efi_get_secureboot_mode. + * + */ +bool arch_get_secureboot(void) +{ + static enum efi_secureboot_mode sb_mode; + static bool initialized; + + if (!initialized && efi_enabled(EFI_BOOT)) { + sb_mode = arch_efi_boot_mode; + + if (sb_mode == efi_secureboot_mode_unset) + sb_mode = get_sb_mode(); + initialized = true; + } + + if (sb_mode == efi_secureboot_mode_enabled) + return true; + else + return false; +} -- cgit v1.3.1