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 --- fs/proc/uptime.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 fs/proc/uptime.c (limited to 'fs/proc/uptime.c') diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c new file mode 100644 index 000000000..433aa947c --- /dev/null +++ b/fs/proc/uptime.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include +#include "internal.h" + +static int uptime_proc_show(struct seq_file *m, void *v) +{ + struct timespec64 uptime; + struct timespec64 idle; + u64 idle_nsec; + u32 rem; + int i; + + idle_nsec = 0; + for_each_possible_cpu(i) + idle_nsec += kcpustat_field(CPUTIME_IDLE, i); + + ktime_get_boottime_ts64(&uptime); + timens_add_boottime(&uptime); + + idle.tv_sec = div_u64_rem(idle_nsec, NSEC_PER_SEC, &rem); + idle.tv_nsec = rem; + seq_printf(m, "%lu.%02lu %lu.%02lu\n", + (unsigned long) uptime.tv_sec, + (uptime.tv_nsec / (NSEC_PER_SEC / 100)), + (unsigned long) idle.tv_sec, + (idle.tv_nsec / (NSEC_PER_SEC / 100))); + return 0; +} + +static int __init proc_uptime_init(void) +{ + struct proc_dir_entry *pde; + + pde = proc_create_single("uptime", 0, NULL, uptime_proc_show); + pde_make_permanent(pde); + return 0; +} +fs_initcall(proc_uptime_init); -- cgit v1.3.1