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/meminfo.c | 188 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 188 insertions(+) create mode 100644 fs/proc/meminfo.c (limited to 'fs/proc/meminfo.c') diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c new file mode 100644 index 000000000..b2813ff13 --- /dev/null +++ b/fs/proc/meminfo.c @@ -0,0 +1,188 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#ifdef CONFIG_CMA +#include +#endif +#include +#include +#include "internal.h" + +void __attribute__((weak)) arch_report_meminfo(struct seq_file *m) +{ +} + +static void show_val_kb(struct seq_file *m, const char *s, unsigned long num) +{ + seq_put_decimal_ull_width(m, s, num << (PAGE_SHIFT - 10), 8); + seq_write(m, " kB\n", 4); +} + +static int meminfo_proc_show(struct seq_file *m, void *v) +{ + struct sysinfo i; + unsigned long committed; + long cached; + long available; + unsigned long pages[NR_LRU_LISTS]; + unsigned long sreclaimable, sunreclaim; + int lru; + + si_meminfo(&i); + si_swapinfo(&i); + committed = vm_memory_committed(); + + cached = global_node_page_state(NR_FILE_PAGES) - + total_swapcache_pages() - i.bufferram; + if (cached < 0) + cached = 0; + + for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++) + pages[lru] = global_node_page_state(NR_LRU_BASE + lru); + + available = si_mem_available(); + sreclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B); + sunreclaim = global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B); + + show_val_kb(m, "MemTotal: ", i.totalram); + show_val_kb(m, "MemFree: ", i.freeram); + show_val_kb(m, "MemAvailable: ", available); + show_val_kb(m, "Buffers: ", i.bufferram); + show_val_kb(m, "Cached: ", cached); + show_val_kb(m, "SwapCached: ", total_swapcache_pages()); + show_val_kb(m, "Active: ", pages[LRU_ACTIVE_ANON] + + pages[LRU_ACTIVE_FILE]); + show_val_kb(m, "Inactive: ", pages[LRU_INACTIVE_ANON] + + pages[LRU_INACTIVE_FILE]); + show_val_kb(m, "Active(anon): ", pages[LRU_ACTIVE_ANON]); + show_val_kb(m, "Inactive(anon): ", pages[LRU_INACTIVE_ANON]); + show_val_kb(m, "Active(file): ", pages[LRU_ACTIVE_FILE]); + show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]); + show_val_kb(m, "Unevictable: ", pages[LRU_UNEVICTABLE]); + show_val_kb(m, "Mlocked: ", global_zone_page_state(NR_MLOCK)); + +#ifdef CONFIG_HIGHMEM + show_val_kb(m, "HighTotal: ", i.totalhigh); + show_val_kb(m, "HighFree: ", i.freehigh); + show_val_kb(m, "LowTotal: ", i.totalram - i.totalhigh); + show_val_kb(m, "LowFree: ", i.freeram - i.freehigh); +#endif + +#ifndef CONFIG_MMU + show_val_kb(m, "MmapCopy: ", + (unsigned long)atomic_long_read(&mmap_pages_allocated)); +#endif + + show_val_kb(m, "SwapTotal: ", i.totalswap); + show_val_kb(m, "SwapFree: ", i.freeswap); +#ifdef CONFIG_ZSWAP + show_val_kb(m, "Zswap: ", zswap_total_pages()); + seq_printf(m, "Zswapped: %8lu kB\n", + (unsigned long)atomic_long_read(&zswap_stored_pages) << + (PAGE_SHIFT - 10)); +#endif + show_val_kb(m, "Dirty: ", + global_node_page_state(NR_FILE_DIRTY)); + show_val_kb(m, "Writeback: ", + global_node_page_state(NR_WRITEBACK)); + show_val_kb(m, "AnonPages: ", + global_node_page_state(NR_ANON_MAPPED)); + show_val_kb(m, "Mapped: ", + global_node_page_state(NR_FILE_MAPPED)); + show_val_kb(m, "Shmem: ", i.sharedram); + show_val_kb(m, "KReclaimable: ", sreclaimable + + global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE)); + show_val_kb(m, "Slab: ", sreclaimable + sunreclaim); + show_val_kb(m, "SReclaimable: ", sreclaimable); + show_val_kb(m, "SUnreclaim: ", sunreclaim); + seq_printf(m, "KernelStack: %8lu kB\n", + global_node_page_state(NR_KERNEL_STACK_KB)); +#ifdef CONFIG_SHADOW_CALL_STACK + seq_printf(m, "ShadowCallStack:%8lu kB\n", + global_node_page_state(NR_KERNEL_SCS_KB)); +#endif + show_val_kb(m, "PageTables: ", + global_node_page_state(NR_PAGETABLE)); + show_val_kb(m, "SecPageTables: ", + global_node_page_state(NR_SECONDARY_PAGETABLE)); + + show_val_kb(m, "NFS_Unstable: ", 0); + show_val_kb(m, "Bounce: ", 0); + show_val_kb(m, "WritebackTmp: ", 0); + show_val_kb(m, "CommitLimit: ", vm_commit_limit()); + show_val_kb(m, "Committed_AS: ", committed); + seq_printf(m, "VmallocTotal: %8lu kB\n", + (unsigned long)VMALLOC_TOTAL >> 10); + show_val_kb(m, "VmallocUsed: ", + global_node_page_state(NR_VMALLOC)); + show_val_kb(m, "VmallocChunk: ", 0ul); + show_val_kb(m, "Percpu: ", pcpu_nr_pages()); + + memtest_report_meminfo(m); + +#ifdef CONFIG_MEMORY_FAILURE + seq_printf(m, "HardwareCorrupted: %5lu kB\n", + atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)); +#endif + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + show_val_kb(m, "AnonHugePages: ", + global_node_page_state(NR_ANON_THPS)); + show_val_kb(m, "ShmemHugePages: ", + global_node_page_state(NR_SHMEM_THPS)); + show_val_kb(m, "ShmemPmdMapped: ", + global_node_page_state(NR_SHMEM_PMDMAPPED)); + show_val_kb(m, "FileHugePages: ", + global_node_page_state(NR_FILE_THPS)); + show_val_kb(m, "FilePmdMapped: ", + global_node_page_state(NR_FILE_PMDMAPPED)); +#endif + +#ifdef CONFIG_CMA + show_val_kb(m, "CmaTotal: ", totalcma_pages); + show_val_kb(m, "CmaFree: ", + global_zone_page_state(NR_FREE_CMA_PAGES)); +#endif + +#ifdef CONFIG_UNACCEPTED_MEMORY + show_val_kb(m, "Unaccepted: ", + global_zone_page_state(NR_UNACCEPTED)); +#endif + show_val_kb(m, "Balloon: ", + global_node_page_state(NR_BALLOON_PAGES)); + + show_val_kb(m, "GPUActive: ", + global_node_page_state(NR_GPU_ACTIVE)); + + show_val_kb(m, "GPUReclaim: ", + global_node_page_state(NR_GPU_RECLAIM)); + + hugetlb_report_meminfo(m); + + arch_report_meminfo(m); + + return 0; +} + +static int __init proc_meminfo_init(void) +{ + struct proc_dir_entry *pde; + + pde = proc_create_single("meminfo", 0, NULL, meminfo_proc_show); + pde_make_permanent(pde); + return 0; +} +fs_initcall(proc_meminfo_init); -- cgit v1.3.1