1 // SPDX-License-Identifier: GPL-2.0-only
13 #include <linux/mm.h>
108 	[END_OF_SPACE_NR]	= { -1,			NULL }
144 	[END_OF_SPACE_NR]	= { -1,			NULL }
231 	npages = (addr - st->start_address) / PAGE_SIZE;  in note_wx()
238 	if (pcibios_enabled && st->start_address >= PAGE_OFFSET + BIOS_BEGIN &&  in note_wx()
240 		pr_warn_once("x86/mm: PCI BIOS W+X mapping %lu pages\n", npages);  in note_wx()
245 	st->wx_pages += npages;  in note_wx()
247 		  "x86/mm: Found insecure W+X mapping at address %pS\n",  in note_wx()
248 		  (void *)st->start_address);  in note_wx()
258 		pgprotval_t higher_prot = st->prot_levels[level - 1];  in effective_prot()
266 	st->prot_levels[level] = effective;  in effective_prot()
281 	struct seq_file *m = st->seq;  in note_page()
287 		new_eff = st->prot_levels[level];  in note_page()
294 	cur = st->current_prot;  in note_page()
295 	eff = st->effective_prot;  in note_page()
297 	if (st->level == -1) {  in note_page()
299 		st->current_prot = new_prot;  in note_page()
300 		st->effective_prot = new_eff;  in note_page()
301 		st->level = level;  in note_page()
302 		st->marker = address_markers;  in note_page()
303 		st->lines = 0;  in note_page()
304 		pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",  in note_page()
305 				   st->marker->name);  in note_page()
306 	} else if (new_prot != cur || new_eff != eff || level != st->level ||  in note_page()
307 		   addr >= st->marker[1].start_address) {  in note_page()
310 		int width = sizeof(unsigned long) * 2;  in note_page()  local
312 		if (st->check_wx && (eff & _PAGE_RW) && !(eff & _PAGE_NX))  in note_page()
318 		if (!st->marker->max_lines ||  in note_page()
319 		    st->lines < st->marker->max_lines) {  in note_page()
320 			pt_dump_seq_printf(m, st->to_dmesg,  in note_page()
321 					   "0x%0*lx-0x%0*lx   ",  in note_page()
322 					   width, st->start_address,  in note_page()
323 					   width, addr);  in note_page()
325 			delta = addr - st->start_address;  in note_page()
330 			pt_dump_cont_printf(m, st->to_dmesg, "%9lu%c ",  in note_page()
332 			printk_prot(m, st->current_prot, st->level,  in note_page()
333 				    st->to_dmesg);  in note_page()
335 		st->lines++;  in note_page()
342 		if (addr >= st->marker[1].start_address) {  in note_page()
343 			if (st->marker->max_lines &&  in note_page()
344 			    st->lines > st->marker->max_lines) {  in note_page()
346 					st->lines - st->marker->max_lines;  in note_page()
347 				pt_dump_seq_printf(m, st->to_dmesg,  in note_page()
352 			st->marker++;  in note_page()
353 			st->lines = 0;  in note_page()
354 			pt_dump_seq_printf(m, st->to_dmesg, "---[ %s ]---\n",  in note_page()
355 					   st->marker->name);  in note_page()
358 		st->start_address = addr;  in note_page()
359 		st->current_prot = new_prot;  in note_page()
360 		st->effective_prot = new_eff;  in note_page()
361 		st->level = level;  in note_page()
366 				       struct mm_struct *mm, pgd_t *pgd,  in ptdump_walk_pgd_level_core()  argument
385 		.level = -1,  in ptdump_walk_pgd_level_core()
391 	ptdump_walk_pgd(&st.ptdump, mm, pgd);  in ptdump_walk_pgd_level_core()
396 		pr_info("x86/mm: Checked W+X mappings: FAILED, %lu W+X pages found.\n",  in ptdump_walk_pgd_level_core()
399 		pr_info("x86/mm: Checked W+X mappings: passed, no W+X pages found.\n");  in ptdump_walk_pgd_level_core()
402 void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm)  in ptdump_walk_pgd_level()  argument
404 	ptdump_walk_pgd_level_core(m, mm, mm->pgd, false, true);  in ptdump_walk_pgd_level()
407 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm,  in ptdump_walk_pgd_level_debugfs()  argument
410 	pgd_t *pgd = mm->pgd;  in ptdump_walk_pgd_level_debugfs()
415 	ptdump_walk_pgd_level_core(m, mm, pgd, false, false);  in ptdump_walk_pgd_level_debugfs()
428 	pr_info("x86/mm: Checking user space page tables\n");  in ptdump_walk_user_pgd_level_checkwx()
442 	 * Various markers are not compile-time constants, so assign them  in pt_dump_init()