JFIF$        dd7 

Viewing File: /usr/src/kernels/5.14.0-570.30.1.el9_6.x86_64/arch/x86/include/asm/kfence.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * x86 KFENCE support.
 *
 * Copyright (C) 2020, Google LLC.
 */

#ifndef _ASM_X86_KFENCE_H
#define _ASM_X86_KFENCE_H

#ifndef MODULE

#include <linux/bug.h>
#include <linux/kfence.h>

#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/set_memory.h>
#include <asm/tlbflush.h>

/* Force 4K pages for __kfence_pool. */
static inline bool arch_kfence_init_pool(void)
{
	unsigned long addr;

	for (addr = (unsigned long)__kfence_pool; is_kfence_address((void *)addr);
	     addr += PAGE_SIZE) {
		unsigned int level;

		if (!lookup_address(addr, &level))
			return false;

		if (level != PG_LEVEL_4K)
			set_memory_4k(addr, 1);
	}

	return true;
}

/* Protect the given page and flush TLB. */
static inline bool kfence_protect_page(unsigned long addr, bool protect)
{
	unsigned int level;
	pte_t *pte = lookup_address(addr, &level);

	if (WARN_ON(!pte || level != PG_LEVEL_4K))
		return false;

	/*
	 * We need to avoid IPIs, as we may get KFENCE allocations or faults
	 * with interrupts disabled. Therefore, the below is best-effort, and
	 * does not flush TLBs on all CPUs. We can tolerate some inaccuracy;
	 * lazy fault handling takes care of faults after the page is PRESENT.
	 */

	if (protect)
		set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_PRESENT));
	else
		set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT));

	/*
	 * Flush this CPU's TLB, assuming whoever did the allocation/free is
	 * likely to continue running on this CPU.
	 */
	preempt_disable();
	flush_tlb_one_kernel(addr);
	preempt_enable();
	return true;
}

#endif /* !MODULE */

#endif /* _ASM_X86_KFENCE_H */
Back to Directory  nL+D550H?Mx ,D"v]qv;6*Zqn)ZP0!1 A "#a$2Qr D8 a Ri[f\mIykIw0cuFcRı?lO7к_f˓[C$殷WF<_W ԣsKcëIzyQy/_LKℂ;C",pFA:/]=H  ~,ls/9ć:[=/#f;)x{ٛEQ )~ =𘙲r*2~ a _V=' kumFD}KYYC)({ *g&f`툪ry`=^cJ.I](*`wq1dđ#̩͑0;H]u搂@:~וKL Nsh}OIR*8:2 !lDJVo(3=M(zȰ+i*NAr6KnSl)!JJӁ* %݉?|D}d5:eP0R;{$X'xF@.ÊB {,WJuQɲRI;9QE琯62fT.DUJ;*cP A\ILNj!J۱+O\͔]ޒS߼Jȧc%ANolՎprULZԛerE2=XDXgVQeӓk yP7U*omQIs,K`)6\G3t?pgjrmۛجwluGtfh9uyP0D;Uڽ"OXlif$)&|ML0Zrm1[HXPlPR0'G=i2N+0e2]]9VTPO׮7h(F*癈'=QVZDF,d߬~TX G[`le69CR(!S2!P <0x<!1AQ "Raq02Br#SCTb ?Ζ"]mH5WR7k.ۛ!}Q~+yԏz|@T20S~Kek *zFf^2X*(@8r?CIuI|֓>^ExLgNUY+{.RѪ τV׸YTD I62'8Y27'\TP.6d&˦@Vqi|8-OΕ]ʔ U=TL8=;6c| !qfF3aů&~$l}'NWUs$Uk^SV:U# 6w++s&r+nڐ{@29 gL u"TÙM=6(^"7r}=6YݾlCuhquympǦ GjhsǜNlɻ}o7#S6aw4!OSrD57%|?x>L |/nD6?/8w#[)L7+6〼T ATg!%5MmZ/c-{1_Je"|^$'O&ޱմTrb$w)R$& N1EtdU3Uȉ1pM"N*(DNyd96.(jQ)X 5cQɎMyW?Q*!R>6=7)Xj5`J]e8%t!+'!1Q5 !1 AQaqё#2"0BRb?Gt^## .llQT $v,,m㵜5ubV =sY+@d{N! dnO<.-B;_wJt6;QJd.Qc%p{ 1,sNDdFHI0ГoXшe黅XۢF:)[FGXƹ/w_cMeD,ʡcc.WDtA$j@:) -# u c1<@ۗ9F)KJ-hpP]_x[qBlbpʖw q"LFGdƶ*s+ډ_Zc"?%t[IP 6J]#=ɺVvvCGsGh1 >)6|ey?Lӣm,4GWUi`]uJVoVDG< SB6ϏQ@ TiUlyOU0kfV~~}SZ@*WUUi##; s/[=!7}"WN]'(L! ~y5g9T̅JkbM' +s:S +B)v@Mj e Cf jE 0Y\QnzG1д~Wo{T9?`Rmyhsy3!HAD]mc1~2LSu7xT;j$`}4->L#vzŏILS ֭T{rjGKC;bpU=-`BsK.SFw4Mq]ZdHS0)tLg