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Message-Id: <20190426232303.28381-22-nadav.amit@gmail.com>
Date: Fri, 26 Apr 2019 16:23:00 -0700
From: nadav.amit@...il.com
To: Peter Zijlstra <peterz@...radead.org>,
Borislav Petkov <bp@...en8.de>,
Andy Lutomirski <luto@...nel.org>,
Ingo Molnar <mingo@...hat.com>
Cc: linux-kernel@...r.kernel.org,
x86@...nel.org,
hpa@...or.com,
Thomas Gleixner <tglx@...utronix.de>,
Nadav Amit <nadav.amit@...il.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
linux_dti@...oud.com,
linux-integrity@...r.kernel.org,
linux-security-module@...r.kernel.org,
akpm@...ux-foundation.org,
kernel-hardening@...ts.openwall.com,
linux-mm@...ck.org,
will.deacon@....com,
ard.biesheuvel@...aro.org,
kristen@...ux.intel.com,
deneen.t.dock@...el.com,
Rick Edgecombe <rick.p.edgecombe@...el.com>,
Masami Hiramatsu <mhiramat@...nel.org>
Subject: [PATCH v6 21/24] x86/kprobes: Use vmalloc special flag
From: Rick Edgecombe <rick.p.edgecombe@...el.com>
Use new flag VM_FLUSH_RESET_PERMS for handling freeing of special
permissioned memory in vmalloc and remove places where memory was set NX
and RW before freeing which is no longer needed.
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
---
arch/x86/kernel/kprobes/core.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
index 1591852d3ac4..136695e4434a 100644
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -434,6 +434,7 @@ void *alloc_insn_page(void)
if (!page)
return NULL;
+ set_vm_flush_reset_perms(page);
/*
* First make the page read-only, and only then make it executable to
* prevent it from being W+X in between.
@@ -452,12 +453,6 @@ void *alloc_insn_page(void)
/* Recover page to RW mode before releasing it */
void free_insn_page(void *page)
{
- /*
- * First make the page non-executable, and only then make it writable to
- * prevent it from being W+X in between.
- */
- set_memory_nx((unsigned long)page, 1);
- set_memory_rw((unsigned long)page, 1);
module_memfree(page);
}
--
2.17.1
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