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x86/kprobes: Use vmalloc special flag 

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.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <akpm@linux-foundation.org>
Cc: <ard.biesheuvel@linaro.org>
Cc: <deneen.t.dock@intel.com>
Cc: <kernel-hardening@lists.openwall.com>
Cc: <kristen@linux.intel.com>
Cc: <linux_dti@icloud.com>
Cc: <will.deacon@arm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190426001143.4983-21-namit@vmware.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
hifive-unleashed-5.2
Rick Edgecombe 2019-04-25 17:11:40 -07:00 committed by Ingo Molnar
parent 7fdfe1e40b
commit 241a1f2238
1 changed files with 1 additions and 6 deletions
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7
arch/x86/kernel/kprobes/core.c
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@ -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);
}