From: Rick Edgecombe <rick.p.edgecombe@intel.com> To: Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@redhat.com> Cc: linux-kernel@vger.kernel.org, x86@kernel.org, hpa@zytor.com, Thomas Gleixner <tglx@linutronix.de>, Borislav Petkov <bp@alien8.de>, Nadav Amit <nadav.amit@gmail.com>, Dave Hansen <dave.hansen@linux.intel.com>, Peter Zijlstra <peterz@infradead.org>, linux_dti@icloud.com, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, akpm@linux-foundation.org, kernel-hardening@lists.openwall.com, linux-mm@kvack.org, will.deacon@arm.com, ard.biesheuvel@linaro.org, kristen@linux.intel.com, deneen.t.dock@intel.com, Rick Edgecombe <rick.p.edgecombe@intel.com>, Masami Hiramatsu <mhiramat@kernel.org> Subject: [PATCH v2 19/20] x86/kprobes: Use vmalloc special flag Date: Mon, 28 Jan 2019 16:34:21 -0800 Message-ID: <20190129003422.9328-20-rick.p.edgecombe@intel.com> (raw) In-Reply-To: <20190129003422.9328-1-rick.p.edgecombe@intel.com> Use new flag VM_HAS_SPECIAL_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@kernel.org> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.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 fac692e36833..f2fab35bcb82 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 == NULL) return NULL; + set_vm_special(page); /* * First make the page read-only, and then 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 then 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
next prev parent reply index Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-01-29 0:34 [PATCH v2 00/20] Merge text_poke fixes and executable lockdowns Rick Edgecombe 2019-01-29 0:34 ` [PATCH v2 01/20] Fix "x86/alternatives: Lockdep-enforce text_mutex in text_poke*()" Rick Edgecombe 2019-01-29 0:34 ` [PATCH v2 02/20] x86/jump_label: Use text_poke_early() during early init Rick Edgecombe 2019-01-29 0:34 ` [PATCH v2 03/20] x86/mm: temporary mm struct Rick Edgecombe 2019-01-31 11:29 ` Borislav Petkov 2019-01-31 22:19 ` Nadav Amit 2019-02-01 0:08 ` Borislav Petkov 2019-02-01 0:25 ` Nadav Amit 2019-02-04 14:28 ` Borislav Petkov 2019-01-29 0:34 ` [PATCH v2 04/20] fork: provide a function for copying init_mm Rick Edgecombe 2019-02-05 8:53 ` Borislav Petkov 2019-02-05 9:03 ` Nadav Amit 2019-01-29 0:34 ` [PATCH v2 05/20] x86/alternative: initializing temporary mm for patching Rick Edgecombe 2019-02-05 9:18 ` Borislav Petkov 2019-02-11 0:39 ` Nadav Amit 2019-02-11 5:18 ` Andy Lutomirski 2019-02-11 18:04 ` Nadav Amit 2019-02-11 19:07 ` Andy Lutomirski 2019-02-11 19:18 ` Nadav Amit 2019-02-11 22:47 ` Andy Lutomirski 2019-02-12 18:23 ` Nadav Amit 2019-01-29 0:34 ` [PATCH v2 06/20] x86/alternative: use temporary mm for text poking Rick Edgecombe 2019-02-05 9:58 ` Borislav Petkov 2019-02-05 11:31 ` Peter Zijlstra 2019-02-05 12:35 ` Borislav Petkov 2019-02-05 13:25 ` Peter Zijlstra 2019-02-05 17:54 ` Nadav Amit 2019-02-05 13:29 ` Peter Zijlstra 2019-01-29 0:34 ` [PATCH v2 07/20] x86/kgdb: avoid redundant comparison of patched code Rick Edgecombe 2019-01-29 0:34 ` [PATCH v2 08/20] x86/ftrace: set trampoline pages as executable Rick Edgecombe 2019-01-29 0:34 ` [PATCH v2 09/20] x86/kprobes: instruction pages initialization enhancements Rick Edgecombe 2019-02-11 18:22 ` Borislav Petkov 2019-02-11 19:36 ` Nadav Amit 2019-01-29 0:34 ` [PATCH v2 10/20] x86: avoid W^X being broken during modules loading Rick Edgecombe 2019-02-11 18:29 ` Borislav Petkov 2019-02-11 18:45 ` Nadav Amit 2019-02-11 19:01 ` Borislav Petkov 2019-02-11 19:09 ` Nadav Amit 2019-02-11 19:10 ` Borislav Petkov 2019-02-11 19:27 ` Nadav Amit 2019-02-11 19:42 ` Borislav Petkov 2019-02-11 20:32 ` Nadav Amit 2019-03-07 15:10 ` [PATCH] x86/cpufeature: Remove __pure attribute to _static_cpu_has() Borislav Petkov 2019-03-07 16:43 ` hpa 2019-03-07 17:02 ` Borislav Petkov 2019-03-07 7:29 ` [PATCH v2 10/20] x86: avoid W^X being broken during modules loading Borislav Petkov 2019-03-07 16:53 ` hpa 2019-03-07 17:06 ` Borislav Petkov 2019-03-07 20:02 ` Andy Lutomirski 2019-03-07 20:25 ` Borislav Petkov 2019-01-29 0:34 ` [PATCH v2 11/20] x86/jump-label: remove support for custom poker Rick Edgecombe 2019-02-11 18:37 ` Borislav Petkov 2019-01-29 0:34 ` [PATCH v2 12/20] x86/alternative: Remove the return value of text_poke_*() Rick Edgecombe 2019-01-29 0:34 ` [PATCH v2 13/20] Add set_alias_ function and x86 implementation Rick Edgecombe 2019-02-11 19:09 ` Borislav Petkov 2019-02-11 19:27 ` Edgecombe, Rick P 2019-02-11 22:59 ` Andy Lutomirski 2019-02-12 0:01 ` Edgecombe, Rick P 2019-01-29 0:34 ` [PATCH v2 14/20] mm: Make hibernate handle unmapped pages Rick Edgecombe 2019-02-19 11:04 ` Borislav Petkov 2019-02-19 21:28 ` Edgecombe, Rick P 2019-02-20 16:07 ` Borislav Petkov 2019-01-29 0:34 ` [PATCH v2 15/20] vmalloc: New flags for safe vfree on special perms Rick Edgecombe 2019-02-19 12:48 ` Borislav Petkov 2019-02-19 19:42 ` Edgecombe, Rick P 2019-02-20 16:14 ` Borislav Petkov 2019-01-29 0:34 ` [PATCH v2 16/20] modules: Use vmalloc special flag Rick Edgecombe 2019-01-29 0:34 ` [PATCH v2 17/20] bpf: " Rick Edgecombe 2019-01-29 0:34 ` [PATCH v2 18/20] x86/ftrace: " Rick Edgecombe 2019-01-29 0:34 ` Rick Edgecombe [this message] 2019-01-29 0:34 ` [PATCH v2 20/20] x86/alternative: comment about module removal races Rick Edgecombe
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