linux-kernel - [PATCH v1 1/3] perf: MAP_EXECUTABLE does not indicate VM

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Date:   Wed, 21 Apr 2021 11:34:51 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     David Hildenbrand <david@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Mike Rapoport <rppt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Kevin Brodsky <Kevin.Brodsky@....com>,
        Michal Hocko <mhocko@...e.com>,
        Feng Tang <feng.tang@...el.com>,
        Don Zickus <dzickus@...hat.com>, x86@...nel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH v1 1/3] perf: MAP_EXECUTABLE does not indicate VM_MAYEXEC

Before commit e9714acf8c43 ("mm: kill vma flag VM_EXECUTABLE and
mm->num_exe_file_vmas"), VM_EXECUTABLE indicated MAP_EXECUTABLE.
MAP_EXECUTABLE is nowadays essentially ignored by the kernel and does
not relate to VM_MAYEXEC.

Fixes: f972eb63b100 ("perf: Pass protection and flags bits through mmap2 interface")
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 kernel/events/core.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 03db40f6cba9..3dfd463f1831 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8186,8 +8186,6 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
 
 	if (vma->vm_flags & VM_DENYWRITE)
 		flags |= MAP_DENYWRITE;
-	if (vma->vm_flags & VM_MAYEXEC)
-		flags |= MAP_EXECUTABLE;
 	if (vma->vm_flags & VM_LOCKED)
 		flags |= MAP_LOCKED;
 	if (is_vm_hugetlb_page(vma))
-- 
2.30.2