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Subject[tip:perf/core] perf: Pass protection and flags bits through mmap2 interface
Commit-ID:  f972eb63b1003fae68d7b7e9b674d4ba5db681c2
Gitweb: http://git.kernel.org/tip/f972eb63b1003fae68d7b7e9b674d4ba5db681c2
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Mon, 19 May 2014 15:13:47 -0400
Committer: Jiri Olsa <jolsa@kernel.org>
CommitDate: Mon, 9 Jun 2014 12:21:04 +0200

perf: Pass protection and flags bits through mmap2 interface

The mmap2 interface was missing the protection and flags bits needed to
accurately determine if a mmap memory area was shared or private and
if it was readable or not.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
[tweaked patch to compile and wrote changelog]
Signed-off-by: Don Zickus <dzickus@redhat.com>
Link: http://lkml.kernel.org/r/1400526833-141779-2-git-send-email-dzickus@redhat.com
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
include/uapi/linux/perf_event.h | 1 +
kernel/events/core.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 34 insertions(+)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 5312fae..9269de2 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -705,6 +705,7 @@ enum perf_event_type {
* u32 min;
* u64 ino;
* u64 ino_generation;
+ * u32 prot, flags;
* char filename[];
* struct sample_id sample_id;
* };
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 7da5e56..eea1955 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -40,6 +40,7 @@
#include <linux/mm_types.h>
#include <linux/cgroup.h>
#include <linux/module.h>
+#include <linux/mman.h>

#include "internal.h"

@@ -5127,6 +5128,7 @@ struct perf_mmap_event {
int maj, min;
u64 ino;
u64 ino_generation;
+ u32 prot, flags;

struct {
struct perf_event_header header;
@@ -5168,6 +5170,8 @@ static void perf_event_mmap_output(struct perf_event *event,
mmap_event->event_id.header.size += sizeof(mmap_event->min);
mmap_event->event_id.header.size += sizeof(mmap_event->ino);
mmap_event->event_id.header.size += sizeof(mmap_event->ino_generation);
+ mmap_event->event_id.header.size += sizeof(mmap_event->prot);
+ mmap_event->event_id.header.size += sizeof(mmap_event->flags);
}

perf_event_header__init_id(&mmap_event->event_id.header, &sample, event);
@@ -5186,6 +5190,8 @@ static void perf_event_mmap_output(struct perf_event *event,
perf_output_put(&handle, mmap_event->min);
perf_output_put(&handle, mmap_event->ino);
perf_output_put(&handle, mmap_event->ino_generation);
+ perf_output_put(&handle, mmap_event->prot);
+ perf_output_put(&handle, mmap_event->flags);
}

__output_copy(&handle, mmap_event->file_name,
@@ -5204,6 +5210,7 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
struct file *file = vma->vm_file;
int maj = 0, min = 0;
u64 ino = 0, gen = 0;
+ u32 prot = 0, flags = 0;
unsigned int size;
char tmp[16];
char *buf = NULL;
@@ -5234,6 +5241,28 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
gen = inode->i_generation;
maj = MAJOR(dev);
min = MINOR(dev);
+
+ if (vma->vm_flags & VM_READ)
+ prot |= PROT_READ;
+ if (vma->vm_flags & VM_WRITE)
+ prot |= PROT_WRITE;
+ if (vma->vm_flags & VM_EXEC)
+ prot |= PROT_EXEC;
+
+ if (vma->vm_flags & VM_MAYSHARE)
+ flags = MAP_SHARED;
+ else
+ flags = MAP_PRIVATE;
+
+ 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 (vma->vm_flags & VM_HUGETLB)
+ flags |= MAP_HUGETLB;
+
goto got_name;
} else {
name = (char *)arch_vma_name(vma);
@@ -5274,6 +5303,8 @@ got_name:
mmap_event->min = min;
mmap_event->ino = ino;
mmap_event->ino_generation = gen;
+ mmap_event->prot = prot;
+ mmap_event->flags = flags;

if (!(vma->vm_flags & VM_EXEC))
mmap_event->event_id.header.misc |= PERF_RECORD_MISC_MMAP_DATA;
@@ -5314,6 +5345,8 @@ void perf_event_mmap(struct vm_area_struct *vma)
/* .min (attr_mmap2 only) */
/* .ino (attr_mmap2 only) */
/* .ino_generation (attr_mmap2 only) */
+ /* .prot (attr_mmap2 only) */
+ /* .flags (attr_mmap2 only) */
};

perf_event_mmap_event(&mmap_event);

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