The patch titled
pagemap: require aligned-length, non-null reads of /proc/pid/pagemap
has been added to the -mm tree. Its filename is
pagemap-require-aligned-length-non-null-reads-of-proc-pid-pagemap.patch
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------------------------------------------------------
Subject: pagemap: require aligned-length, non-null reads of /proc/pid/pagemap
From: Vitaly Mayatskikh <v.mayatskih@xxxxxxxxx>
The intention of commit aae8679b0ebcaa92f99c1c3cb0cd651594a43915
("pagemap: fix bug in add_to_pagemap, require aligned-length reads of
/proc/pid/pagemap") was to force reads of /proc/pid/pagemap to be a
multiple of 8 bytes, but now it allows to read 0 bytes, which actually
puts some data to user's buffer. According to POSIX, if count is zero,
read() should return zero and has no other results.
Signed-off-by: Vitaly Mayatskikh <v.mayatskih@xxxxxxxxx>
Cc: Thomas Tuttle <ttuttle@xxxxxxxxxx>
Cc: Matt Mackall <mpm@xxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/task_mmu.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN fs/proc/task_mmu.c~pagemap-require-aligned-length-non-null-reads-of-proc-pid-pagemap fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~pagemap-require-aligned-length-non-null-reads-of-proc-pid-pagemap
+++ a/fs/proc/task_mmu.c
@@ -665,6 +665,10 @@ static ssize_t pagemap_read(struct file
goto out_task;
ret = 0;
+
+ if (!count)
+ goto out_task;
+
mm = get_task_mm(task);
if (!mm)
goto out_task;
_
Patches currently in -mm which might be from v.mayatskih@xxxxxxxxx are
pagemap-require-aligned-length-non-null-reads-of-proc-pid-pagemap.patch
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