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Subject[PATCH 2/3] Fix /proc/pid/pagemap header copy to userspace
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Earlier code relied on a broken length calculation copy
/proc/pid/pagemap header data to userspace. This fix
correctly calls the add_to_pagemap routine after the header data is
set to copy results to userspace in a sane fashion.

Signed-off-by: Dave Boutcher <boutcher@cs.umn.edu>
---
fs/proc/task_mmu.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index b2baeab..1f78cb4 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -657,11 +657,11 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
pm.out = buf;

if (svpfn == -1) {
- add_to_pagemap(pm.next, 0, &pm);
((char *)page)[0] = (ntohl(1) != 1);
((char *)page)[1] = PAGE_SHIFT;
((char *)page)[2] = sizeof(unsigned long);
((char *)page)[3] = sizeof(unsigned long);
+ add_to_pagemap(pm.next, page[0], &pm);
}

down_read(&mm->mmap_sem);
--
1.4.4.2
-
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