The patch titled
Subject: fs/proc/kcore.c: fix invalid memory access in multi-page read optimization
has been added to the -mm tree. Its filename is
proc-kcore-fix-invalid-memory-access-in-multi-page-read-optimization-v3.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-kcore-fix-invalid-memory-access-in-multi-page-read-optimization-v3.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/proc-kcore-fix-invalid-memory-access-in-multi-page-read-optimization-v3.patch
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------------------------------------------------------
From: Dominique Martinet <asmadeus@xxxxxxxxxxxxx>
Subject: fs/proc/kcore.c: fix invalid memory access in multi-page read optimization
The 'm' kcore_list item could point to kclist_head, and it is incorrect to
look at m->addr / m->size in this case.
There is no choice but to run through the list of entries for every
address if we did not find any entry in the previous iteration
Reset 'm' to NULL in that case at Omar Sandoval's suggestion.
Link: http://lkml.kernel.org/r/1536100702-28706-1-git-send-email-asmadeus@xxxxxxxxxxxxx
Fixes: bf991c2231117 ("proc/kcore: optimize multiple page reads")
Signed-off-by: Dominique Martinet <asmadeus@xxxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Omar Sandoval <osandov@xxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Bhupesh Sharma <bhsharma@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/kcore.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/proc/kcore.c~proc-kcore-fix-invalid-memory-access-in-multi-page-read-optimization-v3
+++ a/fs/proc/kcore.c
@@ -464,6 +464,7 @@ read_kcore(struct file *file, char __use
ret = -EFAULT;
goto out;
}
+ m = NULL;
} else if (m->type == KCORE_VMALLOC) {
vread(buf, (char *)start, tsz);
/* we have to zero-fill user buffer even if no read */
_
Patches currently in -mm which might be from asmadeus@xxxxxxxxxxxxx are
proc-kcore-fix-invalid-memory-access-in-multi-page-read-optimization-v3.patch
