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[PATCH] /fs/proc/: 'larger than buffer size' memory accessed by clear_user()

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Address a potential 'larger than buffer size' memory access by
clear_user().  Without this patch, this call to clear_user() can attempt to
clear too many (tsz) bytes resulting in a wrong (-EFAULT) return code by
read_kcore().

Signed-off-by: Adam B. Jerome <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Adam B. Jerome 2006-07-12 09:03:07 -07:00 • committed by Linus Torvalds
commit 0635170b54
1 changed files with 1 additions and 1 deletions
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2
fs/proc/kcore.c
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@ -382,7 +382,7 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
*/
if (n) {
if (clear_user(buffer + tsz - n,
tsz - n))
n))
return -EFAULT;
}
} else {