From: Thomas Tuttle Date: Fri, 6 Jun 2008 05:46:58 +0000 (-0700) Subject: pagemap: return EINVAL, not EIO, for unaligned reads of kpagecount or kpageflags X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=4710d1ac4c491dd8a28f57946214c0b5fe73cc87;p=deliverable%2Flinux.git pagemap: return EINVAL, not EIO, for unaligned reads of kpagecount or kpageflags If the user tries to read from a position that is not a multiple of 8, or read a number of bytes that is not a multiple of 8, they have passed an invalid argument to read, for the purpose of reading these files. It's not an IO error because we didn't encounter any trouble finding the data they asked for. Signed-off-by: Thomas Tuttle Cc: Matt Mackall Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c index 5a16090a6d6e..7e277f2ad466 100644 --- a/fs/proc/proc_misc.c +++ b/fs/proc/proc_misc.c @@ -716,7 +716,7 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf, pfn = src / KPMSIZE; count = min_t(size_t, count, (max_pfn * KPMSIZE) - src); if (src & KPMMASK || count & KPMMASK) - return -EIO; + return -EINVAL; while (count > 0) { ppage = NULL; @@ -782,7 +782,7 @@ static ssize_t kpageflags_read(struct file *file, char __user *buf, pfn = src / KPMSIZE; count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src); if (src & KPMMASK || count & KPMMASK) - return -EIO; + return -EINVAL; while (count > 0) { ppage = NULL;