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Message-ID: <18102.49994.250514.93818@gargle.gargle.HOWL> Date: Mon, 6 Aug 2007 01:44:26 -0500 From: boutcher@...umn.edu (Dave Boutcher) To: Matt Mackall <mpm@...enic.com> CC: linux-kernel@...r.kernel.org, Dave Hansen <haveblue@...ibm.com>, Andrew Morton <akpm@...ux-foundation.org> Subject: [PATCH 1/3] Fix /proc/pid/pagemap return length calculation /proc/pid/pagemap has a header (usually 8 bytes) the length of which needs to be compensated for when converting from proc file offset to page number. The calculation of the starting page number (svpfn) compensates for this, but the calculation of the ending page number (evpfn) does not, resulting in reads returning 8 bytes more than were asked for. Signed-off-by: Dave Boutcher <boutcher@...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 4594f15..b2baeab 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -627,7 +627,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf, addr = PAGE_SIZE * svpfn; if ((svpfn + 1) * sizeof(unsigned long) != src) goto out; - evpfn = min((src + count) / sizeof(unsigned long), + evpfn = min((src + count) / sizeof(unsigned long) - 1, ((~0UL) >> PAGE_SHIFT) + 1); count = (evpfn - svpfn) * sizeof(unsigned long); end = PAGE_SIZE * evpfn; -- 1.4.4.2 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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