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Message-ID: <18102.33136.963233.867247@gargle.gargle.HOWL> Date: Sun, 5 Aug 2007 21:03:28 -0500 From: boutcher@...umn.edu (Dave Boutcher) To: Matt Mackall <mpm@...enic.com> CC: linux-kernel@...r.kernel.org Subject: [PATCH] Fix /proc/pid/pagemap end address calculation When dumping vma information the pagemap_read routine calculates the minimum of what the user asks for and the end of the vma. Unfortunately the code uses vma->vm_start rather than vma->vm_end which can result in the end address being before the start, and a nasty never-ending loop in the kernel. Diffed against 2.6.23-rc1-mm2 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 b2baeab..b12740c 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -671,7 +671,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf, ret = -EIO; goto out_mm; } - vend = min(vma->vm_start - 1, end - 1) + 1; + vend = min(vma->vm_end - 1, end - 1) + 1; ret = pagemap_fill(&pm, vend); if (ret || !pm.count) break; -- 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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