From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Colin Ian King , Kees Cook , Andrew Morton , Linus Torvalds Subject: [PATCH 4.3 021/200] proc: fix -ESRCH error when writing to /proc/$pid/coredump_filter Date: Sun, 14 Feb 2016 14:20:28 -0800 Message-Id: <20160214222217.897546186@linuxfoundation.org> In-Reply-To: <20160214222217.084543173@linuxfoundation.org> References: <20160214222217.084543173@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Colin Ian King commit 41a0c249cb8706a2efa1ab3d59466b23a27d0c8b upstream. Writing to /proc/$pid/coredump_filter always returns -ESRCH because commit 774636e19ed51 ("proc: convert to kstrto*()/kstrto*_from_user()") removed the setting of ret after the get_proc_task call and incorrectly left it as -ESRCH. Instead, return 0 when successful. Example breakage: echo 0 > /proc/self/coredump_filter bash: echo: write error: No such process Fixes: 774636e19ed51 ("proc: convert to kstrto*()/kstrto*_from_user()") Signed-off-by: Colin Ian King Acked-by: Kees Cook Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- fs/proc/base.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2484,6 +2484,7 @@ static ssize_t proc_coredump_filter_writ mm = get_task_mm(task); if (!mm) goto out_no_mm; + ret = 0; for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { if (val & mask)