From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>, Sasha Levin <sashal@kernel.org>,
linux-fsdevel@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 07/12] proc: don't allow async path resolution of /proc/self components
Date: Wed, 25 Nov 2020 10:37:29 -0500 [thread overview]
Message-ID: <20201125153734.810826-7-sashal@kernel.org> (raw)
In-Reply-To: <20201125153734.810826-1-sashal@kernel.org>
From: Jens Axboe <axboe@kernel.dk>
[ Upstream commit 8d4c3e76e3be11a64df95ddee52e99092d42fc19 ]
If this is attempted by a kthread, then return -EOPNOTSUPP as we don't
currently support that. Once we can get task_pid_ptr() doing the right
thing, then this can go away again.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/proc/self.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/proc/self.c b/fs/proc/self.c
index 398cdf9a9f0c6..eba167e1700ef 100644
--- a/fs/proc/self.c
+++ b/fs/proc/self.c
@@ -15,6 +15,13 @@ static const char *proc_self_get_link(struct dentry *dentry,
pid_t tgid = task_tgid_nr_ns(current, ns);
char *name;
+ /*
+ * Not currently supported. Once we can inherit all of struct pid,
+ * we can allow this.
+ */
+ if (current->flags & PF_KTHREAD)
+ return ERR_PTR(-EOPNOTSUPP);
+
if (!tgid)
return ERR_PTR(-ENOENT);
/* 11 for max length of signed int in decimal + NULL term */
--
2.27.0
next prev parent reply other threads:[~2020-11-25 15:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-25 15:37 [PATCH AUTOSEL 4.14 01/12] HID: cypress: Support Varmilo Keyboards' media hotkeys Sasha Levin
2020-11-25 15:37 ` [PATCH AUTOSEL 4.14 02/12] Input: i8042 - allow insmod to succeed on devices without an i8042 controller Sasha Levin
2020-11-25 15:37 ` [PATCH AUTOSEL 4.14 03/12] HID: hid-sensor-hub: Fix issue with devices with no report ID Sasha Levin
2020-11-25 15:37 ` [PATCH AUTOSEL 4.14 04/12] dmaengine: xilinx_dma: use readl_poll_timeout_atomic variant Sasha Levin
2020-11-25 15:37 ` [PATCH AUTOSEL 4.14 05/12] x86/xen: don't unbind uninitialized lock_kicker_irq Sasha Levin
2020-11-25 15:37 ` [PATCH AUTOSEL 4.14 06/12] HID: Add Logitech Dinovo Edge battery quirk Sasha Levin
2020-11-25 15:37 ` Sasha Levin [this message]
2020-11-25 15:37 ` [PATCH AUTOSEL 4.14 08/12] nvme: free sq/cq dbbuf pointers when dbbuf set fails Sasha Levin
2020-11-25 15:37 ` [PATCH AUTOSEL 4.14 09/12] dmaengine: pl330: _prep_dma_memcpy: Fix wrong burst size Sasha Levin
2020-11-25 15:37 ` [PATCH AUTOSEL 4.14 10/12] scsi: libiscsi: Fix NOP race condition Sasha Levin
2020-11-25 15:37 ` [PATCH AUTOSEL 4.14 11/12] scsi: target: iscsi: Fix cmd abort fabric stop race Sasha Levin
2020-11-25 15:37 ` [PATCH AUTOSEL 4.14 12/12] perf/x86: fix sysfs type mismatches Sasha Levin
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