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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: "Steven Rostedt (VMware)" <rostedt@goodmis.org>,
	Sasha Levin <sashal@kernel.org>,
	mingo@redhat.com
Subject: [PATCH AUTOSEL 4.14 21/39] tracefs: Have tracefs directories not set OTH permission bits by default
Date: Mon,  8 Nov 2021 20:06:31 -0500	[thread overview]
Message-ID: <20211109010649.1191041-21-sashal@kernel.org> (raw)
In-Reply-To: <20211109010649.1191041-1-sashal@kernel.org>

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

[ Upstream commit 49d67e445742bbcb03106b735b2ab39f6e5c56bc ]

The tracefs file system is by default mounted such that only root user can
access it. But there are legitimate reasons to create a group and allow
those added to the group to have access to tracing. By changing the
permissions of the tracefs mount point to allow access, it will allow
group access to the tracefs directory.

There should not be any real reason to allow all access to the tracefs
directory as it contains sensitive information. Have the default
permission of directories being created not have any OTH (other) bits set,
such that an admin that wants to give permission to a group has to first
disable all OTH bits in the file system.

Link: https://lkml.kernel.org/r/20210818153038.664127804@goodmis.org

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/tracefs/inode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c
index bea8ad876bf9a..0c123c5e70e08 100644
--- a/fs/tracefs/inode.c
+++ b/fs/tracefs/inode.c
@@ -427,7 +427,8 @@ static struct dentry *__create_dir(const char *name, struct dentry *parent,
 	if (unlikely(!inode))
 		return failed_creating(dentry);
 
-	inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
+	/* Do not set bits for OTH */
+	inode->i_mode = S_IFDIR | S_IRWXU | S_IRUSR| S_IRGRP | S_IXUSR | S_IXGRP;
 	inode->i_op = ops;
 	inode->i_fop = &simple_dir_operations;
 
-- 
2.33.0


  parent reply	other threads:[~2021-11-09  1:23 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-09  1:06 [PATCH AUTOSEL 4.14 01/39] Bluetooth: sco: Fix lock_sock() blockage by memcpy_from_msg() Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 02/39] Bluetooth: fix use-after-free error in lock_sock_nested() Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 03/39] platform/x86: wmi: do not fail if disabling fails Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 04/39] MIPS: lantiq: dma: add small delay after reset Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 05/39] MIPS: lantiq: dma: reset correct number of channel Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 06/39] locking/lockdep: Avoid RCU-induced noinstr fail Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 07/39] smackfs: Fix use-after-free in netlbl_catmap_walk() Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 08/39] NET: IPV4: fix error "do not initialise globals to 0" Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 09/39] x86: Increase exception stack sizes Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 10/39] mwifiex: Run SET_BSS_MODE when changing from P2P to STATION vif-type Sasha Levin
2021-11-09 18:06   ` Brian Norris
2021-11-14 14:03     ` Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 11/39] mwifiex: Properly initialize private structure on interface type changes Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 12/39] media: mt9p031: Fix corrupted frame after restarting stream Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 13/39] media: netup_unidvb: handle interrupt properly according to the firmware Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 14/39] media: uvcvideo: Set capability in s_param Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 15/39] media: s5p-mfc: fix possible null-pointer dereference in s5p_mfc_probe() Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 16/39] media: s5p-mfc: Add checking to s5p_mfc_probe() Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 17/39] media: mceusb: return without resubmitting URB in case of -EPROTO error Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 18/39] ia64: don't do IA64_CMPXCHG_DEBUG without CONFIG_PRINTK Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 19/39] ACPICA: Avoid evaluating methods too early during system resume Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 20/39] media: usb: dvd-usb: fix uninit-value bug in dibusb_read_eeprom_byte() Sasha Levin
2021-11-09  1:06 ` Sasha Levin [this message]
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 22/39] ath: dfs_pattern_detector: Fix possible null-pointer dereference in channel_detector_create() Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 23/39] ACPI: battery: Accept charges over the design capacity as full Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 24/39] leaking_addresses: Always print a trailing newline Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 25/39] memstick: r592: Fix a UAF bug when removing the driver Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 26/39] lib/xz: Avoid overlapping memcpy() with invalid input with in-place decompression Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 27/39] lib/xz: Validate the value before assigning it to an enum variable Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 28/39] tracing/cfi: Fix cmp_entries_* functions signature mismatch Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 29/39] mwl8k: Fix use-after-free in mwl8k_fw_state_machine() Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 30/39] PM: hibernate: Get block device exclusively in swsusp_check() Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 31/39] iwlwifi: mvm: disable RX-diversity in powersave Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 32/39] smackfs: use __GFP_NOFAIL for smk_cipso_doi() Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 33/39] ARM: clang: Do not rely on lr register for stacktrace Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 34/39] gre/sit: Don't generate link-local addr if addr_gen_mode is IN6_ADDR_GEN_MODE_NONE Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 35/39] ARM: 9136/1: ARMv7-M uses BE-8, not BE-32 Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 36/39] spi: bcm-qspi: Fix missing clk_disable_unprepare() on error in bcm_qspi_probe() Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 37/39] parisc: fix warning in flush_tlb_all Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 38/39] task_stack: Fix end_of_stack() for architectures with upwards-growing stack Sasha Levin
2021-11-09  1:06 ` [PATCH AUTOSEL 4.14 39/39] parisc/kgdb: add kgdb_roundup() to make kgdb work with idle polling Sasha Levin

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