[PATCH AUTOSEL 5.4 1/9] firmware: arm_scmi: Add SCMI PM driver remove routine

[PATCH AUTOSEL 5.4 1/9] firmware: arm_scmi: Add SCMI PM driver remove routine

[Sasha Levin]

From: Cristian Marussi <cristian.marussi@arm.com>

[ Upstream commit dea796fcab0a219830831c070b8dc367d7e0f708 ]

Currently, when removing the SCMI PM driver not all the resources
registered with genpd subsystem are properly de-registered.

As a side effect of this after a driver unload/load cycle you get a
splat with a few warnings like this:

 | debugfs: Directory 'BIG_CPU0' with parent 'pm_genpd' already present!
 | debugfs: Directory 'BIG_CPU1' with parent 'pm_genpd' already present!
 | debugfs: Directory 'LITTLE_CPU0' with parent 'pm_genpd' already present!
 | debugfs: Directory 'LITTLE_CPU1' with parent 'pm_genpd' already present!
 | debugfs: Directory 'LITTLE_CPU2' with parent 'pm_genpd' already present!
 | debugfs: Directory 'LITTLE_CPU3' with parent 'pm_genpd' already present!
 | debugfs: Directory 'BIG_SSTOP' with parent 'pm_genpd' already present!
 | debugfs: Directory 'LITTLE_SSTOP' with parent 'pm_genpd' already present!
 | debugfs: Directory 'DBGSYS' with parent 'pm_genpd' already present!
 | debugfs: Directory 'GPUTOP' with parent 'pm_genpd' already present!

Add a proper scmi_pm_domain_remove callback to the driver in order to
take care of all the needed cleanups not handled by devres framework.

Link: https://lore.kernel.org/r/20220817172731.1185305-7-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/firmware/arm_scmi/scmi_pm_domain.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/firmware/arm_scmi/scmi_pm_domain.c b/drivers/firmware/arm_scmi/scmi_pm_domain.c
index 177874adccf0..b0c8962b9885 100644
--- a/drivers/firmware/arm_scmi/scmi_pm_domain.c
+++ b/drivers/firmware/arm_scmi/scmi_pm_domain.c
@@ -106,9 +106,28 @@ static int scmi_pm_domain_probe(struct scmi_device *sdev)
 	scmi_pd_data->domains = domains;
 	scmi_pd_data->num_domains = num_domains;
 
+	dev_set_drvdata(dev, scmi_pd_data);
+
 	return of_genpd_add_provider_onecell(np, scmi_pd_data);
 }
 
+static void scmi_pm_domain_remove(struct scmi_device *sdev)
+{
+	int i;
+	struct genpd_onecell_data *scmi_pd_data;
+	struct device *dev = &sdev->dev;
+	struct device_node *np = dev->of_node;
+
+	of_genpd_del_provider(np);
+
+	scmi_pd_data = dev_get_drvdata(dev);
+	for (i = 0; i < scmi_pd_data->num_domains; i++) {
+		if (!scmi_pd_data->domains[i])
+			continue;
+		pm_genpd_remove(scmi_pd_data->domains[i]);
+	}
+}
+
 static const struct scmi_device_id scmi_id_table[] = {
 	{ SCMI_PROTOCOL_POWER },
 	{ },
@@ -118,6 +137,7 @@ MODULE_DEVICE_TABLE(scmi, scmi_id_table);
 static struct scmi_driver scmi_power_domain_driver = {
 	.name = "scmi-power-domain",
 	.probe = scmi_pm_domain_probe,
+	.remove = scmi_pm_domain_remove,
 	.id_table = scmi_id_table,
 };
 module_scmi_driver(scmi_power_domain_driver);
-- 
2.35.1

[PATCH AUTOSEL 5.4 2/9] dmaengine: xilinx_dma: cleanup for fetching xlnx,num-fstores property

[Sasha Levin]

From: Swati Agarwal <swati.agarwal@xilinx.com>

[ Upstream commit 462bce790e6a7e68620a4ce260cc38f7ed0255d5 ]

Free the allocated resources for missing xlnx,num-fstores property.

Signed-off-by: Swati Agarwal <swati.agarwal@xilinx.com>
Link: https://lore.kernel.org/r/20220817061125.4720-3-swati.agarwal@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/dma/xilinx/xilinx_dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 7729b8d22553..792776c86ee8 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -2683,7 +2683,7 @@ static int xilinx_dma_probe(struct platform_device *pdev)
 		if (err < 0) {
 			dev_err(xdev->dev,
 				"missing xlnx,num-fstores property\n");
-			return err;
+			goto disable_clks;
 		}
 
 		err = of_property_read_u32(node, "xlnx,flush-fsync",
-- 
2.35.1

[PATCH AUTOSEL 5.4 3/9] dmaengine: xilinx_dma: Report error in case of dma_set_mask_and_coherent API failure

[Sasha Levin]

From: Swati Agarwal <swati.agarwal@xilinx.com>

[ Upstream commit 8f2b6bc79c32f0fa60df000ae387a790ec80eae9 ]

The driver does not handle the failure case while calling
dma_set_mask_and_coherent API.

In case of failure, capture the return value of API and then report an
error.

Addresses-coverity: Unchecked return value (CHECKED_RETURN)

Signed-off-by: Swati Agarwal <swati.agarwal@xilinx.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/20220817061125.4720-4-swati.agarwal@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/dma/xilinx/xilinx_dma.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 792776c86ee8..3bb711e735ab 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -2703,7 +2703,11 @@ static int xilinx_dma_probe(struct platform_device *pdev)
 		xdev->ext_addr = false;
 
 	/* Set the dma mask bits */
-	dma_set_mask_and_coherent(xdev->dev, DMA_BIT_MASK(addr_width));
+	err = dma_set_mask_and_coherent(xdev->dev, DMA_BIT_MASK(addr_width));
+	if (err < 0) {
+		dev_err(xdev->dev, "DMA mask error %d\n", err);
+		goto disable_clks;
+	}
 
 	/* Initialize the DMA engine */
 	xdev->common.dev = &pdev->dev;
-- 
2.35.1

[PATCH AUTOSEL 5.4 4/9] ARM: dts: fix Moxa SDIO 'compatible', remove 'sdhci' misnomer

[Sasha Levin]

From: Sergei Antonov <saproj@gmail.com>

[ Upstream commit 02181e68275d28cab3c3f755852770367f1bc229 ]

Driver moxart-mmc.c has .compatible = "moxa,moxart-mmc".

But moxart .dts/.dtsi and the documentation file moxa,moxart-dma.txt
contain compatible = "moxa,moxart-sdhci".

Change moxart .dts/.dtsi files and moxa,moxart-dma.txt to match the driver.

Replace 'sdhci' with 'mmc' in names too, since SDHCI is a different
controller from FTSDC010.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sergei Antonov <saproj@gmail.com>
Cc: Jonas Jensen <jonas.jensen@gmail.com>
Link: https://lore.kernel.org/r/20220907175341.1477383-1-saproj@gmail.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 Documentation/devicetree/bindings/dma/moxa,moxart-dma.txt | 4 ++--
 arch/arm/boot/dts/moxart-uc7112lx.dts                     | 2 +-
 arch/arm/boot/dts/moxart.dtsi                             | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/moxa,moxart-dma.txt b/Documentation/devicetree/bindings/dma/moxa,moxart-dma.txt
index 8a9f3559335b..7e14e26676ec 100644
--- a/Documentation/devicetree/bindings/dma/moxa,moxart-dma.txt
+++ b/Documentation/devicetree/bindings/dma/moxa,moxart-dma.txt
@@ -34,8 +34,8 @@ Example:
 Use specific request line passing from dma
 For example, MMC request line is 5
 
-	sdhci: sdhci@98e00000 {
-		compatible = "moxa,moxart-sdhci";
+	mmc: mmc@98e00000 {
+		compatible = "moxa,moxart-mmc";
 		reg = <0x98e00000 0x5C>;
 		interrupts = <5 0>;
 		clocks = <&clk_apb>;
diff --git a/arch/arm/boot/dts/moxart-uc7112lx.dts b/arch/arm/boot/dts/moxart-uc7112lx.dts
index eb5291b0ee3a..e07b807b4cec 100644
--- a/arch/arm/boot/dts/moxart-uc7112lx.dts
+++ b/arch/arm/boot/dts/moxart-uc7112lx.dts
@@ -79,7 +79,7 @@ &clk_pll {
 	clocks = <&ref12>;
 };
 
-&sdhci {
+&mmc {
 	status = "okay";
 };
 
diff --git a/arch/arm/boot/dts/moxart.dtsi b/arch/arm/boot/dts/moxart.dtsi
index f5f070a87482..764832ddfa78 100644
--- a/arch/arm/boot/dts/moxart.dtsi
+++ b/arch/arm/boot/dts/moxart.dtsi
@@ -93,8 +93,8 @@ watchdog: watchdog@98500000 {
 			clock-names = "PCLK";
 		};
 
-		sdhci: sdhci@98e00000 {
-			compatible = "moxa,moxart-sdhci";
+		mmc: mmc@98e00000 {
+			compatible = "moxa,moxart-mmc";
 			reg = <0x98e00000 0x5C>;
 			interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&clk_apb>;
-- 
2.35.1

[PATCH AUTOSEL 5.4 5/9] scsi: qedf: Fix a UAF bug in __qedf_probe()

[Sasha Levin]

From: Letu Ren <fantasquex@gmail.com>

[ Upstream commit fbfe96869b782364caebae0445763969ddb6ea67 ]

In __qedf_probe(), if qedf->cdev is NULL which means
qed_ops->common->probe() failed, then the program will goto label err1, and
scsi_host_put() will free lport->host pointer. Because the memory qedf
points to is allocated by libfc_host_alloc(), it will be freed by
scsi_host_put(). However, the if statement below label err0 only checks
whether qedf is NULL but doesn't check whether the memory has been freed.
So a UAF bug can occur.

There are two ways to reach the statements below err0. The first one is
described as before, "qedf" should be set to NULL. The second one is goto
"err0" directly. In the latter scenario qedf hasn't been changed and it has
the initial value NULL. As a result the if statement is not reachable in
any situation.

The KASAN logs are as follows:

[    2.312969] BUG: KASAN: use-after-free in __qedf_probe+0x5dcf/0x6bc0
[    2.312969]
[    2.312969] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
[    2.312969] Call Trace:
[    2.312969]  dump_stack_lvl+0x59/0x7b
[    2.312969]  print_address_description+0x7c/0x3b0
[    2.312969]  ? __qedf_probe+0x5dcf/0x6bc0
[    2.312969]  __kasan_report+0x160/0x1c0
[    2.312969]  ? __qedf_probe+0x5dcf/0x6bc0
[    2.312969]  kasan_report+0x4b/0x70
[    2.312969]  ? kobject_put+0x25d/0x290
[    2.312969]  kasan_check_range+0x2ca/0x310
[    2.312969]  __qedf_probe+0x5dcf/0x6bc0
[    2.312969]  ? selinux_kernfs_init_security+0xdc/0x5f0
[    2.312969]  ? trace_rpm_return_int_rcuidle+0x18/0x120
[    2.312969]  ? rpm_resume+0xa5c/0x16e0
[    2.312969]  ? qedf_get_generic_tlv_data+0x160/0x160
[    2.312969]  local_pci_probe+0x13c/0x1f0
[    2.312969]  pci_device_probe+0x37e/0x6c0

Link: https://lore.kernel.org/r/20211112120641.16073-1-fantasquex@gmail.com
Reported-by: Zheyu Ma <zheyuma97@gmail.com>
Acked-by: Saurav Kashyap <skashyap@marvell.com>
Co-developed-by: Wende Tan <twd2.me@gmail.com>
Signed-off-by: Wende Tan <twd2.me@gmail.com>
Signed-off-by: Letu Ren <fantasquex@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/qedf/qedf_main.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
index c95e04cc6424..f864ef059d29 100644
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -3544,11 +3544,6 @@ static int __qedf_probe(struct pci_dev *pdev, int mode)
 err1:
 	scsi_host_put(lport->host);
 err0:
-	if (qedf) {
-		QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC, "Probe done.\n");
-
-		clear_bit(QEDF_PROBING, &qedf->flags);
-	}
 	return rc;
 }
 
-- 
2.35.1

[PATCH AUTOSEL 5.4 6/9] net/ieee802154: fix uninit value bug in dgram_sendmsg

[Sasha Levin]

From: Haimin Zhang <tcs.kernel@gmail.com>

[ Upstream commit 94160108a70c8af17fa1484a37e05181c0e094af ]

There is uninit value bug in dgram_sendmsg function in
net/ieee802154/socket.c when the length of valid data pointed by the
msg->msg_name isn't verified.

We introducing a helper function ieee802154_sockaddr_check_size to
check namelen. First we check there is addr_type in ieee802154_addr_sa.
Then, we check namelen according to addr_type.

Also fixed in raw_bind, dgram_bind, dgram_connect.

Signed-off-by: Haimin Zhang <tcs_kernel@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 include/net/ieee802154_netdev.h | 37 +++++++++++++++++++++++++++++
 net/ieee802154/socket.c         | 42 ++++++++++++++++++---------------
 2 files changed, 60 insertions(+), 19 deletions(-)

diff --git a/include/net/ieee802154_netdev.h b/include/net/ieee802154_netdev.h
index d0d188c3294b..a8994f307fc3 100644
--- a/include/net/ieee802154_netdev.h
+++ b/include/net/ieee802154_netdev.h
@@ -15,6 +15,22 @@
 #ifndef IEEE802154_NETDEVICE_H
 #define IEEE802154_NETDEVICE_H
 
+#define IEEE802154_REQUIRED_SIZE(struct_type, member) \
+	(offsetof(typeof(struct_type), member) + \
+	sizeof(((typeof(struct_type) *)(NULL))->member))
+
+#define IEEE802154_ADDR_OFFSET \
+	offsetof(typeof(struct sockaddr_ieee802154), addr)
+
+#define IEEE802154_MIN_NAMELEN (IEEE802154_ADDR_OFFSET + \
+	IEEE802154_REQUIRED_SIZE(struct ieee802154_addr_sa, addr_type))
+
+#define IEEE802154_NAMELEN_SHORT (IEEE802154_ADDR_OFFSET + \
+	IEEE802154_REQUIRED_SIZE(struct ieee802154_addr_sa, short_addr))
+
+#define IEEE802154_NAMELEN_LONG (IEEE802154_ADDR_OFFSET + \
+	IEEE802154_REQUIRED_SIZE(struct ieee802154_addr_sa, hwaddr))
+
 #include <net/af_ieee802154.h>
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
@@ -165,6 +181,27 @@ static inline void ieee802154_devaddr_to_raw(void *raw, __le64 addr)
 	memcpy(raw, &temp, IEEE802154_ADDR_LEN);
 }
 
+static inline int
+ieee802154_sockaddr_check_size(struct sockaddr_ieee802154 *daddr, int len)
+{
+	struct ieee802154_addr_sa *sa;
+
+	sa = &daddr->addr;
+	if (len < IEEE802154_MIN_NAMELEN)
+		return -EINVAL;
+	switch (sa->addr_type) {
+	case IEEE802154_ADDR_SHORT:
+		if (len < IEEE802154_NAMELEN_SHORT)
+			return -EINVAL;
+		break;
+	case IEEE802154_ADDR_LONG:
+		if (len < IEEE802154_NAMELEN_LONG)
+			return -EINVAL;
+		break;
+	}
+	return 0;
+}
+
 static inline void ieee802154_addr_from_sa(struct ieee802154_addr *a,
 					   const struct ieee802154_addr_sa *sa)
 {
diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
index 9a675ba0bf0a..a92b11999e5f 100644
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -201,8 +201,9 @@ static int raw_bind(struct sock *sk, struct sockaddr *_uaddr, int len)
 	int err = 0;
 	struct net_device *dev = NULL;
 
-	if (len < sizeof(*uaddr))
-		return -EINVAL;
+	err = ieee802154_sockaddr_check_size(uaddr, len);
+	if (err < 0)
+		return err;
 
 	uaddr = (struct sockaddr_ieee802154 *)_uaddr;
 	if (uaddr->family != AF_IEEE802154)
@@ -498,7 +499,8 @@ static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
 
 	ro->bound = 0;
 
-	if (len < sizeof(*addr))
+	err = ieee802154_sockaddr_check_size(addr, len);
+	if (err < 0)
 		goto out;
 
 	if (addr->family != AF_IEEE802154)
@@ -569,8 +571,9 @@ static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
 	struct dgram_sock *ro = dgram_sk(sk);
 	int err = 0;
 
-	if (len < sizeof(*addr))
-		return -EINVAL;
+	err = ieee802154_sockaddr_check_size(addr, len);
+	if (err < 0)
+		return err;
 
 	if (addr->family != AF_IEEE802154)
 		return -EINVAL;
@@ -609,6 +612,7 @@ static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 	struct ieee802154_mac_cb *cb;
 	struct dgram_sock *ro = dgram_sk(sk);
 	struct ieee802154_addr dst_addr;
+	DECLARE_SOCKADDR(struct sockaddr_ieee802154*, daddr, msg->msg_name);
 	int hlen, tlen;
 	int err;
 
@@ -617,10 +621,20 @@ static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 		return -EOPNOTSUPP;
 	}
 
-	if (!ro->connected && !msg->msg_name)
-		return -EDESTADDRREQ;
-	else if (ro->connected && msg->msg_name)
-		return -EISCONN;
+	if (msg->msg_name) {
+		if (ro->connected)
+			return -EISCONN;
+		if (msg->msg_namelen < IEEE802154_MIN_NAMELEN)
+			return -EINVAL;
+		err = ieee802154_sockaddr_check_size(daddr, msg->msg_namelen);
+		if (err < 0)
+			return err;
+		ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
+	} else {
+		if (!ro->connected)
+			return -EDESTADDRREQ;
+		dst_addr = ro->dst_addr;
+	}
 
 	if (!ro->bound)
 		dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
@@ -656,16 +670,6 @@ static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 	cb = mac_cb_init(skb);
 	cb->type = IEEE802154_FC_TYPE_DATA;
 	cb->ackreq = ro->want_ack;
-
-	if (msg->msg_name) {
-		DECLARE_SOCKADDR(struct sockaddr_ieee802154*,
-				 daddr, msg->msg_name);
-
-		ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
-	} else {
-		dst_addr = ro->dst_addr;
-	}
-
 	cb->secen = ro->secen;
 	cb->secen_override = ro->secen_override;
 	cb->seclevel = ro->seclevel;
-- 
2.35.1

[PATCH AUTOSEL 5.4 7/9] um: Cleanup syscall_handler_t cast in syscalls_32.h

[Sasha Levin]

From: Lukas Straub <lukasstraub2@web.de>

[ Upstream commit 61670b4d270c71219def1fbc9441debc2ac2e6e9 ]

Like in f4f03f299a56ce4d73c5431e0327b3b6cb55ebb9
"um: Cleanup syscall_handler_t definition/cast, fix warning",
remove the cast to to fix the compiler warning.

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/x86/um/shared/sysdep/syscalls_32.h | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/um/shared/sysdep/syscalls_32.h b/arch/x86/um/shared/sysdep/syscalls_32.h
index 68fd2cf526fd..f6e9f84397e7 100644
--- a/arch/x86/um/shared/sysdep/syscalls_32.h
+++ b/arch/x86/um/shared/sysdep/syscalls_32.h
@@ -6,10 +6,9 @@
 #include <asm/unistd.h>
 #include <sysdep/ptrace.h>
 
-typedef long syscall_handler_t(struct pt_regs);
+typedef long syscall_handler_t(struct syscall_args);
 
 extern syscall_handler_t *sys_call_table[];
 
 #define EXECUTE_SYSCALL(syscall, regs) \
-	((long (*)(struct syscall_args)) \
-	 (*sys_call_table[syscall]))(SYSCALL_ARGS(&regs->regs))
+	((*sys_call_table[syscall]))(SYSCALL_ARGS(&regs->regs))
-- 
2.35.1

[PATCH AUTOSEL 5.4 8/9] um: Cleanup compiler warning in arch/x86/um/tls_32.c

[Sasha Levin]

From: Lukas Straub <lukasstraub2@web.de>

[ Upstream commit d27fff3499671dc23a08efd01cdb8b3764a391c4 ]

arch.tls_array is statically allocated so checking for NULL doesn't
make sense. This causes the compiler warning below.

Remove the checks to silence these warnings.

../arch/x86/um/tls_32.c: In function 'get_free_idx':
../arch/x86/um/tls_32.c:68:13: warning: the comparison will always evaluate as 'true' for the address of 'tls_array' will never be NULL [-Waddress]
   68 |         if (!t->arch.tls_array)
      |             ^
In file included from ../arch/x86/um/asm/processor.h:10,
                 from ../include/linux/rcupdate.h:30,
                 from ../include/linux/rculist.h:11,
                 from ../include/linux/pid.h:5,
                 from ../include/linux/sched.h:14,
                 from ../arch/x86/um/tls_32.c:7:
../arch/x86/um/asm/processor_32.h:22:31: note: 'tls_array' declared here
   22 |         struct uml_tls_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
      |                               ^~~~~~~~~
../arch/x86/um/tls_32.c: In function 'get_tls_entry':
../arch/x86/um/tls_32.c:243:13: warning: the comparison will always evaluate as 'true' for the address of 'tls_array' will never be NULL [-Waddress]
  243 |         if (!t->arch.tls_array)
      |             ^
../arch/x86/um/asm/processor_32.h:22:31: note: 'tls_array' declared here
   22 |         struct uml_tls_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
      |                               ^~~~~~~~~

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/x86/um/tls_32.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/x86/um/tls_32.c b/arch/x86/um/tls_32.c
index ac8eee093f9c..66162eafd8e8 100644
--- a/arch/x86/um/tls_32.c
+++ b/arch/x86/um/tls_32.c
@@ -65,9 +65,6 @@ static int get_free_idx(struct task_struct* task)
 	struct thread_struct *t = &task->thread;
 	int idx;
 
-	if (!t->arch.tls_array)
-		return GDT_ENTRY_TLS_MIN;
-
 	for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++)
 		if (!t->arch.tls_array[idx].present)
 			return idx + GDT_ENTRY_TLS_MIN;
@@ -240,9 +237,6 @@ static int get_tls_entry(struct task_struct *task, struct user_desc *info,
 {
 	struct thread_struct *t = &task->thread;
 
-	if (!t->arch.tls_array)
-		goto clear;
-
 	if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
 		return -EINVAL;
 
-- 
2.35.1

[PATCH AUTOSEL 5.4 9/9] arch: um: Mark the stack non-executable to fix a binutils warning

[Sasha Levin]

From: David Gow <davidgow@google.com>

[ Upstream commit bd71558d585ac61cfd799db7f25e78dca404dd7a ]

Since binutils 2.39, ld will print a warning if any stack section is
executable, which is the default for stack sections on files without a
.note.GNU-stack section.

This was fixed for x86 in commit ffcf9c5700e4 ("x86: link vdso and boot with -z noexecstack --no-warn-rwx-segments"),
but remained broken for UML, resulting in several warnings:

/usr/bin/ld: warning: arch/x86/um/vdso/vdso.o: missing .note.GNU-stack section implies executable stack
/usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
/usr/bin/ld: warning: .tmp_vmlinux.kallsyms1 has a LOAD segment with RWX permissions
/usr/bin/ld: warning: .tmp_vmlinux.kallsyms1.o: missing .note.GNU-stack section implies executable stack
/usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
/usr/bin/ld: warning: .tmp_vmlinux.kallsyms2 has a LOAD segment with RWX permissions
/usr/bin/ld: warning: .tmp_vmlinux.kallsyms2.o: missing .note.GNU-stack section implies executable stack
/usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
/usr/bin/ld: warning: vmlinux has a LOAD segment with RWX permissions

Link both the VDSO and vmlinux with -z noexecstack, fixing the warnings
about .note.GNU-stack sections. In addition, pass --no-warn-rwx-segments
to dodge the remaining warnings about LOAD segments with RWX permissions
in the kallsyms objects. (Note that this flag is apparently not
available on lld, so hide it behind a test for BFD, which is what the
x86 patch does.)

Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ffcf9c5700e49c0aee42dcba9a12ba21338e8136
Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=ba951afb99912da01a6e8434126b8fac7aa75107
Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Lukas Straub <lukasstraub2@web.de>
Tested-by: Lukas Straub <lukasstraub2@web.de>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/um/Makefile          | 8 ++++++++
 arch/x86/um/vdso/Makefile | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/um/Makefile b/arch/um/Makefile
index 275f5ffdf6f0..773120be0f56 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -132,10 +132,18 @@ export LDS_ELF_FORMAT := $(ELF_FORMAT)
 # The wrappers will select whether using "malloc" or the kernel allocator.
 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 
+# Avoid binutils 2.39+ warnings by marking the stack non-executable and
+# ignorning warnings for the kallsyms sections.
+LDFLAGS_EXECSTACK = -z noexecstack
+ifeq ($(CONFIG_LD_IS_BFD),y)
+LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments)
+endif
+
 LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt))
 
 # Used by link-vmlinux.sh which has special support for um link
 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
+export LDFLAGS_vmlinux := $(LDFLAGS_EXECSTACK)
 
 # When cleaning we don't include .config, so we don't include
 # TT or skas makefiles and don't clean skas_ptregs.h.
diff --git a/arch/x86/um/vdso/Makefile b/arch/x86/um/vdso/Makefile
index 0caddd6acb22..bec115036f87 100644
--- a/arch/x86/um/vdso/Makefile
+++ b/arch/x86/um/vdso/Makefile
@@ -62,7 +62,7 @@ quiet_cmd_vdso = VDSO    $@
 		       -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
 		 sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
 
-VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv
+VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack
 GCOV_PROFILE := n
 
 #
-- 
2.35.1