* [PATCH] PCI: dwc: fix find_next_bit() usage
@ 2019-09-04 16:03 Niklas Cassel
2019-09-12 11:31 ` Gustavo Pimentel
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: Niklas Cassel @ 2019-09-04 16:03 UTC (permalink / raw)
To: Jingoo Han, Gustavo Pimentel
Cc: Niklas Cassel, Lorenzo Pieralisi, Bjorn Helgaas, linux-pci, linux-kernel
find_next_bit() takes a parameter of size long, and performs arithmetic
that assumes that the argument is of size long.
Therefore we cannot pass a u32, since this will cause find_next_bit()
to read outside the stack buffer and will produce the following print:
BUG: KASAN: stack-out-of-bounds in find_next_bit+0x38/0xb0
Fixes: 1b497e6493c4 ("PCI: dwc: Fix uninitialized variable in dw_handle_msi_irq()")
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
---
drivers/pci/controller/dwc/pcie-designware-host.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index d3156446ff27..45f21640c977 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -78,7 +78,8 @@ static struct msi_domain_info dw_pcie_msi_domain_info = {
irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
{
int i, pos, irq;
- u32 val, num_ctrls;
+ unsigned long val;
+ u32 status, num_ctrls;
irqreturn_t ret = IRQ_NONE;
num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
@@ -86,14 +87,14 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
for (i = 0; i < num_ctrls; i++) {
dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS +
(i * MSI_REG_CTRL_BLOCK_SIZE),
- 4, &val);
- if (!val)
+ 4, &status);
+ if (!status)
continue;
ret = IRQ_HANDLED;
+ val = status;
pos = 0;
- while ((pos = find_next_bit((unsigned long *) &val,
- MAX_MSI_IRQS_PER_CTRL,
+ while ((pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL,
pos)) != MAX_MSI_IRQS_PER_CTRL) {
irq = irq_find_mapping(pp->irq_domain,
(i * MAX_MSI_IRQS_PER_CTRL) +
--
2.21.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* RE: [PATCH] PCI: dwc: fix find_next_bit() usage
2019-09-04 16:03 [PATCH] PCI: dwc: fix find_next_bit() usage Niklas Cassel
@ 2019-09-12 11:31 ` Gustavo Pimentel
2019-09-12 13:04 ` Andrew Murray
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Gustavo Pimentel @ 2019-09-12 11:31 UTC (permalink / raw)
To: Niklas Cassel, Jingoo Han, Gustavo Pimentel
Cc: Lorenzo Pieralisi, Bjorn Helgaas, linux-pci, linux-kernel
On Wed, Sep 4, 2019 at 17:3:38, Niklas Cassel <niklas.cassel@linaro.org>
wrote:
> find_next_bit() takes a parameter of size long, and performs arithmetic
> that assumes that the argument is of size long.
>
> Therefore we cannot pass a u32, since this will cause find_next_bit()
> to read outside the stack buffer and will produce the following print:
> BUG: KASAN: stack-out-of-bounds in find_next_bit+0x38/0xb0
>
> Fixes: 1b497e6493c4 ("PCI: dwc: Fix uninitialized variable in dw_handle_msi_irq()")
> Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index d3156446ff27..45f21640c977 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -78,7 +78,8 @@ static struct msi_domain_info dw_pcie_msi_domain_info = {
> irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
> {
> int i, pos, irq;
> - u32 val, num_ctrls;
> + unsigned long val;
> + u32 status, num_ctrls;
> irqreturn_t ret = IRQ_NONE;
>
> num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
> @@ -86,14 +87,14 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
> for (i = 0; i < num_ctrls; i++) {
> dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS +
> (i * MSI_REG_CTRL_BLOCK_SIZE),
> - 4, &val);
> - if (!val)
> + 4, &status);
> + if (!status)
> continue;
>
> ret = IRQ_HANDLED;
> + val = status;
> pos = 0;
> - while ((pos = find_next_bit((unsigned long *) &val,
> - MAX_MSI_IRQS_PER_CTRL,
> + while ((pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL,
> pos)) != MAX_MSI_IRQS_PER_CTRL) {
> irq = irq_find_mapping(pp->irq_domain,
> (i * MAX_MSI_IRQS_PER_CTRL) +
> --
> 2.21.0
Hi Niklas!
The patch looks nice! Thanks!
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] PCI: dwc: fix find_next_bit() usage
2019-09-04 16:03 [PATCH] PCI: dwc: fix find_next_bit() usage Niklas Cassel
2019-09-12 11:31 ` Gustavo Pimentel
@ 2019-09-12 13:04 ` Andrew Murray
2019-09-13 21:57 ` Bjorn Andersson
2019-10-15 15:34 ` Lorenzo Pieralisi
3 siblings, 0 replies; 5+ messages in thread
From: Andrew Murray @ 2019-09-12 13:04 UTC (permalink / raw)
To: Niklas Cassel
Cc: Jingoo Han, Gustavo Pimentel, Lorenzo Pieralisi, Bjorn Helgaas,
linux-pci, linux-kernel
On Wed, Sep 04, 2019 at 06:03:38PM +0200, Niklas Cassel wrote:
> find_next_bit() takes a parameter of size long, and performs arithmetic
> that assumes that the argument is of size long.
>
> Therefore we cannot pass a u32, since this will cause find_next_bit()
> to read outside the stack buffer and will produce the following print:
> BUG: KASAN: stack-out-of-bounds in find_next_bit+0x38/0xb0
>
> Fixes: 1b497e6493c4 ("PCI: dwc: Fix uninitialized variable in dw_handle_msi_irq()")
> Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
> ---
Reviewed-by: Andrew Murray <andrew.murray@arm.com>
> drivers/pci/controller/dwc/pcie-designware-host.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index d3156446ff27..45f21640c977 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -78,7 +78,8 @@ static struct msi_domain_info dw_pcie_msi_domain_info = {
> irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
> {
> int i, pos, irq;
> - u32 val, num_ctrls;
> + unsigned long val;
> + u32 status, num_ctrls;
> irqreturn_t ret = IRQ_NONE;
>
> num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
> @@ -86,14 +87,14 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
> for (i = 0; i < num_ctrls; i++) {
> dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS +
> (i * MSI_REG_CTRL_BLOCK_SIZE),
> - 4, &val);
> - if (!val)
> + 4, &status);
> + if (!status)
> continue;
>
> ret = IRQ_HANDLED;
> + val = status;
> pos = 0;
> - while ((pos = find_next_bit((unsigned long *) &val,
> - MAX_MSI_IRQS_PER_CTRL,
> + while ((pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL,
> pos)) != MAX_MSI_IRQS_PER_CTRL) {
> irq = irq_find_mapping(pp->irq_domain,
> (i * MAX_MSI_IRQS_PER_CTRL) +
> --
> 2.21.0
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] PCI: dwc: fix find_next_bit() usage
2019-09-04 16:03 [PATCH] PCI: dwc: fix find_next_bit() usage Niklas Cassel
2019-09-12 11:31 ` Gustavo Pimentel
2019-09-12 13:04 ` Andrew Murray
@ 2019-09-13 21:57 ` Bjorn Andersson
2019-10-15 15:34 ` Lorenzo Pieralisi
3 siblings, 0 replies; 5+ messages in thread
From: Bjorn Andersson @ 2019-09-13 21:57 UTC (permalink / raw)
To: Niklas Cassel
Cc: Jingoo Han, Gustavo Pimentel, Lorenzo Pieralisi, Bjorn Helgaas,
linux-pci, lkml
On Wed, Sep 4, 2019 at 9:03 AM Niklas Cassel <niklas.cassel@linaro.org> wrote:
>
> find_next_bit() takes a parameter of size long, and performs arithmetic
> that assumes that the argument is of size long.
>
> Therefore we cannot pass a u32, since this will cause find_next_bit()
> to read outside the stack buffer and will produce the following print:
> BUG: KASAN: stack-out-of-bounds in find_next_bit+0x38/0xb0
>
> Fixes: 1b497e6493c4 ("PCI: dwc: Fix uninitialized variable in dw_handle_msi_irq()")
> Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Tested-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index d3156446ff27..45f21640c977 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -78,7 +78,8 @@ static struct msi_domain_info dw_pcie_msi_domain_info = {
> irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
> {
> int i, pos, irq;
> - u32 val, num_ctrls;
> + unsigned long val;
> + u32 status, num_ctrls;
> irqreturn_t ret = IRQ_NONE;
>
> num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
> @@ -86,14 +87,14 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
> for (i = 0; i < num_ctrls; i++) {
> dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS +
> (i * MSI_REG_CTRL_BLOCK_SIZE),
> - 4, &val);
> - if (!val)
> + 4, &status);
> + if (!status)
> continue;
>
> ret = IRQ_HANDLED;
> + val = status;
> pos = 0;
> - while ((pos = find_next_bit((unsigned long *) &val,
> - MAX_MSI_IRQS_PER_CTRL,
> + while ((pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL,
> pos)) != MAX_MSI_IRQS_PER_CTRL) {
> irq = irq_find_mapping(pp->irq_domain,
> (i * MAX_MSI_IRQS_PER_CTRL) +
> --
> 2.21.0
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] PCI: dwc: fix find_next_bit() usage
2019-09-04 16:03 [PATCH] PCI: dwc: fix find_next_bit() usage Niklas Cassel
` (2 preceding siblings ...)
2019-09-13 21:57 ` Bjorn Andersson
@ 2019-10-15 15:34 ` Lorenzo Pieralisi
3 siblings, 0 replies; 5+ messages in thread
From: Lorenzo Pieralisi @ 2019-10-15 15:34 UTC (permalink / raw)
To: Niklas Cassel
Cc: Jingoo Han, Gustavo Pimentel, Bjorn Helgaas, linux-pci, linux-kernel
On Wed, Sep 04, 2019 at 06:03:38PM +0200, Niklas Cassel wrote:
> find_next_bit() takes a parameter of size long, and performs arithmetic
> that assumes that the argument is of size long.
>
> Therefore we cannot pass a u32, since this will cause find_next_bit()
> to read outside the stack buffer and will produce the following print:
> BUG: KASAN: stack-out-of-bounds in find_next_bit+0x38/0xb0
>
> Fixes: 1b497e6493c4 ("PCI: dwc: Fix uninitialized variable in dw_handle_msi_irq()")
> Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
Applied to pci/dwc, thanks.
Lorenzo
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index d3156446ff27..45f21640c977 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -78,7 +78,8 @@ static struct msi_domain_info dw_pcie_msi_domain_info = {
> irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
> {
> int i, pos, irq;
> - u32 val, num_ctrls;
> + unsigned long val;
> + u32 status, num_ctrls;
> irqreturn_t ret = IRQ_NONE;
>
> num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
> @@ -86,14 +87,14 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
> for (i = 0; i < num_ctrls; i++) {
> dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS +
> (i * MSI_REG_CTRL_BLOCK_SIZE),
> - 4, &val);
> - if (!val)
> + 4, &status);
> + if (!status)
> continue;
>
> ret = IRQ_HANDLED;
> + val = status;
> pos = 0;
> - while ((pos = find_next_bit((unsigned long *) &val,
> - MAX_MSI_IRQS_PER_CTRL,
> + while ((pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL,
> pos)) != MAX_MSI_IRQS_PER_CTRL) {
> irq = irq_find_mapping(pp->irq_domain,
> (i * MAX_MSI_IRQS_PER_CTRL) +
> --
> 2.21.0
>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2019-10-15 15:34 UTC | newest]
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2019-09-04 16:03 [PATCH] PCI: dwc: fix find_next_bit() usage Niklas Cassel
2019-09-12 11:31 ` Gustavo Pimentel
2019-09-12 13:04 ` Andrew Murray
2019-09-13 21:57 ` Bjorn Andersson
2019-10-15 15:34 ` Lorenzo Pieralisi
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