[PATCH openEuler-1.0-LTS 1/2] usb: dwc3: core: Skip setting event buffers for host only controllers
From: Krishna Kurapati quic_kriskura@quicinc.com
stable inclusion from stable-v4.19.321 commit 320bb9a5a6b79ba123d1e1f746edb52b41c7c1fb bugzilla: https://gitee.com/src-openeuler/kernel/issues/ CVE: CVE-2024-46675
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 89d7f962994604a3e3d480832788d06179abefc5 ]
On some SoC's like SA8295P where the tertiary controller is host-only capable, GEVTADDRHI/LO, GEVTSIZ, GEVTCOUNT registers are not accessible. Trying to access them leads to a crash.
For DRD/Peripheral supported controllers, event buffer setup is done again in gadget_pullup. Skip setup or cleanup of event buffers if controller is host-only capable.
Suggested-by: Johan Hovold johan@kernel.org Signed-off-by: Krishna Kurapati quic_kriskura@quicinc.com Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Reviewed-by: Johan Hovold johan+linaro@kernel.org Reviewed-by: Bjorn Andersson andersson@kernel.org Tested-by: Johan Hovold johan+linaro@kernel.org Link: https://lore.kernel.org/r/20240420044901.884098-4-quic_kriskura@quicinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Lin Ruifeng linruifeng4@huawei.com --- drivers/usb/dwc3/core.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 8e3c23568faf..aa1f69464126 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -388,6 +388,13 @@ static void dwc3_free_event_buffers(struct dwc3 *dwc) static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length) { struct dwc3_event_buffer *evt; + unsigned int hw_mode; + + hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); + if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) { + dwc->ev_buf = NULL; + return 0; + }
evt = dwc3_alloc_one_event_buffer(dwc, length); if (IS_ERR(evt)) { @@ -409,6 +416,9 @@ int dwc3_event_buffers_setup(struct dwc3 *dwc) { struct dwc3_event_buffer *evt;
+ if (!dwc->ev_buf) + return 0; + evt = dwc->ev_buf; evt->lpos = 0; dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0), @@ -426,6 +436,9 @@ void dwc3_event_buffers_cleanup(struct dwc3 *dwc) { struct dwc3_event_buffer *evt;
+ if (!dwc->ev_buf) + return; + evt = dwc->ev_buf;
evt->lpos = 0;
From: Selvarasu Ganesan selvarasu.g@samsung.com
stable inclusion from stable-4.19.321 commit eca3f543f817da87c00d1a5697b473efb548204f bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAR5YA CVE: CVE-2024-46675
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 14e497183df28c006603cc67fd3797a537eef7b9 upstream.
This commit addresses an issue where the USB core could access an invalid event buffer address during runtime suspend, potentially causing SMMU faults and other memory issues in Exynos platforms. The problem arises from the following sequence. 1. In dwc3_gadget_suspend, there is a chance of a timeout when moving the USB core to the halt state after clearing the run/stop bit by software. 2. In dwc3_core_exit, the event buffer is cleared regardless of the USB core's status, which may lead to an SMMU faults and other memory issues. if the USB core tries to access the event buffer address.
To prevent this hardware quirk on Exynos platforms, this commit ensures that the event buffer address is not cleared by software when the USB core is active during runtime suspend by checking its status before clearing the buffer address.
Cc: stable stable@kernel.org Signed-off-by: Selvarasu Ganesan selvarasu.g@samsung.com Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Link: https://lore.kernel.org/r/20240815064836.1491-1-selvarasu.g@samsung.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Lin Ruifeng linruifeng4@huawei.com --- drivers/usb/dwc3/core.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index aa1f69464126..384175b3135c 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -435,9 +435,17 @@ int dwc3_event_buffers_setup(struct dwc3 *dwc) void dwc3_event_buffers_cleanup(struct dwc3 *dwc) { struct dwc3_event_buffer *evt; + u32 reg;
if (!dwc->ev_buf) return; + /* + * Exynos platforms may not be able to access event buffer if the + * controller failed to halt on dwc3_core_exit(). + */ + reg = dwc3_readl(dwc->regs, DWC3_DSTS); + if (!(reg & DWC3_DSTS_DEVCTRLHLT)) + return;
evt = dwc->ev_buf;
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