[PATCH 5.13 18/22] xhci: fix even more unsafe memory usage in xhci tracing
From: Greg Kroah-Hartman
Date: Fri Sep 10 2021 - 08:32:48 EST
From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
commit 4843b4b5ec64b875a5e334f280508f1f75e7d3e4 upstream.
Removes static char buffer usage in the following decode functions:
xhci_decode_ctrl_ctx()
xhci_decode_slot_context()
xhci_decode_usbsts()
xhci_decode_doorbell()
xhci_decode_ep_context()
Caller must provide a buffer to use.
In tracing use __get_str() as recommended to pass buffer.
Minor changes are needed in other xhci code as these functions are also
used elsewhere
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210820123503.2605901-3-mathias.nyman@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-debugfs.c | 8 ++++++--
drivers/usb/host/xhci-ring.c | 3 ++-
drivers/usb/host/xhci-trace.h | 18 +++++++++++-------
drivers/usb/host/xhci.h | 21 ++++++++-------------
4 files changed, 27 insertions(+), 23 deletions(-)
--- a/drivers/usb/host/xhci-debugfs.c
+++ b/drivers/usb/host/xhci-debugfs.c
@@ -260,11 +260,13 @@ static int xhci_slot_context_show(struct
struct xhci_slot_ctx *slot_ctx;
struct xhci_slot_priv *priv = s->private;
struct xhci_virt_device *dev = priv->dev;
+ char str[XHCI_MSG_MAX];
xhci = hcd_to_xhci(bus_to_hcd(dev->udev->bus));
slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx);
seq_printf(s, "%pad: %s\n", &dev->out_ctx->dma,
- xhci_decode_slot_context(le32_to_cpu(slot_ctx->dev_info),
+ xhci_decode_slot_context(str,
+ le32_to_cpu(slot_ctx->dev_info),
le32_to_cpu(slot_ctx->dev_info2),
le32_to_cpu(slot_ctx->tt_info),
le32_to_cpu(slot_ctx->dev_state)));
@@ -280,6 +282,7 @@ static int xhci_endpoint_context_show(st
struct xhci_ep_ctx *ep_ctx;
struct xhci_slot_priv *priv = s->private;
struct xhci_virt_device *dev = priv->dev;
+ char str[XHCI_MSG_MAX];
xhci = hcd_to_xhci(bus_to_hcd(dev->udev->bus));
@@ -287,7 +290,8 @@ static int xhci_endpoint_context_show(st
ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
dma = dev->out_ctx->dma + (ep_index + 1) * CTX_SIZE(xhci->hcc_params);
seq_printf(s, "%pad: %s\n", &dma,
- xhci_decode_ep_context(le32_to_cpu(ep_ctx->ep_info),
+ xhci_decode_ep_context(str,
+ le32_to_cpu(ep_ctx->ep_info),
le32_to_cpu(ep_ctx->ep_info2),
le64_to_cpu(ep_ctx->deq),
le32_to_cpu(ep_ctx->tx_info)));
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1212,6 +1212,7 @@ void xhci_stop_endpoint_command_watchdog
struct xhci_hcd *xhci = ep->xhci;
unsigned long flags;
u32 usbsts;
+ char str[XHCI_MSG_MAX];
spin_lock_irqsave(&xhci->lock, flags);
@@ -1225,7 +1226,7 @@ void xhci_stop_endpoint_command_watchdog
usbsts = readl(&xhci->op_regs->status);
xhci_warn(xhci, "xHCI host not responding to stop endpoint command.\n");
- xhci_warn(xhci, "USBSTS:%s\n", xhci_decode_usbsts(usbsts));
+ xhci_warn(xhci, "USBSTS:%s\n", xhci_decode_usbsts(str, usbsts));
ep->ep_state &= ~EP_STOP_CMD_PENDING;
--- a/drivers/usb/host/xhci-trace.h
+++ b/drivers/usb/host/xhci-trace.h
@@ -323,6 +323,7 @@ DECLARE_EVENT_CLASS(xhci_log_ep_ctx,
__field(u32, info2)
__field(u64, deq)
__field(u32, tx_info)
+ __dynamic_array(char, str, XHCI_MSG_MAX)
),
TP_fast_assign(
__entry->info = le32_to_cpu(ctx->ep_info);
@@ -330,8 +331,8 @@ DECLARE_EVENT_CLASS(xhci_log_ep_ctx,
__entry->deq = le64_to_cpu(ctx->deq);
__entry->tx_info = le32_to_cpu(ctx->tx_info);
),
- TP_printk("%s", xhci_decode_ep_context(__entry->info,
- __entry->info2, __entry->deq, __entry->tx_info)
+ TP_printk("%s", xhci_decode_ep_context(__get_str(str),
+ __entry->info, __entry->info2, __entry->deq, __entry->tx_info)
)
);
@@ -368,6 +369,7 @@ DECLARE_EVENT_CLASS(xhci_log_slot_ctx,
__field(u32, info2)
__field(u32, tt_info)
__field(u32, state)
+ __dynamic_array(char, str, XHCI_MSG_MAX)
),
TP_fast_assign(
__entry->info = le32_to_cpu(ctx->dev_info);
@@ -375,9 +377,9 @@ DECLARE_EVENT_CLASS(xhci_log_slot_ctx,
__entry->tt_info = le64_to_cpu(ctx->tt_info);
__entry->state = le32_to_cpu(ctx->dev_state);
),
- TP_printk("%s", xhci_decode_slot_context(__entry->info,
- __entry->info2, __entry->tt_info,
- __entry->state)
+ TP_printk("%s", xhci_decode_slot_context(__get_str(str),
+ __entry->info, __entry->info2,
+ __entry->tt_info, __entry->state)
)
);
@@ -432,12 +434,13 @@ DECLARE_EVENT_CLASS(xhci_log_ctrl_ctx,
TP_STRUCT__entry(
__field(u32, drop)
__field(u32, add)
+ __dynamic_array(char, str, XHCI_MSG_MAX)
),
TP_fast_assign(
__entry->drop = le32_to_cpu(ctrl_ctx->drop_flags);
__entry->add = le32_to_cpu(ctrl_ctx->add_flags);
),
- TP_printk("%s", xhci_decode_ctrl_ctx(__entry->drop, __entry->add)
+ TP_printk("%s", xhci_decode_ctrl_ctx(__get_str(str), __entry->drop, __entry->add)
)
);
@@ -555,13 +558,14 @@ DECLARE_EVENT_CLASS(xhci_log_doorbell,
TP_STRUCT__entry(
__field(u32, slot)
__field(u32, doorbell)
+ __dynamic_array(char, str, XHCI_MSG_MAX)
),
TP_fast_assign(
__entry->slot = slot;
__entry->doorbell = doorbell;
),
TP_printk("Ring doorbell for %s",
- xhci_decode_doorbell(__entry->slot, __entry->doorbell)
+ xhci_decode_doorbell(__get_str(str), __entry->slot, __entry->doorbell)
)
);
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -2452,10 +2452,9 @@ static inline const char *xhci_decode_tr
return str;
}
-static inline const char *xhci_decode_ctrl_ctx(unsigned long drop,
- unsigned long add)
+static inline const char *xhci_decode_ctrl_ctx(char *str,
+ unsigned long drop, unsigned long add)
{
- static char str[1024];
unsigned int bit;
int ret = 0;
@@ -2481,10 +2480,9 @@ static inline const char *xhci_decode_ct
return str;
}
-static inline const char *xhci_decode_slot_context(u32 info, u32 info2,
- u32 tt_info, u32 state)
+static inline const char *xhci_decode_slot_context(char *str,
+ u32 info, u32 info2, u32 tt_info, u32 state)
{
- static char str[1024];
u32 speed;
u32 hub;
u32 mtt;
@@ -2614,9 +2612,8 @@ static inline const char *xhci_decode_po
return str;
}
-static inline const char *xhci_decode_usbsts(u32 usbsts)
+static inline const char *xhci_decode_usbsts(char *str, u32 usbsts)
{
- static char str[256];
int ret = 0;
if (usbsts == ~(u32)0)
@@ -2643,9 +2640,8 @@ static inline const char *xhci_decode_us
return str;
}
-static inline const char *xhci_decode_doorbell(u32 slot, u32 doorbell)
+static inline const char *xhci_decode_doorbell(char *str, u32 slot, u32 doorbell)
{
- static char str[256];
u8 ep;
u16 stream;
int ret;
@@ -2712,10 +2708,9 @@ static inline const char *xhci_ep_type_s
}
}
-static inline const char *xhci_decode_ep_context(u32 info, u32 info2, u64 deq,
- u32 tx_info)
+static inline const char *xhci_decode_ep_context(char *str, u32 info,
+ u32 info2, u64 deq, u32 tx_info)
{
- static char str[1024];
int ret;
u32 esit;