xhci: fix unsafe memory usage in xhci tracing
commit cbf286e8ef8337308c259ff5b9ce2e74d403be5a upstream. Removes static char buffer usage in the following decode functions: xhci_decode_trb() xhci_decode_ptortsc() Caller must provide a buffer to use. In tracing use __get_str() as recommended to pass buffer. Minor chanes are needed in xhci debugfs code as these functions are also used there. Changes include moving XHCI_MSG_MAX definititon from xhci-trace.h to xhci.h Cc: <stable@vger.kernel.org> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Link: https://lore.kernel.org/r/20210820123503.2605901-2-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman
Greg Kroah-Hartman
parent
e00d39ca92
commit
d31a4c35b9
@ -197,12 +197,13 @@ static void xhci_ring_dump_segment(struct seq_file *s,
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int i;
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dma_addr_t dma;
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union xhci_trb *trb;
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char str[XHCI_MSG_MAX];
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for (i = 0; i < TRBS_PER_SEGMENT; i++) {
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trb = &seg->trbs[i];
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dma = seg->dma + i * sizeof(*trb);
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seq_printf(s, "%pad: %s\n", &dma,
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xhci_decode_trb(le32_to_cpu(trb->generic.field[0]),
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xhci_decode_trb(str, XHCI_MSG_MAX, le32_to_cpu(trb->generic.field[0]),
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le32_to_cpu(trb->generic.field[1]),
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le32_to_cpu(trb->generic.field[2]),
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le32_to_cpu(trb->generic.field[3])));
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@ -340,9 +341,10 @@ static int xhci_portsc_show(struct seq_file *s, void *unused)
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{
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struct xhci_port *port = s->private;
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u32 portsc;
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char str[XHCI_MSG_MAX];
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portsc = readl(port->addr);
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seq_printf(s, "%s\n", xhci_decode_portsc(portsc));
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seq_printf(s, "%s\n", xhci_decode_portsc(str, portsc));
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return 0;
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}
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@ -25,8 +25,6 @@
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#include "xhci.h"
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#include "xhci-dbgcap.h"
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#define XHCI_MSG_MAX 500
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DECLARE_EVENT_CLASS(xhci_log_msg,
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TP_PROTO(struct va_format *vaf),
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TP_ARGS(vaf),
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@ -122,6 +120,7 @@ DECLARE_EVENT_CLASS(xhci_log_trb,
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__field(u32, field1)
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__field(u32, field2)
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__field(u32, field3)
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__dynamic_array(char, str, XHCI_MSG_MAX)
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),
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TP_fast_assign(
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__entry->type = ring->type;
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@ -131,7 +130,7 @@ DECLARE_EVENT_CLASS(xhci_log_trb,
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__entry->field3 = le32_to_cpu(trb->field[3]);
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),
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TP_printk("%s: %s", xhci_ring_type_string(__entry->type),
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xhci_decode_trb(__entry->field0, __entry->field1,
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xhci_decode_trb(__get_str(str), XHCI_MSG_MAX, __entry->field0, __entry->field1,
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__entry->field2, __entry->field3)
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)
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);
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@ -523,6 +522,7 @@ DECLARE_EVENT_CLASS(xhci_log_portsc,
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TP_STRUCT__entry(
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__field(u32, portnum)
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__field(u32, portsc)
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__dynamic_array(char, str, XHCI_MSG_MAX)
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),
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TP_fast_assign(
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__entry->portnum = portnum;
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@ -530,7 +530,7 @@ DECLARE_EVENT_CLASS(xhci_log_portsc,
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),
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TP_printk("port-%d: %s",
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__entry->portnum,
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xhci_decode_portsc(__entry->portsc)
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xhci_decode_portsc(__get_str(str), __entry->portsc)
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)
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);
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@ -22,6 +22,9 @@
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#include "xhci-ext-caps.h"
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#include "pci-quirks.h"
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/* max buffer size for trace and debug messages */
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#define XHCI_MSG_MAX 500
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/* xHCI PCI Configuration Registers */
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#define XHCI_SBRN_OFFSET (0x60)
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@ -2217,15 +2220,14 @@ static inline char *xhci_slot_state_string(u32 state)
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}
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}
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static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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u32 field3)
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static inline const char *xhci_decode_trb(char *str, size_t size,
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u32 field0, u32 field1, u32 field2, u32 field3)
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{
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static char str[256];
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int type = TRB_FIELD_TO_TYPE(field3);
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switch (type) {
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case TRB_LINK:
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sprintf(str,
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snprintf(str, size,
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"LINK %08x%08x intr %d type '%s' flags %c:%c:%c:%c",
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field1, field0, GET_INTR_TARGET(field2),
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xhci_trb_type_string(type),
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@ -2242,7 +2244,7 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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case TRB_HC_EVENT:
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case TRB_DEV_NOTE:
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case TRB_MFINDEX_WRAP:
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sprintf(str,
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snprintf(str, size,
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"TRB %08x%08x status '%s' len %d slot %d ep %d type '%s' flags %c:%c",
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field1, field0,
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xhci_trb_comp_code_string(GET_COMP_CODE(field2)),
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@ -2255,7 +2257,8 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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break;
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case TRB_SETUP:
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sprintf(str, "bRequestType %02x bRequest %02x wValue %02x%02x wIndex %02x%02x wLength %d length %d TD size %d intr %d type '%s' flags %c:%c:%c",
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snprintf(str, size,
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"bRequestType %02x bRequest %02x wValue %02x%02x wIndex %02x%02x wLength %d length %d TD size %d intr %d type '%s' flags %c:%c:%c",
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field0 & 0xff,
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(field0 & 0xff00) >> 8,
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(field0 & 0xff000000) >> 24,
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@ -2272,7 +2275,8 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_DATA:
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sprintf(str, "Buffer %08x%08x length %d TD size %d intr %d type '%s' flags %c:%c:%c:%c:%c:%c:%c",
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snprintf(str, size,
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"Buffer %08x%08x length %d TD size %d intr %d type '%s' flags %c:%c:%c:%c:%c:%c:%c",
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field1, field0, TRB_LEN(field2), GET_TD_SIZE(field2),
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GET_INTR_TARGET(field2),
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xhci_trb_type_string(type),
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@ -2285,7 +2289,8 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_STATUS:
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sprintf(str, "Buffer %08x%08x length %d TD size %d intr %d type '%s' flags %c:%c:%c:%c",
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snprintf(str, size,
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"Buffer %08x%08x length %d TD size %d intr %d type '%s' flags %c:%c:%c:%c",
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field1, field0, TRB_LEN(field2), GET_TD_SIZE(field2),
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GET_INTR_TARGET(field2),
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xhci_trb_type_string(type),
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@ -2298,7 +2303,7 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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case TRB_ISOC:
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case TRB_EVENT_DATA:
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case TRB_TR_NOOP:
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sprintf(str,
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snprintf(str, size,
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"Buffer %08x%08x length %d TD size %d intr %d type '%s' flags %c:%c:%c:%c:%c:%c:%c:%c",
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field1, field0, TRB_LEN(field2), GET_TD_SIZE(field2),
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GET_INTR_TARGET(field2),
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@ -2315,21 +2320,21 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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case TRB_CMD_NOOP:
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case TRB_ENABLE_SLOT:
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sprintf(str,
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snprintf(str, size,
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"%s: flags %c",
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xhci_trb_type_string(type),
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_DISABLE_SLOT:
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case TRB_NEG_BANDWIDTH:
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sprintf(str,
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snprintf(str, size,
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"%s: slot %d flags %c",
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xhci_trb_type_string(type),
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TRB_TO_SLOT_ID(field3),
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_ADDR_DEV:
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sprintf(str,
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snprintf(str, size,
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"%s: ctx %08x%08x slot %d flags %c:%c",
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xhci_trb_type_string(type),
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field1, field0,
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@ -2338,7 +2343,7 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_CONFIG_EP:
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sprintf(str,
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snprintf(str, size,
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"%s: ctx %08x%08x slot %d flags %c:%c",
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xhci_trb_type_string(type),
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field1, field0,
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@ -2347,7 +2352,7 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_EVAL_CONTEXT:
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sprintf(str,
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snprintf(str, size,
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"%s: ctx %08x%08x slot %d flags %c",
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xhci_trb_type_string(type),
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field1, field0,
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@ -2355,7 +2360,7 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_RESET_EP:
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sprintf(str,
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snprintf(str, size,
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"%s: ctx %08x%08x slot %d ep %d flags %c:%c",
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xhci_trb_type_string(type),
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field1, field0,
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@ -2376,7 +2381,7 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_SET_DEQ:
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sprintf(str,
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snprintf(str, size,
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"%s: deq %08x%08x stream %d slot %d ep %d flags %c",
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xhci_trb_type_string(type),
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field1, field0,
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@ -2387,14 +2392,14 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_RESET_DEV:
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sprintf(str,
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snprintf(str, size,
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"%s: slot %d flags %c",
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xhci_trb_type_string(type),
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TRB_TO_SLOT_ID(field3),
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_FORCE_EVENT:
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sprintf(str,
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snprintf(str, size,
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"%s: event %08x%08x vf intr %d vf id %d flags %c",
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xhci_trb_type_string(type),
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field1, field0,
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@ -2403,14 +2408,14 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_SET_LT:
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sprintf(str,
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snprintf(str, size,
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"%s: belt %d flags %c",
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xhci_trb_type_string(type),
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TRB_TO_BELT(field3),
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_GET_BW:
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sprintf(str,
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snprintf(str, size,
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"%s: ctx %08x%08x slot %d speed %d flags %c",
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xhci_trb_type_string(type),
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field1, field0,
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@ -2419,7 +2424,7 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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case TRB_FORCE_HEADER:
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sprintf(str,
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snprintf(str, size,
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"%s: info %08x%08x%08x pkt type %d roothub port %d flags %c",
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xhci_trb_type_string(type),
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field2, field1, field0 & 0xffffffe0,
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@ -2428,7 +2433,7 @@ static inline const char *xhci_decode_trb(u32 field0, u32 field1, u32 field2,
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field3 & TRB_CYCLE ? 'C' : 'c');
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break;
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default:
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sprintf(str,
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snprintf(str, size,
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"type '%s' -> raw %08x %08x %08x %08x",
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xhci_trb_type_string(type),
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field0, field1, field2, field3);
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@ -2553,9 +2558,8 @@ static inline const char *xhci_portsc_link_state_string(u32 portsc)
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return "Unknown";
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}
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static inline const char *xhci_decode_portsc(u32 portsc)
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static inline const char *xhci_decode_portsc(char *str, u32 portsc)
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{
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static char str[256];
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int ret;
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ret = sprintf(str, "%s %s %s Link:%s PortSpeed:%d ",
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