x86/resctrl: Avoid overflow in MB settings in bw_validate()

The resctrl schemata file supports specifying memory bandwidth associated with
the Memory Bandwidth Allocation (MBA) feature via a percentage (this is the
default) or bandwidth in MiBps (when resctrl is mounted with the "mba_MBps"
option).

The allowed range for the bandwidth percentage is from
/sys/fs/resctrl/info/MB/min_bandwidth to 100, using a granularity of
/sys/fs/resctrl/info/MB/bandwidth_gran. The supported range for the MiBps
bandwidth is 0 to U32_MAX.

There are two issues with parsing of MiBps memory bandwidth:

* The user provided MiBps is mistakenly rounded up to the granularity
  that is unique to percentage input.

* The user provided MiBps is parsed using unsigned long (thus accepting
  values up to ULONG_MAX), and then assigned to u32 that could result in
  overflow.

Do not round up the MiBps value and parse user provided bandwidth as the u32
it is intended to be. Use the appropriate kstrtou32() that can detect out of
range values.

Fixes: 8205a078ba78 ("x86/intel_rdt/mba_sc: Add schemata support")
Fixes: 6ce1560d35f6 ("x86/resctrl: Switch over to the resctrl mbps_val list")
Co-developed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Martin Kletzander <nert.pinx@gmail.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 50fa1fe9a073f5832e687d01a88c1efcc91e22c9..200d89a6402708066bf165487577e142c73b057b 100644 (file)
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -29,10 +29,10 @@
  * hardware. The allocated bandwidth percentage is rounded to the next
  * control step available on the hardware.
  */
-static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
+static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r)
 {
-       unsigned long bw;
        int ret;
+       u32 bw;
 
        /*
         * Only linear delay values is supported for current Intel SKUs.
@@ -42,16 +42,21 @@ static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
                return false;
        }
 
-       ret = kstrtoul(buf, 10, &bw);
+       ret = kstrtou32(buf, 10, &bw);
        if (ret) {
-               rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
+               rdt_last_cmd_printf("Invalid MB value %s\n", buf);
                return false;
        }
 
-       if ((bw < r->membw.min_bw || bw > r->default_ctrl) &&
-           !is_mba_sc(r)) {
-               rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
-                                   r->membw.min_bw, r->default_ctrl);
+       /* Nothing else to do if software controller is enabled. */
+       if (is_mba_sc(r)) {
+               *data = bw;
+               return true;
+       }
+
+       if (bw < r->membw.min_bw || bw > r->default_ctrl) {
+               rdt_last_cmd_printf("MB value %u out of range [%d,%d]\n",
+                                   bw, r->membw.min_bw, r->default_ctrl);
                return false;
        }
 
@@ -65,7 +70,7 @@ int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
        struct resctrl_staged_config *cfg;
        u32 closid = data->rdtgrp->closid;
        struct rdt_resource *r = s->res;
-       unsigned long bw_val;
+       u32 bw_val;
 
        cfg = &d->staged_config[s->conf_type];
        if (cfg->have_new_ctrl) {