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x86/intel_rdt: Return error for incorrect resource names in schemata

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When schemata parses the resource names it does not return an error if it
detects incorrect resource names and fails quietly.

This happens because for_each_enabled_rdt_resource(r) leaves "r" pointing
beyond the end of the rdt_resources_all[] array, and the check for !r->name
results in an out of bounds access.

Split the resource parsing part into a helper function to avoid the issue.

[ tglx: Made it readable by splitting the parser loop out into a function ]

Reported-by: Prakhya, Sai Praneeth <sai.praneeth.prakhya@intel.com>
Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Tested-by: Prakhya, Sai Praneeth <sai.praneeth.prakhya@intel.com>
Cc: fenghua.yu@intel.com
Cc: tony.luck@intel.com
Cc: ravi.v.shankar@intel.com
Cc: vikas.shivappa@intel.com
Link: http://lkml.kernel.org/r/1492645804-17465-4-git-send-email-vikas.shivappa@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Vikas Shivappa 2017-04-19 16:50:04 -07:00 committed by Thomas Gleixner
parent 634b0e0491
commit 4797b7dfdf
1 changed files with 15 additions and 13 deletions
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28
arch/x86/kernel/cpu/intel_rdt_schemata.c
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@ -188,6 +188,17 @@ static int update_domains(struct rdt_resource *r, int closid)
return 0;
}
static int rdtgroup_parse_resource(char *resname, char *tok, int closid)
{
struct rdt_resource *r;
for_each_enabled_rdt_resource(r) {
if (!strcmp(resname, r->name) && closid < r->num_closid)
return parse_line(tok, r);
}
return -EINVAL;
}
ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
@ -210,9 +221,10 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
closid = rdtgrp->closid;
for_each_enabled_rdt_resource(r)
for_each_enabled_rdt_resource(r) {
list_for_each_entry(dom, &r->domains, list)
dom->have_new_ctrl = false;
}
while ((tok = strsep(&buf, "\n")) != NULL) {
resname = strim(strsep(&tok, ":"));
@ -220,19 +232,9 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
ret = -EINVAL;
goto out;
}
for_each_enabled_rdt_resource(r) {
if (!strcmp(resname, r->name) &&
closid < r->num_closid) {
ret = parse_line(tok, r);
if (ret)
goto out;
break;
}
}
if (!r->name) {
ret = -EINVAL;
ret = rdtgroup_parse_resource(resname, tok, closid);
if (ret)
goto out;
}
}
for_each_enabled_rdt_resource(r) {