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x86/intel_rdt: Fix a silent failure when writing zero value schemata

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Writing an invalid schemata with no domain values (e.g., "(L3|MB):"),
results in a silent failure, i.e. the last_cmd_status returns OK,

Check for an empty value and set the result string with a proper error
message and return -EINVAL.

Before the fix:
 # mkdir /sys/fs/resctrl/p1

 # echo "L3:" > /sys/fs/resctrl/p1/schemata
 (silent failure)
 # cat /sys/fs/resctrl/info/last_cmd_status
 ok

 # echo "MB:" > /sys/fs/resctrl/p1/schemata
 (silent failure)
 # cat /sys/fs/resctrl/info/last_cmd_status
 ok

After the fix:
 # mkdir /sys/fs/resctrl/p1

 # echo "L3:" > /sys/fs/resctrl/p1/schemata
 -bash: echo: write error: Invalid argument
 # cat /sys/fs/resctrl/info/last_cmd_status
 Missing 'L3' value

 # echo "MB:" > /sys/fs/resctrl/p1/schemata
 -bash: echo: write error: Invalid argument
 # cat /sys/fs/resctrl/info/last_cmd_status
 Missing 'MB' value

[ Tony: This is an unintended side effect of the patch earlier to allow the
    	user to just write the value they want to change.  While allowing
    	user to specify less than all of the values, it also allows an
    	empty value. ]

Fixes: c4026b7b95 ("x86/intel_rdt: Implement "update" mode when writing schemata file")
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Link: https://lkml.kernel.org/r/20171110191624.20280-1-tony.luck@intel.com
This commit is contained in:
Xiaochen Shen 2017-11-10 11:16:24 -08:00 committed by Thomas Gleixner
parent 87943db7df
commit 2244645ab1
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
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@ -257,6 +257,11 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
ret = -EINVAL;
goto out;
}
if (tok[0] == '\0') {
rdt_last_cmd_printf("Missing '%s' value\n", resname);
ret = -EINVAL;
goto out;
}
ret = rdtgroup_parse_resource(resname, tok, closid);
if (ret)
goto out;