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psi: allow unprivileged users with CAP_SYS_RESOURCE to write psi files

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Currently only root can write files under /proc/pressure. Relax this to
allow tasks running as unprivileged users with CAP_SYS_RESOURCE to be
able to write to these files.

Signed-off-by: Josh Hunt <johunt@akamai.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Link: https://lkml.kernel.org/r/20210402025833.27599-1-johunt@akamai.com
This commit is contained in:
Josh Hunt 2021-04-01 22:58:33 -04:00 committed by Peter Zijlstra
parent 0a2b65c03e
commit 6db12ee045
1 changed files with 14 additions and 6 deletions
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20
kernel/sched/psi.c
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@ -1061,19 +1061,27 @@ static int psi_cpu_show(struct seq_file *m, void *v)
return psi_show(m, &psi_system, PSI_CPU);
}
static int psi_open(struct file *file, int (*psi_show)(struct seq_file *, void *))
{
if (file->f_mode & FMODE_WRITE && !capable(CAP_SYS_RESOURCE))
return -EPERM;
return single_open(file, psi_show, NULL);
}
static int psi_io_open(struct inode *inode, struct file *file)
{
return single_open(file, psi_io_show, NULL);
return psi_open(file, psi_io_show);
}
static int psi_memory_open(struct inode *inode, struct file *file)
{
return single_open(file, psi_memory_show, NULL);
return psi_open(file, psi_memory_show);
}
static int psi_cpu_open(struct inode *inode, struct file *file)
{
return single_open(file, psi_cpu_show, NULL);
return psi_open(file, psi_cpu_show);
}
struct psi_trigger *psi_trigger_create(struct psi_group *group,
@ -1353,9 +1361,9 @@ static int __init psi_proc_init(void)
{
if (psi_enable) {
proc_mkdir("pressure", NULL);
proc_create("pressure/io", 0, NULL, &psi_io_proc_ops);
proc_create("pressure/memory", 0, NULL, &psi_memory_proc_ops);
proc_create("pressure/cpu", 0, NULL, &psi_cpu_proc_ops);
proc_create("pressure/io", 0666, NULL, &psi_io_proc_ops);
proc_create("pressure/memory", 0666, NULL, &psi_memory_proc_ops);
proc_create("pressure/cpu", 0666, NULL, &psi_cpu_proc_ops);
}
return 0;
}