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| author | Josh Hunt <johunt@akamai.com> | 2021-04-02 05:58:33 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-04-09 00:09:44 +0300 |
| commit | 6db12ee0456d0e369c7b59788d46e15a56ad0294 (patch) | |
| tree | f8981c6bf0d2dea9ecfcfa0cd21ad822c770db42 /kernel/sched/psi.c | |
| parent | 0a2b65c03e9b47493e1442bf9c84badc60d9bffb (diff) | |
| download | linux-6db12ee0456d0e369c7b59788d46e15a56ad0294.tar.xz | |
psi: allow unprivileged users with CAP_SYS_RESOURCE to write psi files
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
Diffstat (limited to 'kernel/sched/psi.c')
| -rw-r--r-- | kernel/sched/psi.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c index b1b00e9bd7ed..d1212f17a898 100644 --- a/kernel/sched/psi.c +++ b/kernel/sched/psi.c @@ -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; } |