[lustre-devel] [PATCH 11/22] lustre: obdclass: fill jobid in a safe way
James Simmons
jsimmons at infradead.org
Sun Nov 20 06:16:57 PST 2022
From: Lei Feng <flei at whamcloud.com>
Ensure jobid_interpret_string() fills jobid in an atomic way.
Make sure we use the proper length. The Linux native client
got this mostly right.
WC-bug-id: https://jira.whamcloud.com/browse/LU-16251
Lustre-commit: 9a0a89520e8b57bd6 ("LU-16251 obdclass: fill jobid in a safe way")
Signed-off-by: Lei Feng <flei at whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/48915
Reviewed-by: Andreas Dilger <adilger at whamcloud.com>
Reviewed-by: Jian Yu <yujian at whamcloud.com>
Reviewed-by: Oleg Drokin <green at whamcloud.com>
Signed-off-by: James Simmons <jsimmons at infradead.org>
---
fs/lustre/obdclass/jobid.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/fs/lustre/obdclass/jobid.c b/fs/lustre/obdclass/jobid.c
index da1af51..77ea5b2 100644
--- a/fs/lustre/obdclass/jobid.c
+++ b/fs/lustre/obdclass/jobid.c
@@ -308,7 +308,8 @@ static int jobid_interpret_string(const char *jobfmt, char *jobid,
*/
int lustre_get_jobid(char *jobid, size_t joblen)
{
- char tmp_jobid[LUSTRE_JOBID_SIZE] = "";
+ char id[LUSTRE_JOBID_SIZE] = "";
+ int len = min_t(int, joblen, LUSTRE_JOBID_SIZE);
if (unlikely(joblen < 2)) {
if (joblen == 1)
@@ -324,14 +325,14 @@ int lustre_get_jobid(char *jobid, size_t joblen)
if (strcmp(obd_jobid_var, JOBSTATS_NODELOCAL) == 0 ||
strnstr(obd_jobid_name, "%j", LUSTRE_JOBID_SIZE)) {
int rc2 = jobid_interpret_string(obd_jobid_name,
- tmp_jobid, joblen);
+ id, len);
if (!rc2)
goto out_cache_jobid;
}
/* Use process name + fsuid as jobid */
if (strcmp(obd_jobid_var, JOBSTATS_PROCNAME_UID) == 0) {
- snprintf(tmp_jobid, LUSTRE_JOBID_SIZE, "%s.%u",
+ snprintf(id, LUSTRE_JOBID_SIZE, "%s.%u",
current->comm,
from_kuid(&init_user_ns, current_fsuid()));
goto out_cache_jobid;
@@ -343,7 +344,7 @@ int lustre_get_jobid(char *jobid, size_t joblen)
rcu_read_lock();
jid = jobid_current();
if (jid)
- strlcpy(tmp_jobid, jid, sizeof(tmp_jobid));
+ strlcpy(id, jid, sizeof(id));
rcu_read_unlock();
goto out_cache_jobid;
}
@@ -352,8 +353,8 @@ int lustre_get_jobid(char *jobid, size_t joblen)
out_cache_jobid:
/* Only replace the job ID if it changed. */
- if (strcmp(jobid, tmp_jobid) != 0)
- strcpy(jobid, tmp_jobid);
+ if (strcmp(jobid, id) != 0)
+ strcpy(jobid, id);
return 0;
}
--
1.8.3.1
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