linux-kernel - [PATCH v6 04/12] drivers/infiniband: make setup_ctxt always get a nul terminated task comm

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Message-Id: <20211025083315.4752-5-laoar.shao@gmail.com>
Date:   Mon, 25 Oct 2021 08:33:07 +0000
From:   Yafang Shao <laoar.shao@...il.com>
To:     akpm@...ux-foundation.org, keescook@...omium.org,
        rostedt@...dmis.org, mathieu.desnoyers@...icios.com,
        arnaldo.melo@...il.com, pmladek@...e.com, peterz@...radead.org,
        viro@...iv.linux.org.uk, valentin.schneider@....com,
        qiang.zhang@...driver.com, robdclark@...omium.org,
        christian@...uner.io, dietmar.eggemann@....com, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        davem@...emloft.net, kuba@...nel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, dennis.dalessandro@...nelisnetworks.com,
        mike.marciniszyn@...nelisnetworks.com, dledford@...hat.com,
        jgg@...pe.ca
Cc:     linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, oliver.sang@...el.com, lkp@...el.com,
        Yafang Shao <laoar.shao@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
Subject: [PATCH v6 04/12] drivers/infiniband: make setup_ctxt always get a nul terminated task comm

Use strscpy_pad() instead of strlcpy() to make the comm always nul
terminated. As the comment above the hard-coded 16, we can replace it
with TASK_COMM_LEN, then it will adopt to the comm size change.

Signed-off-by: Yafang Shao <laoar.shao@...il.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Kees Cook <keescook@...omium.org>
Cc: Petr Mladek <pmladek@...e.com>
---
 drivers/infiniband/hw/qib/qib.h          | 2 +-
 drivers/infiniband/hw/qib/qib_file_ops.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/qib/qib.h b/drivers/infiniband/hw/qib/qib.h
index 9363bccfc6e7..a8e1c30c370f 100644
--- a/drivers/infiniband/hw/qib/qib.h
+++ b/drivers/infiniband/hw/qib/qib.h
@@ -196,7 +196,7 @@ struct qib_ctxtdata {
 	pid_t pid;
 	pid_t subpid[QLOGIC_IB_MAX_SUBCTXT];
 	/* same size as task_struct .comm[], command that opened context */
-	char comm[16];
+	char comm[TASK_COMM_LEN];
 	/* pkeys set by this use of this ctxt */
 	u16 pkeys[4];
 	/* so file ops can get at unit */
diff --git a/drivers/infiniband/hw/qib/qib_file_ops.c b/drivers/infiniband/hw/qib/qib_file_ops.c
index 63854f4b6524..7ab2b448c183 100644
--- a/drivers/infiniband/hw/qib/qib_file_ops.c
+++ b/drivers/infiniband/hw/qib/qib_file_ops.c
@@ -1321,7 +1321,7 @@ static int setup_ctxt(struct qib_pportdata *ppd, int ctxt,
 	rcd->tid_pg_list = ptmp;
 	rcd->pid = current->pid;
 	init_waitqueue_head(&dd->rcd[ctxt]->wait);
-	strlcpy(rcd->comm, current->comm, sizeof(rcd->comm));
+	strscpy_pad(rcd->comm, current->comm, sizeof(rcd->comm));
 	ctxt_fp(fp) = rcd;
 	qib_stats.sps_ctxts++;
 	dd->freectxts--;
-- 
2.17.1