From: Josef Bacik <josef@toxicpanda.com>
To: hch@lst.de, viro@ZenIV.linux.org.uk,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
willy@infradead.org, kernel-team@fb.com
Subject: [PATCH 4/6] sysctl: make proc_put_long() use scnprintf
Date: Thu, 13 Aug 2020 17:04:09 -0400 [thread overview]
Message-ID: <20200813210411.905010-5-josef@toxicpanda.com> (raw)
In-Reply-To: <20200813210411.905010-1-josef@toxicpanda.com>
Now that we're passing down a kernel buffer with enough space to account
for an extra NULL terminator, go ahead and use scnprintf() to print out
a long in proc_put_long(). count here includes NULL terminator slot in
the buffer, so we will get the correct behavior we're looking for.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
kernel/sysctl.c | 15 +++++----------
1 file changed, 5 insertions(+), 10 deletions(-)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 287862f91717..d8cc8737f58f 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -484,6 +484,7 @@ static int proc_get_long(char **buf, size_t *size,
return 0;
}
+#undef TMPBUFLEN
/**
* proc_put_long - converts an integer to a decimal ASCII formatted string
@@ -498,18 +499,12 @@ static int proc_get_long(char **buf, size_t *size,
*/
static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
{
- int len;
- char tmp[TMPBUFLEN], *p = tmp;
+ size_t ret;
- sprintf(p, "%s%lu", neg ? "-" : "", val);
- len = strlen(tmp);
- if (len > *size)
- len = *size;
- memcpy(*buf, tmp, len);
- *size -= len;
- *buf += len;
+ ret = scnprintf(*buf, *size, "%s%lu", neg ? "-" : "", val);
+ *size -= ret;
+ *buf += ret;
}
-#undef TMPBUFLEN
static void proc_put_char(void **buf, size_t *size, char c)
{
--
2.24.1
next prev parent reply other threads:[~2020-08-13 21:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-13 21:04 [PATCH 0/6] Some buffer management fixes for proc Josef Bacik
2020-08-13 21:04 ` [PATCH 1/6] proc: use vmalloc for our kernel buffer Josef Bacik
2020-09-01 15:14 ` Christoph Hellwig
2020-08-13 21:04 ` [PATCH 2/6] tree-wide: rename vmemdup_user to kvmemdup_user Josef Bacik
2020-09-01 15:14 ` Christoph Hellwig
2020-08-13 21:04 ` [PATCH 3/6] proc: allocate count + 1 for our read buffer Josef Bacik
2020-09-01 15:14 ` Christoph Hellwig
2020-08-13 21:04 ` Josef Bacik [this message]
2020-09-01 15:15 ` [PATCH 4/6] sysctl: make proc_put_long() use scnprintf Christoph Hellwig
2020-08-13 21:04 ` [PATCH 5/6] parport: rework procfs handlers to take advantage of the new buffer Josef Bacik
2020-09-01 15:15 ` Christoph Hellwig
2020-08-13 21:04 ` [PATCH 6/6] sunrpc: rework proc " Josef Bacik
2020-09-01 15:15 ` Christoph Hellwig
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