5.10-stable review patch. If anyone has any objections, please let me know.
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From: Amir Mohammad Jahangirzad a.jahangirzad@gmail.com
[ Upstream commit cdfa1304657d6f23be8fd2bb0516380a3c89034e ]
sprintf() is discouraged for use with bounded destination buffers as it does not prevent buffer overflows when the formatted output exceeds the destination buffer size. snprintf() is a safer alternative as it limits the number of bytes written and ensures NUL-termination.
Replace sprintf() with snprintf() for copying the debug string into a temporary buffer, using ORANGEFS_MAX_DEBUG_STRING_LEN as the maximum size to ensure safe formatting and prevent memory corruption in edge cases.
EDIT: After this patch sat on linux-next for a few days, Dan Carpenter saw it and suggested that I use scnprintf instead of snprintf. I made the change and retested.
Signed-off-by: Amir Mohammad Jahangirzad a.jahangirzad@gmail.com Signed-off-by: Mike Marshall hubcap@omnibond.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/orangefs/orangefs-debugfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/orangefs/orangefs-debugfs.c b/fs/orangefs/orangefs-debugfs.c index b57140ebfad0..cd4bfd92ebd6 100644 --- a/fs/orangefs/orangefs-debugfs.c +++ b/fs/orangefs/orangefs-debugfs.c @@ -354,7 +354,7 @@ static ssize_t orangefs_debug_read(struct file *file, goto out;
mutex_lock(&orangefs_debug_lock); - sprintf_ret = sprintf(buf, "%s", (char *)file->private_data); + sprintf_ret = scnprintf(buf, ORANGEFS_MAX_DEBUG_STRING_LEN, "%s", (char *)file->private_data); mutex_unlock(&orangefs_debug_lock);
read_ret = simple_read_from_buffer(ubuf, count, ppos, buf, sprintf_ret);