bpf: fix check of allowed specifiers in bpf_trace_printk

[ Upstream commit 1efb6ee3edea57f57f9fb05dba8dcb3f7333f61f ]

A format string consisting of "%p" or "%s" followed by an invalid
specifier (e.g. "%p%\n" or "%s%") could pass the check which
would make format_decode (lib/vsprintf.c) to warn.

Fixes: 9c959c863f82 ("tracing: Allow BPF programs to call bpf_trace_printk()")
Reported-by: syzbot+1ec5c5ec949c4adaa0c4@syzkaller.appspotmail.com
Signed-off-by: Martynas Pumputis <m@lambda.lt>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 6350f64..f9dd8fd 100644 (file)
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -161,11 +161,13 @@ BPF_CALL_5(bpf_trace_printk, char *, fmt, u32, fmt_size, u64, arg1,
                        i++;
                } else if (fmt[i] == 'p' || fmt[i] == 's') {
                        mod[fmt_cnt]++;
-                       i++;
-                       if (!isspace(fmt[i]) && !ispunct(fmt[i]) && fmt[i] != 0)
+                       /* disallow any further format extensions */
+                       if (fmt[i + 1] != 0 &&
+                           !isspace(fmt[i + 1]) &&
+                           !ispunct(fmt[i + 1]))
                                return -EINVAL;
                        fmt_cnt++;
-                       if (fmt[i - 1] == 's') {
+                       if (fmt[i] == 's') {
                                if (str_seen)
                                        /* allow only one '%s' per fmt string */
                                        return -EINVAL;