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bpf: Support "%c" in bpf_bprintf_prepare().

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/proc/net/unix uses "%c" to print a single-byte character to escape '\0' in
the name of the abstract UNIX domain socket.  The following selftest uses
it, so this patch adds support for "%c".  Note that it does not support
wide character ("%lc" and "%llc") for simplicity.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210814015718.42704-3-kuniyu@amazon.co.jp
This commit is contained in:
Kuniyuki Iwashima 2021-08-14 10:57:16 +09:00 committed by Andrii Nakryiko
parent 2c860a43dd
commit 3478cfcfcd
1 changed files with 14 additions and 0 deletions
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14
kernel/bpf/helpers.c
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@ -907,6 +907,20 @@ int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
tmp_buf += err;
num_spec++;
continue;
} else if (fmt[i] == 'c') {
if (!tmp_buf)
goto nocopy_fmt;
if (tmp_buf_end == tmp_buf) {
err = -ENOSPC;
goto out;
}
*tmp_buf = raw_args[num_spec];
tmp_buf++;
num_spec++;
continue;
}