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86 lines
2.2 KiB
86 lines
2.2 KiB
From 4c39cb09735a494099fba0474d25ff26800de952 Mon Sep 17 00:00:00 2001
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From: Lee Duncan <lduncan@suse.com>
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Date: Wed, 29 Jan 2020 12:47:16 -0800
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Subject: [PATCH] Do not ignore write() return value.
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Some distros set the warn_unused_result attribute for the write()
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system call, so check the return value.
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---
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pki.c | 37 ++++++++++++++++++++++++++++++++-----
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1 file changed, 32 insertions(+), 5 deletions(-)
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diff --git a/pki.c b/pki.c
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index 486d9bb..57ea664 100644
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--- a/pki.c
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+++ b/pki.c
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@@ -9,12 +9,13 @@
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#include <unistd.h>
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#include <limits.h>
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#include "config.h"
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+#include <fcntl.h>
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+#include <assert.h>
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#ifdef WITH_SECURITY
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#include <openssl/pem.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#endif
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-#include <fcntl.h>
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#include <libisns/isns.h>
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#include "security.h"
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#include <libisns/util.h>
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@@ -431,17 +432,43 @@ isns_dsa_load_params(const char *filename)
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return dsa;
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}
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+/*
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+ * write one 'status' character to stdout
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+ */
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+static void
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+write_status_byte(int ch)
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+{
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+ static int stdout_fd = 1; /* fileno(stdout) */
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+ char buf[2];
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+ int res;
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+
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+ /*
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+ * We don't actually care about the return value here, since
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+ * we are just dumping a status byte to stdout, but
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+ * some linux distrubutions set the warn_unused_result attribute
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+ * for the write() API, so we might as well use the return value
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+ * to make sure the write command isn't broken.
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+ */
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+ assert(ch);
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+ buf[0] = ch;
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+ buf[1] = '\0';
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+ res = write(stdout_fd, buf, 1);
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+ assert(res == 1);
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+}
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+
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static int
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isns_dsa_param_gen_callback(int stage,
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__attribute__((unused))int index,
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__attribute__((unused))void *dummy)
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{
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if (stage == 0)
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- write(1, "+", 1);
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+ write_status_byte('+');
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else if (stage == 1)
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- write(1, ".", 1);
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+ write_status_byte('.');
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else if (stage == 2)
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- write(1, "/", 1);
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+ write_status_byte('/');
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+
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+ /* as a callback, we must return a value, so just return success */
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return 0;
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}
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@@ -478,7 +505,7 @@ isns_dsa_init_params(const char *filename)
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dsa = DSA_generate_parameters(dsa_key_bits, NULL, 0,
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NULL, NULL, isns_dsa_param_gen_callback, NULL);
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#endif
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- write(1, "\n", 1);
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+ write_status_byte('\n');
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if (dsa == NULL) {
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isns_dsasig_report_errors("Error generating DSA parameters",
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