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util/nvmuttil: don't use arc4random

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i have urandom again. it's enough

the fallback rand implementation
is used if needed

now i don't have to worry about any
weird version of unix from 1992 and
deal with weird hacks. in fact, with
this change, my code will probably
compile on irix now

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-15 21:09:33 +00:00
parent 04b215dd6d
commit 824fade5e9
1 changed files with 8 additions and 44 deletions
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util/nvmutil/nvmutil.c
+8 -44
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@@ -38,18 +38,6 @@
#define OFF_RESET 1
#endif
/*
* NOTE: older Linux lacked arc4random.
* added in glibc 2.36. Just pass HAVE_ARC4RANDOM_BUF=0
* at build time if you need old Linux / other libc.
*/
#if defined(__OpenBSD__) || defined(__FreeBSD__) || \
defined(__NetBSD__) || defined(__APPLE__)
#ifndef HAVE_ARC4RANDOM_BUF
#define HAVE_ARC4RANDOM_BUF 1
#endif
#endif
/*
* I/O config (build-time)
*
@@ -379,11 +367,8 @@ static void set_mac_nib(size_t mac_str_pos,
size_t mac_byte_pos, size_t mac_nib_pos);
static ushort hextonum(char ch_s);
static ushort rhex(void);
#if !defined(HAVE_ARC4RANDOM_BUF) || \
(HAVE_ARC4RANDOM_BUF) < 1
static ushort read_urandom(void);
static ulong entropy_jitter(void);
#endif
static void write_mac_part(size_t partnum);
/*
@@ -698,11 +683,6 @@ static ino_t gbe_ino;
static dev_t tmp_dev;
static ino_t tmp_ino;
#if defined(HAVE_ARC4RANDOM_BUF) && \
(HAVE_ARC4RANDOM_BUF) > 0
void arc4random_buf(void *buf, size_t n);
#endif
/*
* No need to declare feature
* macros. I jus declare the
@@ -732,8 +712,8 @@ main(int argc, char *argv[])
#ifdef NVMUTIL_UNVEIL
if (pledge("stdio flock rpath wpath cpath unveil", NULL) == -1)
err(errno, "pledge, unveil");
if (unveil("/dev/null", "r") == -1)
err(errno, "unveil: /dev/null");
if (unveil("/dev/urandom", "r") == -1)
err(errno, "unveil: /dev/urandom");
#else
if (pledge("stdio flock rpath wpath cpath", NULL) == -1)
err(errno, "pledge");
@@ -764,10 +744,7 @@ main(int argc, char *argv[])
err(errno, "pledge (kill unveil)");
#endif
#if !defined(HAVE_ARC4RANDOM_BUF) || \
(HAVE_ARC4RANDOM_BUF) < 1
srand((uint)(time(NULL) ^ getpid()));
#endif
open_gbe_file();
@@ -1349,22 +1326,6 @@ hextonum(char ch_s)
return 16; /* invalid character */
}
#if defined(HAVE_ARC4RANDOM_BUF) && \
(HAVE_ARC4RANDOM_BUF) > 0
static ushort
rhex(void)
{
static u8 num[12];
static size_t n = 0;
if (!n) {
n = 12;
arc4random_buf(num, 12);
}
return num[--n] & 0xf;
}
#else
static ushort
rhex(void)
{
@@ -1373,10 +1334,14 @@ rhex(void)
static ulong counter = 0;
ushort r;
/* Read /dev/urandom
* if possible */
r = read_urandom();
if (r < 16)
return r;
/* Fallback */
gettimeofday(&tv, NULL);
mix = (ulong)tv.tv_sec
@@ -1403,7 +1368,7 @@ read_urandom(void)
static int fd = -1;
static ssize_t n = -1;
static u8 r[12];
static u8 r[256];
if (fd < 0) {
@@ -1415,7 +1380,7 @@ read_urandom(void)
if (n < 0) {
n = rw_file_exact(fd, r, 12, 0, IO_READ,
n = rw_file_exact(fd, r, 256, 0, IO_READ,
LOOP_EAGAIN, LOOP_EINTR, 2, OFF_ERR);
if (n == 0)
@@ -1456,7 +1421,6 @@ entropy_jitter(void)
return mix;
}
#endif
static void
write_mac_part(size_t partnum)