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util/nvmutil: better urandom portability

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-16 15:10:49 +00:00
parent e2d8734150
commit 68ef78e439
1 changed files with 9 additions and 3 deletions
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12
util/nvmutil/nvmutil.c
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@@ -305,6 +305,10 @@ typedef char static_assert_off_t_is_32[(sizeof(off_t) >= 4) ? 1 : -1];
#define O_BINARY 0
#endif
#ifndef O_NONBLOCK
#define O_NONBLOCK
#endif
#ifndef O_CLOEXEC
#define O_CLOEXEC 0
#endif
@@ -1382,9 +1386,11 @@ read_urandom(void)
if (fd < 0) {
fd = open("/dev/urandom", O_RDONLY);
if (fd < 0)
fd = open("/dev/random", O_RDONLY);
fd = open("/dev/urandom", O_RDONLY | O_NONBLOCK);
if (fd < 0) /* older openbsd */
fd = open("/dev/arandom", O_RDONLY | O_NONBLOCK);
if (fd < 0) /* super old unix (could block) */
fd = open("/dev/random", O_RDONLY | O_NONBLOCK);
if (fd < 0)
return 16;