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util/nvmutil: use O_NONBLOCK on /dev/[u]random

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on some systems, it is otherwise blocking, but blocking
can be disabled, making access more reliable.

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-10 14:25:43 +00:00
parent c953228bb0
commit 4bc7ba1e4b
1 changed files with 10 additions and 2 deletions
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util/nvmutil/nvmutil.c
+10 -2
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@@ -101,6 +101,10 @@ 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 0
#endif
/*
* Sanitize command tables.
*/
@@ -708,11 +712,15 @@ static void
open_dev_urandom(void)
{
rname = newrandom;
if ((urandom_fd = open(rname, O_RDONLY | O_BINARY)) != -1)
urandom_fd = open(rname, O_RDONLY | O_BINARY | O_NONBLOCK);
if (urandom_fd != -1)
return;
/*
* Fall back to /dev/random on very old Unix.
*
* We must reset errno, to remove stale state
* set by reading /dev/urandom
*/
fprintf(stderr, "Can't open %s (will use %s instead)\n",
@@ -721,7 +729,7 @@ open_dev_urandom(void)
errno = 0;
rname = oldrandom;
xopen(&urandom_fd, rname, O_RDONLY | O_BINARY, &gbe_st);
xopen(&urandom_fd, rname, O_RDONLY | O_BINARY | O_NONBLOCK, &gbe_st);
}
static void