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util/nvmutil: more secure mkstemp

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try a few more times until success

explicitly return EEXIST when needed

we try multiple times and check more
thoroughly if a file exists, thus
reducing the risk of race conditions

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-16 16:12:02 +00:00
parent e5e107d8cd
commit f62ac24d8f
1 changed files with 11 additions and 4 deletions
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15
util/nvmutil/nvmutil.c
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@@ -3009,12 +3009,19 @@ static int
x_i_mkstemp(char *template)
{
int fd;
int i;
if (mktemp(template) == NULL)
return -1;
for (i = 0; i < 10; i++) {
if (mktemp(template) == NULL)
return -1;
fd = open(template, O_RDWR | O_CREAT | O_EXCL, 0600);
return fd;
fd = open(template, O_RDWR | O_CREAT | O_EXCL, 0600);
if (fd >= 0)
return fd;
}
errno = EEXIST;
return -1;
}
static char *