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util/nvmutil: lock gbe file

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-13 15:48:18 +00:00
parent afcdae1350
commit 551470cf6f
1 changed files with 20 additions and 0 deletions
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util/nvmutil/nvmutil.c
+20
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@@ -253,6 +253,7 @@ static int xstrxcmp(const char *a, const char *b, size_t maxlen);
*/ */
static void open_dev_urandom(void); static void open_dev_urandom(void);
static void open_gbe_file(void); static void open_gbe_file(void);
static void lock_gbe_file(void);
static void xopen(int *fd, const char *path, int flags, struct stat *st); static void xopen(int *fd, const char *path, int flags, struct stat *st);
/* /*
@@ -652,6 +653,7 @@ main(int argc, char *argv[])
open_dev_urandom(); open_dev_urandom();
open_gbe_file(); open_gbe_file();
lock_gbe_file();
#ifdef NVMUTIL_PLEDGE #ifdef NVMUTIL_PLEDGE
if (pledge("stdio", NULL) == -1) if (pledge("stdio", NULL) == -1)
@@ -880,6 +882,24 @@ open_gbe_file(void)
} }
} }
static void
lock_gbe_file(void)
{
struct flock fl;
memset(&fl, 0, sizeof(fl));
if (command[cmd_index].flags == O_RDONLY)
fl.l_type = F_RDLCK;
else
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_SET;
if (fcntl(gbe_fd, F_SETLK, &fl) == -1)
err(errno, "file is locked by another process");
}
static void static void
xopen(int *fd_ptr, const char *path, int flags, struct stat *st) xopen(int *fd_ptr, const char *path, int flags, struct stat *st)
{ {