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util/nvmutil: unified urandom/gbe file reading

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like before, but with the newly correct logic

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-10 03:08:09 +00:00
parent 4131402589
commit 6402a0fbe9
1 changed files with 24 additions and 58 deletions
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82
util/nvmutil/nvmutil.c
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@@ -96,8 +96,6 @@ static void open_gbe_file(void);
static void xopen(int *fd, const char *path, int flags, struct stat *st);
static void read_gbe_file(void);
static void read_gbe_file_part(size_t part);
static void read_gbe_file_exact(int fd, uint8_t *buf, size_t len,
off_t off);
static void read_checksums(void);
static int good_checksum(size_t partnum);
static void run_cmd(size_t c);
@@ -111,10 +109,8 @@ static void set_mac_nib(size_t mac_str_pos,
size_t mac_byte_pos, size_t mac_nib_pos);
static uint16_t hextonum(char ch_s);
static uint16_t rhex(void);
#ifndef NVMUTIL_ARC4RANDOM_BUF
static ssize_t read_dev_urandom(int fd, void *buf,
size_t len);
#endif
static void read_file_exact(int fd, uint8_t *mem, size_t len,
off_t off, uint8_t plesen, const char *path);
static void write_mac_part(size_t partnum);
static void cmd_helper_dump(void);
static void print_mac_from_nvm(size_t partnum);
@@ -702,32 +698,9 @@ read_gbe_file_part(size_t p)
uint8_t *mem_offset =
gbe_mem_offset(p ^ command[cmd_index].invert, "pread");
read_gbe_file_exact(gbe_fd, mem_offset,
gbe_rw_size, gbe_file_offset(p, "pread"));
}
static void
read_gbe_file_exact(int fd,
uint8_t *buf, size_t len, off_t off)
{
ssize_t rval = -1;
ssize_t rc = 0;
if (fd == -1)
err(ECANCELED, "Trying to open bad fd: %s", fname);
for (rc = 0; rc != (ssize_t)len; rc += rval) {
if ((rval = pread(fd, buf + rc, len - rc, off + rc)) > -1) {
if (!rval) /* prevent infinite loop */
err(EIO, "%s: pread of 0 bytes", fname);
continue;
}
if (errno != EINTR || rval < -1)
err(EIO, "%s", fname);
errno = 0;
}
read_file_exact(gbe_fd, mem_offset,
gbe_rw_size, gbe_file_offset(p, "pread"),
1, fname);
}
static void
@@ -961,52 +934,45 @@ rhex(void)
static uint8_t rnum[12];
if (!n) {
#ifdef NVMUTIL_ARC4RANDOM_BUF
n = sizeof(rnum);
#ifdef NVMUTIL_ARC4RANDOM_BUF
arc4random_buf(rnum, n);
#else
n = (size_t)read_dev_urandom(
urandom_fd, rnum, sizeof(rnum));
if (!n || n > sizeof(rnum))
err(ECANCELED, "Randomisation failure");
read_file_exact(urandom_fd, rnum, n, 0, 0, rname);
#endif
}
return (uint16_t)(rnum[--n] & 0xf);
}
#ifndef NVMUTIL_ARC4RANDOM_BUF
static ssize_t
read_dev_urandom(int fd, void *buf, size_t len)
static void
read_file_exact(int fd, uint8_t *mem,
size_t len, off_t off, uint8_t plesen, const char *path)
{
int retry;
ssize_t rval;
ssize_t rval = -1;
ssize_t rc = 0;
if (fd == -1)
err(ECANCELED, "Trying to open bad fd: %s", rname);
err(ECANCELED, "Trying to open bad fd: %s", path);
for (retry = 0; retry < MAX_RETRY_RW; retry++) {
rval = read(fd, buf, len);
for (rc = 0; rc != (ssize_t)len; rc += rval) {
if (plesen)
rval = pread(fd, mem + rc, len - rc, off + rc);
else
rval = read(fd, mem + rc, len - rc);
if (rval == -1) {
if (errno == EINTR)
continue;
err(errno, "%s", rname);
if (rval > -1) {
if (!rval) /* prevent infinite loop */
err(EIO, "%s: read of 0 bytes", path);
continue;
}
if (!rval || (size_t)rval > len)
continue;
if (errno != EINTR || rval < -1)
err(EIO, "%s", path);
errno = 0;
return rval;
}
err(EINTR, "%s: read: max retries exceeded: %s", rname);
return -1;
}
#endif
static void
write_mac_part(size_t partnum)