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Diffstat (limited to 'util/nvmutil/nvmutil.c')
-rw-r--r--util/nvmutil/nvmutil.c283
1 files changed, 259 insertions, 24 deletions
diff --git a/util/nvmutil/nvmutil.c b/util/nvmutil/nvmutil.c
index 05459bb7..f9e72ea4 100644
--- a/util/nvmutil/nvmutil.c
+++ b/util/nvmutil/nvmutil.c
@@ -2,24 +2,38 @@
/* Copyright (c) 2022-2025 Leah Rowe <leah@libreboot.org> */
/* Copyright (c) 2023 Riku Viitanen <riku.viitanen@protonmail.com> */
+#include <sys/types.h>
#include <sys/stat.h>
-#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
-#include <stdint.h>
+#include <stdarg.h>
+#include <stddef.h>
#include <stdio.h>
-#include <stdlib.h>
#include <string.h>
+#include <stdlib.h>
#include <unistd.h>
+#include <limits.h>
+#include <stdint.h>
void cmd_setchecksum(void), cmd_brick(void), swap(int partnum), writeGbe(void),
- cmd_dump(void), cmd_setmac(void), readGbe(void), checkdir(const char *path),
+ cmd_dump(void), cmd_setmac(void), readGbe(void),
macf(int partnum), hexdump(int partnum), openFiles(const char *path),
cmd_copy(void), parseMacString(const char *strMac, uint16_t *mac),
- cmd_swap(void);
-int goodChecksum(int partnum);
+ cmd_swap(void), xclose(int *fd);
+int goodChecksum(int partnum), open_on_eintr(const char *pathname, int flags),
+ fs_retry(int saved_errno, int rval),
+ rw_retry(int saved_errno, ssize_t rval), if_err(int condition, int errval),
+ if_err_sys(int condition);
+ssize_t rw_exact(int fd, unsigned char *mem, size_t nrw,
+ off_t off, int rw_type);
+ssize_t rw(int fd, void *mem, size_t nrw,
+ off_t off, int rw_type);
+int io_args(int fd, void *mem, size_t nrw,
+ off_t off, int rw_type);
+int with_fallback_errno(int fallback);
+ssize_t rw_over_nrw(ssize_t r, size_t nrw);
uint8_t hextonum(char chs), rhex(void);
#define COMMAND argv[2]
@@ -34,6 +48,11 @@ uint8_t hextonum(char chs), rhex(void);
#define SIZE_16KB 0x4000
#define SIZE_128KB 0x20000
+#define IO_READ 0
+#define IO_WRITE 1
+#define IO_PREAD 2
+#define IO_PWRITE 3
+
uint16_t mac[3] = {0, 0, 0};
ssize_t nf;
size_t partsize, gbe[2];
@@ -60,13 +79,21 @@ void (*cmd)(void) = NULL;
#define ERR() errno = errno ? errno : ECANCELED
#define err_if(x) if (x) err(ERR(), "%s", filename)
-#define xopen(f,l,p) if ((f = open(l, p)) == -1) err(ERR(), "%s", l); \
+#define xopen(f,l,p) if ((f = open_on_eintr(l, p)) == -1) err(ERR(), "%s", l); \
if (fstat(f, &st) == -1) err(ERR(), "%s", l)
#define word(pos16, partnum) ((uint16_t *) gbe[partnum])[pos16]
#define setWord(pos16, p, val16) if (word(pos16, p) != val16) \
nvmPartChanged[p] = 1 | (word(pos16, p) = val16)
+#define SUCCESS(x) ((x) >= 0)
+
+#define reset_caller_errno(return_value) \
+ do { \
+ if (SUCCESS(return_value) && (!errno)) \
+ errno = saved_errno; \
+ } while (0)
+
int
main(int argc, char *argv[])
{
@@ -104,9 +131,6 @@ main(int argc, char *argv[])
}
}
- checkdir("/dev/urandom");
- checkdir(filename);
-
#ifdef __OpenBSD__
err_if(unveil("/dev/urandom", "r") == -1);
@@ -163,16 +187,6 @@ main(int argc, char *argv[])
}
void
-checkdir(const char *path)
-{
- if (opendir(path) != NULL)
- err(errno = EISDIR, "%s", path);
- if (errno == ENOTDIR)
- errno = 0;
- err_if(errno);
-}
-
-void
openFiles(const char *path)
{
struct stat st;
@@ -217,7 +231,8 @@ readGbe(void)
if (!do_read[p])
continue;
- ssize_t nr = pread(fd, (uint8_t *) gbe[p], nf, p * partsize);
+ ssize_t nr = rw_exact(fd, (uint8_t *) gbe[p],
+ nf, p * partsize, IO_PREAD);
err_if(nr == -1);
if (nr != nf)
err(errno == ECANCELED,
@@ -316,7 +331,8 @@ rhex(void)
{
static uint8_t n = 0, rnum[16];
if (!n)
- err_if(pread(rfd, (uint8_t *) &rnum, (n = 15) + 1, 0) == -1);
+ err_if(rw_exact(rfd, (uint8_t *) &rnum,
+ (n = 15) + 1, 0, IO_READ) == -1);
return rnum[n--] & 0xf;
}
@@ -429,7 +445,8 @@ writeGbe(void)
continue;
swap(p); /* swap bytes on big-endian host CPUs */
- ssize_t nw = pwrite(fd, (uint8_t *) gbe[p], nf, p * partsize);
+ ssize_t nw = rw_exact(fd, (uint8_t *) gbe[p], nf,
+ p * partsize, IO_PWRITE);
err_if(nw == -1);
if (nw != nf)
err(errno == ECANCELED,
@@ -453,7 +470,32 @@ writeGbe(void)
if (tnw)
errno = 0;
- err_if(close(fd) == -1);
+ xclose(&fd);
+}
+
+void
+xclose(int *fd)
+{
+ int saved_errno = errno;
+ int rval = 0;
+
+ if (fd == NULL)
+ err(EXIT_FAILURE, "xclose: null pointer");
+ if (*fd < 0)
+ return;
+
+ errno = 0;
+ if ((rval = close(*fd)) < 0) {
+ if (errno != EINTR)
+ err(EXIT_FAILURE, "xclose: could not close");
+
+ /* regard EINTR as a successful close */
+ rval = 0;
+ }
+
+ *fd = -1;
+
+ reset_caller_errno(rval);
}
void
@@ -470,3 +512,196 @@ swap(int partnum)
n[w] ^= n[x];
}
}
+
+int
+open_on_eintr(const char *pathname,
+ int flags)
+{
+ int saved_errno = errno;
+ int rval = 0;
+ errno = 0;
+
+ while (fs_retry(saved_errno,
+ rval = open(pathname, flags)));
+
+ reset_caller_errno(rval);
+ return rval;
+}
+
+
+ssize_t
+rw_exact(int fd, unsigned char *mem, size_t nrw,
+ off_t off, int rw_type)
+{
+ int saved_errno = errno;
+ ssize_t rval = 0;
+ ssize_t rc = 0;
+ size_t nrw_cur;
+ off_t off_cur;
+ void *mem_cur;
+ errno = 0;
+
+ if (io_args(fd, mem, nrw, off, rw_type) == -1)
+ goto err_rw_exact;
+
+ while (1) {
+
+ /* Prevent theoretical overflow */
+ if (if_err(rval >= 0 && (size_t)rval > (nrw - (size_t)rc),
+ EOVERFLOW))
+ goto err_rw_exact;
+
+ rc += rval;
+ if ((size_t)rc >= nrw)
+ break;
+
+ mem_cur = (void *)(mem + (size_t)rc);
+ nrw_cur = (size_t)(nrw - (size_t)rc);
+
+ if (if_err(off < 0, EOVERFLOW))
+ goto err_rw_exact;
+
+ off_cur = off + (off_t)rc;
+
+ if ((rval = rw(fd, mem_cur, nrw_cur, off_cur, rw_type)) <= 0)
+ goto err_rw_exact;
+ }
+
+ if (if_err((size_t)rc != nrw, EIO) ||
+ (rval = rw_over_nrw(rc, nrw)) < 0)
+ goto err_rw_exact;
+
+ reset_caller_errno(rval);
+ return rval;
+
+err_rw_exact:
+ return with_fallback_errno(EIO);
+}
+
+ssize_t
+rw(int fd, void *mem, size_t nrw,
+ off_t off, int rw_type)
+{
+ ssize_t rval = 0;
+ ssize_t r = -1;
+ int saved_errno = errno;
+ errno = 0;
+
+ if (io_args(fd, mem, nrw, off, rw_type) == -1 ||
+ if_err(mem == NULL, EFAULT) ||
+ if_err(fd < 0, EBADF) ||
+ if_err(off < 0, EFAULT) ||
+ if_err(nrw == 0, EINVAL))
+ return with_fallback_errno(EIO);
+
+ do {
+ switch (rw_type) {
+ case IO_READ:
+ r = read(fd, mem, nrw);
+ break;
+ case IO_WRITE:
+ r = write(fd, mem, nrw);
+ break;
+ case IO_PREAD:
+ r = pread(fd, mem, nrw, off);
+ break;
+ case IO_PWRITE:
+ r = pwrite(fd, mem, nrw, off);
+ break;
+ default:
+ errno = EINVAL;
+ break;
+ }
+
+ } while (rw_retry(saved_errno, r));
+
+ if ((rval = rw_over_nrw(r, nrw)) < 0)
+ return with_fallback_errno(EIO);
+
+ reset_caller_errno(rval);
+ return rval;
+}
+
+int
+io_args(int fd, void *mem, size_t nrw,
+ off_t off, int rw_type)
+{
+ int saved_errno = errno;
+ errno = 0;
+
+ if (if_err(mem == NULL, EFAULT) ||
+ if_err(fd < 0, EBADF) ||
+ if_err(off < 0, ERANGE) ||
+ if_err(!nrw, EPERM) || /* TODO: toggle zero-byte check */
+ if_err(nrw > (size_t)SSIZE_MAX, ERANGE) ||
+ if_err(((size_t)off + nrw) < (size_t)off, ERANGE) ||
+ if_err(rw_type > IO_PWRITE, EINVAL))
+ goto err_io_args;
+
+ reset_caller_errno(0);
+ return 0;
+
+err_io_args:
+ return with_fallback_errno(EINVAL);
+}
+
+ssize_t
+rw_over_nrw(ssize_t r, size_t nrw)
+{
+ if (if_err(!nrw, EIO) ||
+ (r == -1) ||
+ if_err((size_t)r > SSIZE_MAX, ERANGE) ||
+ if_err((size_t)r > nrw, ERANGE))
+ return with_fallback_errno(EIO);
+
+ return r;
+}
+
+int
+with_fallback_errno(int fallback)
+{
+ if (!errno)
+ errno = fallback;
+ return -1;
+}
+
+/* two functions that reduce sloccount by
+ * two hundred lines */
+int
+if_err(int condition, int errval)
+{
+ if (!condition)
+ return 0;
+ if (errval)
+ errno = errval;
+ return 1;
+}
+int
+if_err_sys(int condition)
+{
+ if (!condition)
+ return 0;
+ return 1;
+}
+
+#define fs_err_retry() \
+ do { \
+ if ((rval == -1) && \
+ (errno == EINTR)) \
+ return 1; \
+ if (rval >= 0 && !errno) \
+ errno = saved_errno; \
+ return 0; \
+ } while(0)
+
+int
+fs_retry(int saved_errno, int rval)
+{
+ fs_err_retry();
+}
+
+int
+rw_retry(int saved_errno, ssize_t rval)
+{
+ fs_err_retry();
+}
generated by cgit v1.2.1 (git 2.18.0) at 2026-04-21 22:50:35 +0000