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-rw-r--r--util/nvmutil/Makefile2
-rw-r--r--util/nvmutil/nvmutil.c438
2 files changed, 285 insertions, 155 deletions
diff --git a/util/nvmutil/Makefile b/util/nvmutil/Makefile
index 22376c70..bef6f28c 100644
--- a/util/nvmutil/Makefile
+++ b/util/nvmutil/Makefile
@@ -3,7 +3,7 @@
# SPDX-FileCopyrightText: 2023 Riku Viitanen <riku.viitanen@protonmail.com>
CC?=cc
-CFLAGS?=-Os -Wall -Wextra -Werror -pedantic -std=c99
+CFLAGS?=-Os -Wall -Wextra -Werror -pedantic -std=c90
DESTDIR?=
PREFIX?=/usr/local
INSTALL?=install
diff --git a/util/nvmutil/nvmutil.c b/util/nvmutil/nvmutil.c
index 106dfd6a..c75769d7 100644
--- a/util/nvmutil/nvmutil.c
+++ b/util/nvmutil/nvmutil.c
@@ -41,8 +41,12 @@ typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
#endif
-#else
+#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#include <stdint.h>
+#else
+typedef unsigned char uint8_t;
+typedef unsigned short uint16_t;
+typedef unsigned int uint32_t;
#endif
#include <stdio.h>
#include <stdlib.h>
@@ -54,30 +58,16 @@ typedef char static_assert_uint8_is_1[(sizeof(uint8_t) == 1) ? 1 : -1];
typedef char static_assert_uint16_is_2[(sizeof(uint16_t) == 2) ? 1 : -1];
typedef char static_assert_uint32_is_4[(sizeof(uint32_t) == 4) ? 1 : -1];
typedef char static_assert_int_ge_32[(sizeof(int) >= 4) ? 1 : -1];
+typedef char static_assert_twos_complement[
+ ((-1 & 3) == 3) ? 1 : -1
+];
/*
* We set _FILE_OFFSET_BITS 64, but we only handle
* files that are 128KB in size at a maximum, so we
* realistically only need 32-bit at a minimum.
*/
-typedef char static_assert_off_t_is_64[(sizeof(off_t) >= 4) ? 1 : -1];
-
-/*
- * The BSD versions that could realistically build
- * nvmutil almost certainly have arc4random (first
- * introduced in 1990s to early 2000s).
- *
- * If you want it on another platform, e.g. Linux,
- * just patch this accordingly. Or patch it to remove
- * arc4random on old/weird Unix systems.
- */
-#if defined(__OpenBSD__) || defined(__FreeBSD__) || \
- defined(__NetBSD__) || defined(__APPLE__) || \
- defined(__DragonFly__)
-#ifndef NVMUTIL_ARC4RANDOM_BUF
-#define NVMUTIL_ARC4RANDOM_BUF 1
-#endif
-#endif
+typedef char static_assert_off_t_is_32[(sizeof(off_t) >= 4) ? 1 : -1];
/*
* Older versions of BSD to the early 2000s
@@ -99,6 +89,22 @@ typedef char static_assert_off_t_is_64[(sizeof(off_t) >= 4) ? 1 : -1];
#endif
#endif
+#ifndef EXIT_FAILURE
+#define EXIT_FAILURE 1
+#endif
+
+#ifndef EXIT_SUCCESS
+#define EXIT_SUCCESS 0
+#endif
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+#ifndef O_NONBLOCK
+#define O_NONBLOCK 0
+#endif
+
/*
* Sanitize command tables.
*/
@@ -122,9 +128,7 @@ static int xstrxcmp(const char *a, const char *b, size_t maxlen);
* on Linux / old Unix, whereas
* arc4random is used on BSD/MacOS.
*/
-#ifndef NVMUTIL_ARC4RANDOM_BUF
static void open_dev_urandom(void);
-#endif
static void open_gbe_file(void);
static void xopen(int *fd, const char *path, int flags, struct stat *st);
@@ -205,8 +209,13 @@ static uint8_t *gbe_mem_offset(size_t part, const char *f_op);
static off_t gbe_file_offset(size_t part, const char *f_op);
static off_t gbe_x_offset(size_t part, const char *f_op,
const char *d_type, off_t nsize, off_t ncmp);
-static void rw_file_exact(int fd, uint8_t *mem, size_t len,
- off_t off, int rw_type, const char *path, const char *rw_type_str);
+static ssize_t rw_file_exact(int fd, uint8_t *mem, size_t len,
+ off_t off, int rw_type);
+static ssize_t do_rw(int fd,
+ uint8_t *mem, size_t len, off_t off, int rw_type);
+static ssize_t prw(int fd, void *mem, size_t nrw,
+ off_t off, int rw_type);
+static off_t lseek_eintr(int fd, off_t off, int whence);
/*
* Error handling and cleanup
@@ -214,7 +223,7 @@ static void rw_file_exact(int fd, uint8_t *mem, size_t len,
static void err(int nvm_errval, const char *msg, ...);
static void close_files(void);
static const char *getnvmprogname(void);
-static void set_err(int errval);
+static void set_err_if_unset(int errval);
static void usage(uint8_t usage_exit);
/*
@@ -251,11 +260,9 @@ static void usage(uint8_t usage_exit);
*/
#define items(x) (sizeof((x)) / sizeof((x)[0]))
-#ifndef NVMUTIL_ARC4RANDOM_BUF
static const char newrandom[] = "/dev/urandom";
static const char oldrandom[] = "/dev/random"; /* fallback on OLD unix */
static const char *rname = NULL;
-#endif
/*
* GbE files can be 8KB, 16KB or 128KB,
@@ -267,14 +274,12 @@ static const char *rname = NULL;
* The code will handle this properly.
*/
static uint8_t buf[GBE_FILE_SIZE];
-static uint8_t pad[GBE_PART_SIZE];
+static uint8_t pad[GBE_PART_SIZE]; /* the file that wouldn't die */
static uint16_t mac_buf[3];
static off_t gbe_file_size;
-#ifndef NVMUTIL_ARC4RANDOM_BUF
static int urandom_fd = -1;
-#endif
static int gbe_fd = -1;
static size_t part;
static uint8_t part_modified[2];
@@ -286,7 +291,7 @@ static const char *fname;
static const char *argv0;
#ifndef SSIZE_MAX
-#define SSIZE_MAX ((ssize_t)((size_t)-1 >> 1))
+#define SSIZE_MAX ((ssize_t)(~((size_t)1 << (sizeof(ssize_t)*CHAR_BIT-1))))
#endif
/*
@@ -439,12 +444,12 @@ main(int argc, char *argv[])
#ifdef NVMUTIL_PLEDGE
#ifdef NVMUTIL_UNVEIL
if (pledge("stdio rpath wpath unveil", NULL) == -1)
- err(ECANCELED, "pledge");
+ err(errno, "pledge");
if (unveil("/dev/null", "r") == -1)
- err(ECANCELED, "unveil '/dev/null'");
+ err(errno, "unveil '/dev/null'");
#else
if (pledge("stdio rpath wpath", NULL) == -1)
- err(ECANCELED, "pledge");
+ err(errno, "pledge");
#endif
#endif
@@ -457,41 +462,34 @@ main(int argc, char *argv[])
#ifdef NVMUTIL_UNVEIL
if (command[cmd_index].flags == O_RDONLY) {
if (unveil(fname, "r") == -1)
- err(ECANCELED, "%s: unveil ro", fname);
+ err(errno, "%s: unveil ro", fname);
if (unveil(NULL, NULL) == -1)
- err(ECANCELED, "unveil block (ro)");
+ err(errno, "unveil block (ro)");
if (pledge("stdio rpath", NULL) == -1)
- err(ECANCELED, "pledge ro (kill unveil)");
+ err(errno, "pledge ro (kill unveil)");
} else {
if (unveil(fname, "rw") == -1)
- err(ECANCELED, "%s: unveil rw", fname);
+ err(errno, "%s: unveil rw", fname);
if (unveil(NULL, NULL) == -1)
- err(ECANCELED, "unveil block (rw)");
+ err(errno, "unveil block (rw)");
if (pledge("stdio rpath wpath", NULL) == -1)
- err(ECANCELED, "pledge rw (kill unveil)");
+ err(errno, "pledge rw (kill unveil)");
}
#else
if (command[cmd_index].flags == O_RDONLY) {
if (pledge("stdio rpath", NULL) == -1)
- err(ECANCELED, "pledge ro");
+ err(errno, "pledge ro");
}
#endif
#endif
-#ifndef NVMUTIL_ARC4RANDOM_BUF
-#if defined(__OpenBSD__) || defined(__FreeBSD__) || \
- defined(__NetBSD__) || defined(__APPLE__) || \
- defined(__DragonFly__)
- err(ECANCELED, "Maintainer error: arc4random disabled on BSD/MacOS");
-#endif
open_dev_urandom();
-#endif
open_gbe_file();
#ifdef NVMUTIL_PLEDGE
if (pledge("stdio", NULL) == -1)
- err(ECANCELED, "pledge stdio (main)");
+ err(errno, "pledge stdio (main)");
#endif
/*
@@ -502,17 +500,19 @@ main(int argc, char *argv[])
read_gbe_file();
read_checksums();
+ errno = 0;
run_cmd(cmd_index);
- if (errno)
+ if (errno && (!(part_valid[0] || part_valid[1])))
err(errno, "%s: Unhandled error (WRITE SKIPPED)", fname);
- else if (command[cmd_index].flags == O_RDWR)
+
+ if (command[cmd_index].flags == O_RDWR)
write_gbe_file();
close_files();
if (errno)
- err(ECANCELED, "Unhandled error on exit");
+ err(errno, "Unhandled error on exit");
return EXIT_SUCCESS;
}
@@ -525,7 +525,7 @@ sanitize_command_list(void)
{
size_t c;
- for (c = 0; valid_command(c); c++)
+ for (c = 0; c < N_COMMANDS; c++)
sanitize_command_index(c);
}
@@ -538,23 +538,25 @@ sanitize_command_index(size_t c)
check_command_num(c);
if (ARGC_3 != 3)
- err(ECANCELED, "ARGC_3 is not equal to 3");
+ err(EINVAL, "ARGC_3 is not equal to 3");
if (ARGC_4 != 4)
- err(ECANCELED, "ARGC_4 is not equal to 4");
+ err(EINVAL, "ARGC_4 is not equal to 4");
if (command[c].argc < 3)
- err(ECANCELED, "cmd index %zu: argc below 3, %d",
- c, command[c].argc);
+ err(EINVAL, "cmd index %lu: argc below 3, %d",
+ (unsigned long)c, command[c].argc);
if (command[c].str == NULL)
- err(ECANCELED, "cmd index %zu: NULL str", c);
+ err(EINVAL, "cmd index %lu: NULL str",
+ (unsigned long)c);
if (*command[c].str == '\0')
- err(ECANCELED, "cmd index %zu: empty str", c);
+ err(EINVAL, "cmd index %lu: empty str",
+ (unsigned long)c);
if (xstrxlen(command[c].str, MAX_CMD_LEN + 1) >
MAX_CMD_LEN) {
- err(ECANCELED, "cmd index %zu: str too long: %s",
- c, command[c].str);
+ err(EINVAL, "cmd index %lu: str too long: %s",
+ (unsigned long)c, command[c].str);
}
mod_type = command[c].set_modified;
@@ -587,12 +589,13 @@ sanitize_command_index(size_t c)
case NVM_SIZE:
break;
default:
- err(EINVAL, "Unsupported rw_size: %zu", gbe_rw_size);
+ err(EINVAL, "Unsupported rw_size: %lu",
+ (unsigned long)gbe_rw_size);
}
if (gbe_rw_size > GBE_PART_SIZE)
- err(EINVAL, "rw_size larger than GbE part: %zu",
- gbe_rw_size);
+ err(EINVAL, "rw_size larger than GbE part: %lu",
+ (unsigned long)gbe_rw_size);
if (command[c].flags != O_RDONLY &&
command[c].flags != O_RDWR)
@@ -607,10 +610,10 @@ check_enum_bin(size_t a, const char *a_name,
size_t b, const char *b_name)
{
if (a)
- err(ECANCELED, "%s is non-zero", a_name);
+ err(EINVAL, "%s is non-zero", a_name);
if (b != 1)
- err(ECANCELED, "%s is a value other than 1", b_name);
+ err(EINVAL, "%s is a value other than 1", b_name);
}
static void
@@ -644,10 +647,10 @@ set_cmd_args(int argc, char *argv[])
/* Maintainer bugs */
if (arg_part && argc < 4)
- err(ECANCELED,
+ err(EINVAL,
"arg_part set for command that needs argc4");
if (arg_part && cmd_index == CMD_SETMAC)
- err(ECANCELED,
+ err(EINVAL,
"arg_part set on CMD_SETMAC");
if (cmd_index == CMD_SETMAC)
@@ -703,22 +706,23 @@ xstrxcmp(const char *a, const char *b, size_t maxlen)
/*
* Should never reach here. This keeps compilers happy.
*/
- errno = EINVAL;
+ set_err_if_unset(EINVAL);
return -1;
}
-#ifndef NVMUTIL_ARC4RANDOM_BUF
static void
open_dev_urandom(void)
{
- struct stat st_urandom_fd;
-
rname = newrandom;
- if ((urandom_fd = open(rname, O_RDONLY)) != -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",
@@ -727,16 +731,17 @@ open_dev_urandom(void)
errno = 0;
rname = oldrandom;
- xopen(&urandom_fd, rname, O_RDONLY, &st_urandom_fd);
+ urandom_fd = open(rname, O_RDONLY | O_BINARY | O_NONBLOCK);
+ if (urandom_fd == -1)
+ err(errno, "%s: could not open", rname);
}
-#endif
static void
open_gbe_file(void)
{
struct stat gbe_st;
- xopen(&gbe_fd, fname, command[cmd_index].flags, &gbe_st);
+ xopen(&gbe_fd, fname, command[cmd_index].flags | O_BINARY, &gbe_st);
gbe_file_size = gbe_st.st_size;
@@ -746,7 +751,7 @@ open_gbe_file(void)
case SIZE_128KB:
break;
default:
- err(ECANCELED, "File size must be 8KB, 16KB or 128KB");
+ err(EINVAL, "File size must be 8KB, 16KB or 128KB");
}
}
@@ -754,10 +759,13 @@ static void
xopen(int *fd_ptr, const char *path, int flags, struct stat *st)
{
if ((*fd_ptr = open(path, flags)) == -1)
- err(ECANCELED, "%s", path);
+ err(errno, "%s", path);
if (fstat(*fd_ptr, st) == -1)
- err(ECANCELED, "%s", path);
+ err(errno, "%s", path);
+
+ if (!S_ISREG(st->st_mode))
+ err(errno, "%s: not a regular file", path);
}
static void
@@ -789,6 +797,9 @@ read_checksums(void)
uint8_t num_invalid;
uint8_t max_invalid;
+ part_valid[0] = 0;
+ part_valid[1] = 0;
+
if (!command[cmd_index].chksum_read)
return;
@@ -813,9 +824,8 @@ read_checksums(void)
if (arg_part && (p == skip_part))
continue;
- if (good_checksum(p))
- part_valid[p] = 1;
- else
+ part_valid[p] = good_checksum(p);
+ if (!part_valid[p])
++num_invalid;
}
@@ -824,9 +834,9 @@ read_checksums(void)
if (num_invalid >= max_invalid) {
if (max_invalid == 1)
- err(ECANCELED, "%s: part %zu has a bad checksum",
- fname, part);
- err(ECANCELED, "%s: No valid checksum found in file",
+ err(EINVAL, "%s: part %lu has a bad checksum",
+ fname, (unsigned long)part);
+ err(EINVAL, "%s: No valid checksum found in file",
fname);
}
}
@@ -840,7 +850,7 @@ good_checksum(size_t partnum)
if (current_checksum == expected_checksum)
return 1;
- set_err(ECANCELED);
+ set_err_if_unset(EINVAL);
return 0;
}
@@ -848,7 +858,7 @@ static void
run_cmd(size_t c)
{
check_command_num(c);
- if (command[c].run)
+ if (command[c].run != NULL)
command[c].run();
}
@@ -856,7 +866,8 @@ static void
check_command_num(size_t c)
{
if (!valid_command(c))
- err(ECANCELED, "Invalid run_cmd arg: %zu", c);
+ err(errno, "Invalid run_cmd arg: %lu",
+ (unsigned long)c);
}
static uint8_t
@@ -866,8 +877,8 @@ valid_command(size_t c)
return 0;
if (c != command[c].chk)
- err(ECANCELED, "Invalid cmd chk value (%zu) vs arg: %zu",
- command[c].chk, c);
+ err(EINVAL, "Invalid cmd chk value (%lu) vs arg: %lu",
+ (unsigned long)command[c].chk, (unsigned long)c);
return 1;
}
@@ -877,12 +888,6 @@ cmd_helper_setmac(void)
{
size_t partnum;
-#ifdef NVMUTIL_ARC4RANDOM_BUF
- printf("Randomisation method: arc4random_buf\n");
-#else
- printf("Randomisation method: %s\n", rname);
-#endif
-
printf("MAC address to be written: %s\n", mac_str);
parse_mac_string();
@@ -1011,11 +1016,9 @@ rhex(void)
if (!n) {
n = sizeof(rnum);
-#ifdef NVMUTIL_ARC4RANDOM_BUF
- arc4random_buf(rnum, n);
-#else
- rw_file_exact(urandom_fd, rnum, n, 0, LESEN, rname, "read");
-#endif
+ if (rw_file_exact(urandom_fd, rnum, n, 0, LESEN) == -1)
+ err(errno, "Randomisation failed");
+ errno = 0;
}
return (uint16_t)(rnum[--n] & 0xf);
@@ -1033,7 +1036,8 @@ write_mac_part(size_t partnum)
for (w = 0; w < 3; w++)
set_nvm_word(w, partnum, mac_buf[w]);
- printf("Wrote MAC address to part %zu: ", partnum);
+ printf("Wrote MAC address to part %lu: ",
+ (unsigned long)partnum);
print_mac_from_nvm(partnum);
}
@@ -1051,11 +1055,13 @@ cmd_helper_dump(void)
for (partnum = 0; partnum < 2; partnum++) {
if (!part_valid[partnum])
fprintf(stderr,
- "BAD checksum %04x in part %zu (expected %04x)\n",
+ "BAD checksum %04x in part %lu (expected %04x)\n",
nvm_word(NVM_CHECKSUM_WORD, partnum),
- partnum, calculated_checksum(partnum));
+ (unsigned long)partnum,
+ calculated_checksum(partnum));
- printf("MAC (part %zu): ", partnum);
+ printf("MAC (part %lu): ",
+ (unsigned long)partnum);
print_mac_from_nvm(partnum);
hexdump(partnum);
}
@@ -1084,7 +1090,7 @@ hexdump(size_t partnum)
uint16_t val16;
for (row = 0; row < 8; row++) {
- printf("%08zx ", (size_t)row << 4);
+ printf("%08lx ", (unsigned long)((size_t)row << 4));
for (c = 0; c < 8; c++) {
val16 = nvm_word((row << 3) + c, partnum);
if (c == 4)
@@ -1107,7 +1113,7 @@ cmd_helper_cat(void)
else if (cmd_index == CMD_CAT128)
n = 15;
else if (cmd_index != CMD_CAT)
- err(ECANCELED, "cmd_helper_cat called erroneously");
+ err(EINVAL, "cmd_helper_cat called erroneously");
fflush(NULL);
@@ -1122,8 +1128,38 @@ cmd_helper_cat(void)
static void
gbe_cat_buf(uint8_t *b)
{
- rw_file_exact(STDOUT_FILENO, b, GBE_PART_SIZE, 0,
- SCHREIB, "stdout", "write");
+ ssize_t rval;
+
+ while (1) {
+ rval = rw_file_exact(STDOUT_FILENO, b,
+ GBE_PART_SIZE, 0, SCHREIB);
+
+ if (rval >= 0) {
+ /*
+ * A partial write is especially
+ * fatal, as it should already be
+ * prevented in rw_file_exact().
+ */
+ if ((size_t)rval != GBE_PART_SIZE)
+ err(EIO, "stdout: cat: Partial write");
+ break;
+ }
+
+ if (errno != EAGAIN)
+ err(errno, "stdout: cat");
+
+ /*
+ * We assume that no data
+ * was written to stdout.
+ */
+ errno = 0;
+ }
+
+ /*
+ * No errors here.
+ * Avoid the warning in main()
+ */
+ errno = 0;
}
static void
@@ -1252,14 +1288,16 @@ check_nvm_bound(size_t c, size_t p)
check_bin(p, "part number");
if (c >= NVM_WORDS)
- err(EINVAL, "check_nvm_bound: out of bounds %zu", c);
+ err(ECANCELED, "check_nvm_bound: out of bounds %lu",
+ (unsigned long)c);
}
static void
check_bin(size_t a, const char *a_name)
{
if (a > 1)
- err(ECANCELED, "%s must be 0 or 1, but is %zu", a_name, a);
+ err(EINVAL, "%s must be 0 or 1, but is %lu",
+ a_name, (unsigned long)a);
}
static void
@@ -1280,9 +1318,13 @@ rw_gbe_file_part(size_t p, int rw_type,
*/
mem_offset = gbe_mem_offset(p ^ invert, rw_type_str);
- rw_file_exact(gbe_fd, mem_offset,
+ if (rw_file_exact(gbe_fd, mem_offset,
gbe_rw_size, gbe_file_offset(p, rw_type_str),
- rw_type, fname, rw_type_str);
+ rw_type) == -1)
+ err(errno, "%s: %s: part %lu",
+ fname, rw_type_str, (unsigned long)p);
+
+ errno = 0;
}
/*
@@ -1300,8 +1342,7 @@ gbe_mem_offset(size_t p, const char *f_op)
}
/*
- * Reads to GbE from write_gbe_file_part and read_gbe_file_part
- * are filtered through here. These operations must
+ * I/O operations filtered here. These operations must
* only write from the 0th position or the half position
* within the GbE file, and write 4KB of data.
*
@@ -1324,9 +1365,9 @@ gbe_x_offset(size_t p, const char *f_op, const char *d_type,
check_bin(p, "part number");
- off = (off_t)p * nsize;
+ off = ((off_t)p) * (off_t)nsize;
- if (off + GBE_PART_SIZE > ncmp)
+ if (off > ncmp - GBE_PART_SIZE)
err(ECANCELED, "%s: GbE %s %s out of bounds",
fname, d_type, f_op);
@@ -1337,50 +1378,134 @@ gbe_x_offset(size_t p, const char *f_op, const char *d_type,
return off;
}
-static void
+/*
+ * Read or write the exact contents of a file,
+ * along with a buffer, (if applicable) offset,
+ * and number of bytes to be read. It unified
+ * the functionality of read(), pread(), write()
+ * and pwrite(), with retry-on-EINTR and also
+ * prevents infinite loop on zero-reads.
+ *
+ * The pread() and pwrite() functionality are
+ * provided by yet another portable function,
+ * prw() - see notes below.
+ *
+ * This must only be used on files. It cannot
+ * be used on sockets or pipes, because 0-byte
+ * reads are treated like fatal errors. This
+ * means that EOF is also considered fatal.
+ */
+static ssize_t
rw_file_exact(int fd, uint8_t *mem, size_t len,
- off_t off, int rw_type, const char *path,
- const char *rw_type_str)
+ off_t off, int rw_type)
{
- ssize_t rval = -1;
+ ssize_t rval = 0;
size_t rc = 0;
- if (fd < 0)
- err(EIO, "%s: %s: Bad fd %d", path, rw_type_str, fd);
- if (!len)
- err(EIO, "%s: %s: Zero length", path, rw_type_str);
- if (len > (size_t)SSIZE_MAX)
- err(EIO,
- "%s: %s: Requested length (%zu) exceeds SSIZE_MAX (%zd)",
- path, rw_type_str, len, SSIZE_MAX);
-
- for (rc = 0; rc != len; rc += rval) {
- if (rw_type == PSCHREIB)
- rval = pwrite(fd, mem + rc, len - rc, off + rc);
- else if (rw_type == SCHREIB)
- rval = write(fd, mem + rc, len - rc);
- else if (rw_type == PLESEN)
- rval = pread(fd, mem + rc, len - rc, off + rc);
- else if (rw_type == LESEN)
- rval = read(fd, mem + rc, len - rc);
-
- if (rval > -1) {
- if (!rval) /* prevent infinite loop */
- err(EIO, "%s: %s: 0-byte return",
- path, rw_type_str);
+ if (fd < 0 || !len || len > (size_t)SSIZE_MAX) {
+ set_err_if_unset(EIO);
+ return -1;
+ }
+
+ while (rc < len) {
+ rval = do_rw(fd, mem + rc, len - rc, off + rc, rw_type);
+
+ if (rval < 0 && errno == EINTR) {
continue;
+ } else if (rval < 0) {
+ set_err_if_unset(EIO);
+ return -1;
+ }
+ if ((size_t)rval > (len - rc) /* Prevent overflow */
+ || rval == 0) { /* Prevent infinite 0-byte loop */
+ set_err_if_unset(EIO);
+ return -1;
}
- if (errno != EINTR || rval < -1)
- err(EIO, "%s: %s", path, rw_type_str);
+ rc += (size_t)rval;
+ }
- errno = 0;
+ return rc;
+}
+
+static ssize_t
+do_rw(int fd, uint8_t *mem,
+ size_t len, off_t off, int rw_type)
+{
+ if (rw_type == LESEN)
+ return read(fd, mem, len);
+
+ if (rw_type == SCHREIB)
+ return write(fd, mem, len);
+
+ if (rw_type == PLESEN || rw_type == PSCHREIB)
+ return prw(fd, mem, len, off, rw_type);
+
+ set_err_if_unset(EINVAL);
+ return -1;
+}
+
+/*
+ * This implements a portable analog of pwrite()
+ * and pread() - note that this version is not
+ * thread-safe (race conditions are possible on
+ * shared file descriptors).
+ *
+ * This limitation is acceptable, since nvmutil is
+ * single-threaded. Portability is the main goal.
+ */
+static ssize_t
+prw(int fd, void *mem, size_t nrw,
+ off_t off, int rw_type)
+{
+ off_t off_orig;
+ ssize_t r;
+ int saved_errno;
+
+ if ((off_orig = lseek_eintr(fd, (off_t)0, SEEK_CUR)) == (off_t)-1)
+ return -1;
+ if (lseek_eintr(fd, off, SEEK_SET) == (off_t)-1)
+ return -1;
+
+ do {
+ if (rw_type == PLESEN)
+ r = read(fd, mem, nrw);
+ else if (rw_type == PSCHREIB)
+ r = write(fd, mem, nrw);
+ else {
+ set_err_if_unset(EINVAL);
+ return -1;
+ }
+ } while (r < 0 && errno == EINTR);
+
+ saved_errno = errno;
+ if (lseek_eintr(fd, off_orig, SEEK_SET) == (off_t)-1) {
+ if (r < 0)
+ errno = saved_errno;
+ return -1;
}
+ errno = saved_errno;
+
+ return r;
+}
+
+static off_t
+lseek_eintr(int fd, off_t off, int whence)
+{
+ off_t old;
+
+ do {
+ old = lseek(fd, off, whence);
+ } while (old == (off_t)-1 && errno == EINTR);
+
+ return old;
}
static void
err(int nvm_errval, const char *msg, ...)
{
+ va_list args;
+
/*
* We need to ensure that files are closed
* on exit, including error exits. This
@@ -1390,7 +1515,7 @@ err(int nvm_errval, const char *msg, ...)
* one that does this.
*
* Since the errval is for setting errno, -1
- * would be incorrect. Therefore, set_err()
+ * would be incorrect. Therefore, set_err_if_unset()
* avoids overriding errno if the given value
* is negative.
*
@@ -1399,15 +1524,13 @@ err(int nvm_errval, const char *msg, ...)
if (nvm_errval != -1)
close_files();
- va_list args;
-
fprintf(stderr, "%s: ", getnvmprogname());
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
- set_err(nvm_errval);
+ set_err_if_unset(nvm_errval);
fprintf(stderr, ": %s", strerror(errno));
fprintf(stderr, "\n");
@@ -1423,13 +1546,11 @@ close_files(void)
gbe_fd = -1;
}
-#ifndef NVMUTIL_ARC4RANDOM_BUF
if (urandom_fd > -1) {
if (close(urandom_fd) == -1)
err(-1, "%s: close failed", rname);
urandom_fd = -1;
}
-#endif
}
static const char *
@@ -1448,8 +1569,17 @@ getnvmprogname(void)
return argv0;
}
+/*
+ * Set errno only if it hasn't already been set.
+ * This prevents overriding real libc errors.
+ *
+ * We use errno for regular program state, while
+ * being careful not to clobber what was set by
+ * real libc function, or a minority of our stub
+ * functions such as prw()
+ */
static void
-set_err(int x)
+set_err_if_unset(int x)
{
if (errno)
return;
@@ -1466,7 +1596,7 @@ usage(uint8_t usage_exit)
#ifdef NVMUTIL_PLEDGE
if (pledge("stdio", NULL) == -1)
- err(ECANCELED, "pledge");
+ err(errno, "pledge");
#endif
fprintf(stderr,
"Modify Intel GbE NVM images e.g. set MAC\n"
generated by cgit v1.2.1 (git 2.18.0) at 2026-03-10 17:11:30 +0000