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util/nvmutil: more robust pointer handling 

i didn't like the previous commits, they felt really hacky

running malloc and then changing the pointer directly just rubs
me the wrong way

fix that
fsdg20230625
Leah Rowe 2022-12-24 00:52:05 +00:00 committed by lbmkplaceholder
parent 448ee5105d
commit d726b16f5f
1 changed files with 16 additions and 18 deletions
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34
util/nvmutil/nvmutil.c
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@ -57,7 +57,9 @@ void writeGbeFile(int *fd, const char *filename);
#define SIZE_4KB 0x1000
#define SIZE_8KB 0x2000
uint8_t *gbe = NULL, *gbe2 = NULL;
uint8_t *buf = NULL;
size_t gbe[2];
int part, gbeFileModified = 0;
uint8_t nvmPartModified[2];
@ -73,9 +75,10 @@ main(int argc, char *argv[])
char *strRMac = "??:??:??:??:??:??";
void (*cmd)(void) = NULL;
if ((gbe = (uint8_t *) malloc(SIZE_8KB)) == NULL)
if ((buf = (uint8_t *) malloc(SIZE_8KB)) == NULL)
err(errno, NULL);
gbe2 = gbe + SIZE_4KB;
gbe[0] = gbe[1] = (size_t) buf;
gbe[1] += SIZE_4KB;
nvmPartModified[0] = 0;
nvmPartModified[1] = 0;
@ -115,7 +118,7 @@ main(int argc, char *argv[])
if ((strMac == NULL) && (cmd == NULL))
errno = EINVAL;
else if (readFromFile(&fd, gbe, FILENAME, flags, SIZE_8KB) != SIZE_8KB)
else if (readFromFile(&fd, buf, FILENAME, flags, SIZE_8KB) != SIZE_8KB)
goto nvmutil_exit;
if (errno == 0) {
@ -355,16 +358,14 @@ void
cmd_swap(void)
{
int part0, part1;
size_t ptr;
part0 = validChecksum(0);
part1 = validChecksum(1);
if (part0 || part1) {
gbe2 = gbe;
ptr = (size_t) gbe;
ptr |= SIZE_4KB;
gbe = (uint8_t *) ptr;
gbe[0] ^= gbe[1];
gbe[1] ^= gbe[0];
gbe[0] ^= gbe[1];
gbeFileModified = 1;
nvmPartModified[0] = 1;
@ -378,10 +379,7 @@ void
cmd_copy(void)
{
if (validChecksum(part)) {
if (part)
gbe = gbe2;
else
gbe2 = gbe;
gbe[part ^ 1] = gbe[part];
gbeFileModified = 1;
nvmPartModified[part ^ 1] = 1;
@ -408,7 +406,7 @@ validChecksum(int partnum)
uint16_t
word(int pos16, int partnum)
{
uint16_t val16 = ((uint16_t *) gbe)[pos16 + (partnum << 11)];
uint16_t val16 = ((uint16_t *) buf)[pos16 + (partnum << 11)];
if (!little_endian)
byteswap((uint8_t *) &val16);
@ -418,9 +416,9 @@ word(int pos16, int partnum)
void
setWord(int pos16, int partnum, uint16_t val)
{
((uint16_t *) gbe)[pos16 + (partnum << 11)] = val;
((uint16_t *) buf)[pos16 + (partnum << 11)] = val;
if (!little_endian)
byteswap(gbe + (pos16 << 1) + (partnum << 12));
byteswap(buf + (pos16 << 1) + (partnum << 12));
gbeFileModified = 1;
nvmPartModified[partnum] = 1;
@ -440,9 +438,9 @@ writeGbeFile(int *fd, const char *filename)
int partnum;
errno = 0;
if (pwrite((*fd), gbe, SIZE_4KB, 0) != SIZE_4KB)
if (pwrite((*fd), (uint8_t *) gbe[0], SIZE_4KB, 0) != SIZE_4KB)
err(errno, "%s", filename);
if (pwrite((*fd), gbe2, SIZE_4KB, SIZE_4KB) != SIZE_4KB)
if (pwrite((*fd), (uint8_t *) gbe[1], SIZE_4KB, SIZE_4KB) != SIZE_4KB)
err(errno, "%s", filename);
if (close((*fd)))
err(errno, "%s", filename);