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[stage2] raw_mmc_dev.c: fix various bugs

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TuxSH 2018-05-10 00:36:13 +02:00
parent 3273cc5357
commit 20c225c829
1 changed files with 49 additions and 67 deletions
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116
fusee/fusee-secondary/src/raw_mmc_dev.c
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@ -185,8 +185,8 @@ static int rawmmcdev_open(struct _reent *r, void *fileStruct, const char *path,
return -1; return -1;
} }
/* Only allow R/W flags, and O_CREAT which is no-op in this case. */ /* Forbid some flags that we explicitely don't support.*/
if (flags & ~(O_ACCMODE | O_CREAT)) { if (flags & (O_APPEND | O_TRUNC | O_EXCL)) {
r->_errno = EINVAL; r->_errno = EINVAL;
return -1; return -1;
} }
@ -205,14 +205,15 @@ static int rawmmcdev_close(struct _reent *r, void *fd) {
return 0; return 0;
} }
static ssize_t rawmmcdev_write(struct _reent *r, void *fd, const char *ptr, size_t len) { /* Keep this <= the size of the DMA bounce buffer in sdmmc.c */
static __attribute__((aligned(16))) uint8_t crypt_buf[4096] = {0}; static __attribute__((aligned(16))) uint8_t g_crypto_buffer[4096 * 4] = {0};
static ssize_t rawmmcdev_write(struct _reent *r, void *fd, const char *ptr, size_t len) {
rawmmcdev_file_t *f = (rawmmcdev_file_t *)fd; rawmmcdev_file_t *f = (rawmmcdev_file_t *)fd;
rawmmcdev_device_t *device = f->device; rawmmcdev_device_t *device = f->device;
uint32_t device_sector_offset = (uint32_t)(device->offset / 512); uint32_t device_sector_offset = (uint32_t)(device->offset / 512);
uint32_t sector_begin = (uint32_t)((device->offset + f->offset) / 512); /* NAND offset */ uint32_t sector_begin = (uint32_t)((device->offset + f->offset) / 512); /* NAND offset */
uint32_t sector_end = (uint32_t)(512 * (device->offset + f->offset + len + 511) / 512); uint32_t sector_end = (uint32_t)((device->offset + f->offset + len + 511) / 512);
uint32_t sector_end_aligned = sector_end - ((f->offset + len) % 512 != 0 ? 1 : 0); uint32_t sector_end_aligned = sector_end - ((f->offset + len) % 512 != 0 ? 1 : 0);
uint32_t current_sector = sector_begin; uint32_t current_sector = sector_begin;
const uint8_t *data = (const uint8_t *)ptr; const uint8_t *data = (const uint8_t *)ptr;
@ -232,19 +233,19 @@ static ssize_t rawmmcdev_write(struct _reent *r, void *fd, const char *ptr, size
/* Unaligned at the start, we need to read the sector and incorporate the data. */ /* Unaligned at the start, we need to read the sector and incorporate the data. */
if (f->offset % 512 != 0) { if (f->offset % 512 != 0) {
no = sdmmc_read(device->mmc, crypt_buf, sector_begin, 1); no = sdmmc_read(device->mmc, g_crypto_buffer, sector_begin, 1);
if (no != 0) { if (no != 0) {
r->_errno = no; r->_errno = no;
return -1; return -1;
} }
if (device->encrypted) { if (device->encrypted) {
device->read_crypt_func(crypt_buf, crypt_buf, 512 * (sector_begin - device_sector_offset), 512, device->iv, device->crypt_flags); device->read_crypt_func(g_crypto_buffer, g_crypto_buffer, 512 * (sector_begin - device_sector_offset), 512, device->iv, device->crypt_flags);
} }
memcpy(crypt_buf, data, len <= (512 - (f->offset % 512)) ? len : 512 - (f->offset % 512)); memcpy(g_crypto_buffer, data, len <= (512 - (f->offset % 512)) ? len : 512 - (f->offset % 512));
if (device->encrypted) { if (device->encrypted) {
device->write_crypt_func(crypt_buf, crypt_buf, 512 * (sector_begin - device_sector_offset), 512, device->iv, device->crypt_flags); device->write_crypt_func(g_crypto_buffer, g_crypto_buffer, 512 * (sector_begin - device_sector_offset), 512, device->iv, device->crypt_flags);
} }
no = sdmmc_write(device->mmc, crypt_buf, sector_begin, 1); no = sdmmc_write(device->mmc, g_crypto_buffer, sector_begin, 1);
if (no != 0) { if (no != 0) {
r->_errno = no; r->_errno = no;
return -1; return -1;
@ -261,52 +262,42 @@ static ssize_t rawmmcdev_write(struct _reent *r, void *fd, const char *ptr, size
return len; return len;
} }
if (device->encrypted) { size_t sectors_remaining = sector_end_aligned - current_sector;
size_t sectors_remaining = sector_end_aligned - current_sector; for (size_t i = 0; i < len; i += sizeof(g_crypto_buffer)/512) {
for (size_t i = 0; i < len; i += sizeof(crypt_buf)/512) { size_t n = sectors_remaining <= sizeof(g_crypto_buffer)/512 ? sectors_remaining : sizeof(g_crypto_buffer)/512;
size_t n = sectors_remaining <= sizeof(crypt_buf)/512 ? sectors_remaining : sizeof(crypt_buf)/512;
memcpy(crypt_buf, data, 512 * n); if (device->encrypted) {
device->write_crypt_func(crypt_buf, crypt_buf, current_sector - device_sector_offset, 512 * n, device->iv, device->crypt_flags); memcpy(g_crypto_buffer, data, 512 * n);
device->write_crypt_func(g_crypto_buffer, g_crypto_buffer, current_sector - device_sector_offset, 512 * n, device->iv, device->crypt_flags);
no = sdmmc_write(device->mmc, crypt_buf, current_sector, n); no = sdmmc_write(device->mmc, g_crypto_buffer, current_sector, n);
if (no != 0) { } else {
r->_errno = no; no = sdmmc_write(device->mmc, data, current_sector, n);
return -1;
}
data += 512 * n;
current_sector++;
} }
} else {
/* We can write everything aligned at once. */
size_t sectors_remaining = sector_end_aligned - current_sector;
no = sdmmc_write(device->mmc, data, current_sector, sectors_remaining);
if (no != 0) { if (no != 0) {
r->_errno = no; r->_errno = no;
return -1; return -1;
} }
data += 512 * sectors_remaining; data += 512 * n;
current_sector += sectors_remaining; current_sector += n;
} }
/* Unaligned at the end, we need to read the sector and incorporate the data. */ /* Unaligned at the end, we need to read the sector and incorporate the data. */
if (sector_end != sector_end_aligned) { if (sector_end != sector_end_aligned) {
no = sdmmc_read(device->mmc, crypt_buf, sector_end_aligned, 1); no = sdmmc_read(device->mmc, g_crypto_buffer, sector_end_aligned, 1);
if (no != 0) { if (no != 0) {
r->_errno = no; r->_errno = no;
return -1; return -1;
} }
if (device->encrypted) { if (device->encrypted) {
device->read_crypt_func(crypt_buf, crypt_buf, 512 * (sector_end_aligned - device_sector_offset), 512, device->iv, device->crypt_flags); device->read_crypt_func(g_crypto_buffer, g_crypto_buffer, 512 * (sector_end_aligned - device_sector_offset), 512, device->iv, device->crypt_flags);
} }
memcpy(crypt_buf, data, (f->offset + len) % 512); memcpy(g_crypto_buffer, data, (f->offset + len) % 512);
if (device->encrypted) { if (device->encrypted) {
device->write_crypt_func(crypt_buf, crypt_buf, 512 * (sector_end_aligned - device_sector_offset), 512, device->iv, device->crypt_flags); device->write_crypt_func(g_crypto_buffer, g_crypto_buffer, 512 * (sector_end_aligned - device_sector_offset), 512, device->iv, device->crypt_flags);
} }
no = sdmmc_write(device->mmc, crypt_buf, sector_end_aligned, 1); no = sdmmc_write(device->mmc, g_crypto_buffer, sector_end_aligned, 1);
if (no != 0) { if (no != 0) {
r->_errno = no; r->_errno = no;
return -1; return -1;
@ -322,13 +313,11 @@ static ssize_t rawmmcdev_write(struct _reent *r, void *fd, const char *ptr, size
} }
static ssize_t rawmmcdev_read(struct _reent *r, void *fd, char *ptr, size_t len) { static ssize_t rawmmcdev_read(struct _reent *r, void *fd, char *ptr, size_t len) {
static __attribute__((aligned(16))) uint8_t crypt_buf[4096] = {0};
rawmmcdev_file_t *f = (rawmmcdev_file_t *)fd; rawmmcdev_file_t *f = (rawmmcdev_file_t *)fd;
rawmmcdev_device_t *device = f->device; rawmmcdev_device_t *device = f->device;
uint32_t device_sector_offset = (uint32_t)(device->offset / 512); uint32_t device_sector_offset = (uint32_t)(device->offset / 512);
uint32_t sector_begin = (uint32_t)((device->offset + f->offset) / 512); /* NAND offset */ uint32_t sector_begin = (uint32_t)((device->offset + f->offset) / 512); /* NAND offset */
uint32_t sector_end = (uint32_t)(512 * (device->offset + f->offset + len + 511) / 512); uint32_t sector_end = (uint32_t)((device->offset + f->offset + len + 511) / 512);
uint32_t sector_end_aligned = sector_end - ((f->offset + len) % 512 != 0 ? 1 : 0); uint32_t sector_end_aligned = sector_end - ((f->offset + len) % 512 != 0 ? 1 : 0);
uint32_t current_sector = sector_begin; uint32_t current_sector = sector_begin;
uint8_t *data = (uint8_t *)ptr; uint8_t *data = (uint8_t *)ptr;
@ -348,15 +337,15 @@ static ssize_t rawmmcdev_read(struct _reent *r, void *fd, char *ptr, size_t len)
/* Unaligned at the start. */ /* Unaligned at the start. */
if (f->offset % 512 != 0) { if (f->offset % 512 != 0) {
no = sdmmc_read(device->mmc, crypt_buf, sector_begin, 1); no = sdmmc_read(device->mmc, g_crypto_buffer, sector_begin, 1);
if (no != 0) { if (no != 0) {
r->_errno = no; r->_errno = no;
return -1; return -1;
} }
if (device->encrypted) { if (device->encrypted) {
device->read_crypt_func(crypt_buf, crypt_buf, 512 * (sector_begin - device_sector_offset), 512, device->iv, device->crypt_flags); device->read_crypt_func(g_crypto_buffer, g_crypto_buffer, 512 * (sector_begin - device_sector_offset), 512, device->iv, device->crypt_flags);
} }
memcpy(data, crypt_buf + (f->offset % 512), len <= (512 - (f->offset % 512)) ? len : 512 - (f->offset % 512)); memcpy(data, g_crypto_buffer + (f->offset % 512), len <= (512 - (f->offset % 512)) ? len : 512 - (f->offset % 512));
/* Advance */ /* Advance */
data += 512 - (f->offset % 512); data += 512 - (f->offset % 512);
@ -368,48 +357,41 @@ static ssize_t rawmmcdev_read(struct _reent *r, void *fd, char *ptr, size_t len)
return 0; return 0;
} }
if (device->encrypted) { size_t sectors_remaining = sector_end_aligned - current_sector;
size_t sectors_remaining = sector_end_aligned - current_sector; for (size_t i = 0; i < len; i += sizeof(g_crypto_buffer)/512) {
for (size_t i = 0; i < sectors_remaining; i += sizeof(crypt_buf)/512) { size_t n = sectors_remaining <= sizeof(g_crypto_buffer)/512 ? sectors_remaining : sizeof(g_crypto_buffer)/512;
size_t n = sectors_remaining <= sizeof(crypt_buf)/512 ? sectors_remaining : sizeof(crypt_buf)/512;
no = sdmmc_read(device->mmc, crypt_buf, current_sector, n); if (device->encrypted) {
no = sdmmc_read(device->mmc, g_crypto_buffer, current_sector, n);
if (no != 0) {
r->_errno = no;
return -1;
}
device->read_crypt_func(g_crypto_buffer, g_crypto_buffer, current_sector - device_sector_offset, 512 * n, device->iv, device->crypt_flags);
memcpy(data, g_crypto_buffer, 512 * n);
} else {
no = sdmmc_read(device->mmc, data, current_sector, n);
if (no != 0) { if (no != 0) {
r->_errno = no; r->_errno = no;
return -1; return -1;
} }
device->read_crypt_func(crypt_buf, crypt_buf, current_sector - device_sector_offset, 512 * n, device->iv, device->crypt_flags);
memcpy(data, crypt_buf, 512 * n);
data += 512 * n;
current_sector++;
}
} else {
/* We can read everything aligned at once. */
size_t sectors_remaining = sector_end_aligned - current_sector;
no = sdmmc_read(device->mmc, data, current_sector, sectors_remaining);
if (no != 0) {
r->_errno = no;
return -1;
} }
data += 512 * sectors_remaining; data += 512 * n;
current_sector += sectors_remaining; current_sector += n;
} }
/* Unaligned at the end, we need to read the sector and incorporate the data. */ /* Unaligned at the end, we need to read the sector and incorporate the data. */
if (sector_end != sector_end_aligned) { if (sector_end != sector_end_aligned) {
no = sdmmc_read(device->mmc, crypt_buf, sector_end_aligned, 1); no = sdmmc_read(device->mmc, g_crypto_buffer, sector_end_aligned, 1);
if (no != 0) { if (no != 0) {
r->_errno = no; r->_errno = no;
return -1; return -1;
} }
if (device->encrypted) { if (device->encrypted) {
device->read_crypt_func(crypt_buf, crypt_buf, 512 * (sector_end_aligned - device_sector_offset), 512, device->iv, device->crypt_flags); device->read_crypt_func(g_crypto_buffer, g_crypto_buffer, 512 * (sector_end_aligned - device_sector_offset), 512, device->iv, device->crypt_flags);
} }
memcpy(data, crypt_buf, (f->offset + len) % 512); memcpy(data, g_crypto_buffer, (f->offset + len) % 512);
/* Advance */ /* Advance */
data += 512 - (f->offset % 512); data += 512 - (f->offset % 512);