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-rw-r--r--pc-bios/s390-ccw/bootmap.c90
-rw-r--r--pc-bios/s390-ccw/bootmap.h7
2 files changed, 97 insertions, 0 deletions
diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c
index 82cca9c9e8..415508b279 100644
--- a/pc-bios/s390-ccw/bootmap.c
+++ b/pc-bios/s390-ccw/bootmap.c
@@ -462,6 +462,87 @@ static bool is_iso_bc_entry_compatible(IsoBcSection *s)
return !_memcmp(magic_sec + 8, linux_s390_magic, 24);
}
+/* Location of the current sector of the directory */
+static uint32_t sec_loc[ISO9660_MAX_DIR_DEPTH];
+/* Offset in the current sector of the directory */
+static uint32_t sec_offset[ISO9660_MAX_DIR_DEPTH];
+/* Remained directory space in bytes */
+static uint32_t dir_rem[ISO9660_MAX_DIR_DEPTH];
+
+static inline uint32_t iso_get_file_size(uint32_t load_rba)
+{
+ IsoVolDesc *vd = (IsoVolDesc *)sec;
+ IsoDirHdr *cur_record = &vd->vd.primary.rootdir;
+ uint8_t *temp = sec + ISO_SECTOR_SIZE;
+ int level = 0;
+
+ read_iso_sector(ISO_PRIMARY_VD_SECTOR, sec,
+ "Failed to read ISO primary descriptor");
+ sec_loc[0] = iso_733_to_u32(cur_record->ext_loc);
+ dir_rem[0] = 0;
+ sec_offset[0] = 0;
+
+ while (level >= 0) {
+ IPL_assert(sec_offset[level] <= ISO_SECTOR_SIZE,
+ "Directory tree structure violation");
+
+ cur_record = (IsoDirHdr *)(temp + sec_offset[level]);
+
+ if (sec_offset[level] == 0) {
+ read_iso_sector(sec_loc[level], temp,
+ "Failed to read ISO directory");
+ if (dir_rem[level] == 0) {
+ /* Skip self and parent records */
+ dir_rem[level] = iso_733_to_u32(cur_record->data_len) -
+ cur_record->dr_len;
+ sec_offset[level] += cur_record->dr_len;
+
+ cur_record = (IsoDirHdr *)(temp + sec_offset[level]);
+ dir_rem[level] -= cur_record->dr_len;
+ sec_offset[level] += cur_record->dr_len;
+ continue;
+ }
+ }
+
+ if (!cur_record->dr_len || sec_offset[level] == ISO_SECTOR_SIZE) {
+ /* Zero-padding and/or the end of current sector */
+ dir_rem[level] -= ISO_SECTOR_SIZE - sec_offset[level];
+ sec_offset[level] = 0;
+ sec_loc[level]++;
+ } else {
+ /* The directory record is valid */
+ if (load_rba == iso_733_to_u32(cur_record->ext_loc)) {
+ return iso_733_to_u32(cur_record->data_len);
+ }
+
+ dir_rem[level] -= cur_record->dr_len;
+ sec_offset[level] += cur_record->dr_len;
+
+ if (cur_record->file_flags & 0x2) {
+ /* Subdirectory */
+ if (level == ISO9660_MAX_DIR_DEPTH - 1) {
+ sclp_print("ISO-9660 directory depth limit exceeded\n");
+ } else {
+ level++;
+ sec_loc[level] = iso_733_to_u32(cur_record->ext_loc);
+ sec_offset[level] = 0;
+ dir_rem[level] = 0;
+ continue;
+ }
+ }
+ }
+
+ if (dir_rem[level] == 0) {
+ /* Nothing remaining */
+ level--;
+ read_iso_sector(sec_loc[level], temp,
+ "Failed to read ISO directory");
+ }
+ }
+
+ return 0;
+}
+
static void load_iso_bc_entry(IsoBcSection *load)
{
IsoBcSection s = *load;
@@ -470,6 +551,15 @@ static void load_iso_bc_entry(IsoBcSection *load)
* is padded and ISO_SECTOR_SIZE bytes aligned
*/
uint32_t blks_to_load = bswap16(s.sector_count) >> ET_SECTOR_SHIFT;
+ uint32_t real_size = iso_get_file_size(bswap32(s.load_rba));
+
+ if (real_size) {
+ /* Round up blocks to load */
+ blks_to_load = (real_size + ISO_SECTOR_SIZE - 1) / ISO_SECTOR_SIZE;
+ sclp_print("ISO boot image size verified\n");
+ } else {
+ sclp_print("ISO boot image size could not be verified\n");
+ }
read_iso_boot_image(bswap32(s.load_rba),
(void *)((uint64_t)bswap16(s.load_segment)),
diff --git a/pc-bios/s390-ccw/bootmap.h b/pc-bios/s390-ccw/bootmap.h
index cc77fd753c..f98765b841 100644
--- a/pc-bios/s390-ccw/bootmap.h
+++ b/pc-bios/s390-ccw/bootmap.h
@@ -381,6 +381,11 @@ static inline uint64_t bswap64(uint64_t x)
((x & 0xff00000000000000ULL) >> 56);
}
+static inline uint32_t iso_733_to_u32(uint64_t x)
+{
+ return (uint32_t)x;
+}
+
#define ISO_SECTOR_SIZE 2048
/* El Torito specifies boot image size in 512 byte blocks */
#define ET_SECTOR_SHIFT 2
@@ -407,6 +412,8 @@ static inline void read_iso_boot_image(uint32_t block_offset, void *load_addr,
const uint8_t el_torito_magic[] = "EL TORITO SPECIFICATION"
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
+#define ISO9660_MAX_DIR_DEPTH 8
+
typedef struct IsoDirHdr {
uint8_t dr_len;
uint8_t ear_len;