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host/limine: Protect against overwriting beginning of partitions located too low

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This commit is contained in:
mintsuki 2024-07-11 02:26:50 +02:00
parent c6159230fb
commit adafd67028
1 changed files with 39 additions and 0 deletions
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39
host/limine.c
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@ -712,6 +712,7 @@ static int bios_install(int argc, char *argv[]) {
uint8_t hint8 = 0;
uint16_t hint16 = 0;
uint32_t hint32 = 0;
bool any_active = false;
@ -725,6 +726,14 @@ static int bios_install(int argc, char *argv[]) {
}
}
any_active = any_active || (hint8 & 0x80) != 0;
device_read(&hint8, 446 + 4, sizeof(uint8_t));
if (hint8 != 0x00) {
device_read(&hint32, 446 + 8, sizeof(uint32_t));
hint32 = ENDSWAP(hint32);
if (hint32 < 63) {
goto part_too_low;
}
}
device_read(&hint8, 462, sizeof(uint8_t));
if (hint8 != 0x00 && hint8 != 0x80) {
if (!force_mbr) {
@ -735,6 +744,14 @@ static int bios_install(int argc, char *argv[]) {
}
}
any_active = any_active || (hint8 & 0x80) != 0;
device_read(&hint8, 462 + 4, sizeof(uint8_t));
if (hint8 != 0x00) {
device_read(&hint32, 462 + 8, sizeof(uint32_t));
hint32 = ENDSWAP(hint32);
if (hint32 < 63) {
goto part_too_low;
}
}
device_read(&hint8, 478, sizeof(uint8_t));
if (hint8 != 0x00 && hint8 != 0x80) {
if (!force_mbr) {
@ -745,6 +762,14 @@ static int bios_install(int argc, char *argv[]) {
}
}
any_active = any_active || (hint8 & 0x80) != 0;
device_read(&hint8, 478 + 4, sizeof(uint8_t));
if (hint8 != 0x00) {
device_read(&hint32, 478 + 8, sizeof(uint32_t));
hint32 = ENDSWAP(hint32);
if (hint32 < 63) {
goto part_too_low;
}
}
device_read(&hint8, 494, sizeof(uint8_t));
if (hint8 != 0x00 && hint8 != 0x80) {
if (!force_mbr) {
@ -755,6 +780,20 @@ static int bios_install(int argc, char *argv[]) {
}
}
any_active = any_active || (hint8 & 0x80) != 0;
device_read(&hint8, 494 + 4, sizeof(uint8_t));
if (hint8 != 0x00) {
device_read(&hint32, 494 + 8, sizeof(uint32_t));
hint32 = ENDSWAP(hint32);
if (hint32 < 63) {
goto part_too_low;
}
}
if (0) {
part_too_low:
fprintf(stderr, "%s: error: A partition's start sector is less than 63, aborting.\n", program_name);
goto cleanup;
}
char hintc[64];
device_read(hintc, 4, 8);