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block: better checks to see if partition entry is valid

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Matheus
2026-04-24 23:49:58 -03:00
parent 6c88e67d97
commit 5a033707cc
1 changed files with 20 additions and 1 deletions
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kernel-src/io/block/block.c
+20 -1
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@@ -220,6 +220,25 @@ static int detectpart(blockdesc_t *desc) {
return ret;
}
static bool gptentryvalid(blockdesc_t *desc, gptheader_t *header, gptentry_t *entry) {
if (entry->typeguid[0] == 0 && entry->typeguid[1] == 0)
return false;
if (entry->guid[0] == 0 && entry->guid[1] == 0)
return false;
if (entry->startlba > entry->endlba)
return false;
if (entry->startlba < header->firstusable || entry->endlba > header->lastusable)
return false;
if (entry->endlba >= desc->blockcapacity)
return false;
return true;
}
static void dogpt(blockdesc_t *desc, char *name) {
// get header
void *lba1 = vmm_map(NULL, desc->blocksize, VMM_FLAGS_ALLOCATE, MAP_FLAGS, NULL);
@@ -242,7 +261,7 @@ static void dogpt(blockdesc_t *desc, char *name) {
for (int i = 0; i < header->entrycount; ++i) {
gptentry_t *entry = (gptentry_t *)((uintptr_t)tablebuffer + header->entrybytesize * i);
if (entry->typeguid[0] == 0 && entry->typeguid[1] == 0)
if (gptentryvalid(desc, header, entry) == false)
continue;
snprintf(partname, namebuflen, "%sp%d", name, partid++);