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PhysicalMemory (FreeBSD): fix EFAULT errors

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Carter Li
2024-05-13 09:42:15 +08:00
parent b36b74448f
commit 68942c1d3f
1 changed files with 10 additions and 1 deletions
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src/util/smbiosHelper.c
+10 -1
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@@ -142,12 +142,21 @@ const FFSmbiosHeaderTable* ffGetSmbiosHeaderTable()
FFSmbios30EntryPoint entryPoint;
if (pread(fd, &entryPoint, sizeof(entryPoint), pEntry) != sizeof(entryPoint))
return NULL;
{
// `pread /dev/mem` returns EFAULT in FreeBSD
// https://stackoverflow.com/questions/69372330/how-to-read-dev-mem-using-read
void* p = mmap(NULL, sizeof(entryPoint), PROT_READ, MAP_SHARED, fd, pEntry);
if (p == MAP_FAILED) return NULL;
memcpy(&entryPoint, p, sizeof(entryPoint));
munmap(p, sizeof(entryPoint));
}
if (memcmp(entryPoint.AnchorString, "_SM3_", sizeof(entryPoint.AnchorString)) != 0 ||
entryPoint.EntryPointLength != sizeof(entryPoint))
return NULL;
// entryPoint.StructureTableAddress must be page aligned.
// Unaligned physical memory access results in all kinds of crashes.
buffer = mmap(NULL, entryPoint.StructureTableMaximumSize, PROT_READ, MAP_SHARED, fd, (loff_t) entryPoint.StructureTableAddress);
if (buffer == MAP_FAILED)
{