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SBAT: parse a copy of the table that's got a NUL at the end

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Right now we allocate the PE file's contents in RW memory, but hopefully
that won't always be the case.  Our SBAT parsing, however, very much
expects to be able to edit it.  We also don't actually know that shim's
.sbat section is loaded r/w, so we can't necessarily write there.

This patch copies the SBAT data to its own buffer, plus one NUL byte at
the end, so we can always be sure that will work.

Signed-off-by: Peter Jones <pjones@redhat.com>
This commit is contained in:
Peter Jones 2021-02-09 20:02:26 -05:00
parent ee8f7ed332
commit 6b8ef61a1a
1 changed files with 13 additions and 1 deletions
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14
pe.c
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@ -1045,7 +1045,19 @@ handle_image (void *data, unsigned int datasize,
struct sbat_entry *entry = NULL;
if (SBATBase && SBATSize) {
res = parse_sbat(SBATBase, SBATSize, buffer, &sbat);
char *sbat_data;
size_t sbat_size;
sbat_size = SBATSize + 1;
sbat_data = AllocatePool(sbat_size);
if (!sbat_data) {
console_print(L"Failed to allocate SBAT buffer\n");
return EFI_OUT_OF_RESOURCES;
}
CopyMem(sbat_data, SBATBase, SBATSize);
sbat_data[SBATSize] = '\0';
res = parse_sbat(sbat_data, sbat_size, buffer, &sbat);
if (res < 0) {
console_print(L"SBAT data not correct: %r\n", res);
return EFI_UNSUPPORTED;