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efi_loader: don't load beyond VirtualSize

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PE section table entries' SizeOfRawData must be a multiple of
FileAlignment, and thus may be rounded up and larger than their
VirtualSize.

We should not load beyond the VirtualSize, which is "the total size of
the section when loaded into memory" -- we may clobber real data at the
target in some other section, since we load sections in reverse order
and sections are usually laid out sequentially.

Signed-off-by: Asherah Connor <ashe@kivikakk.ee>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Asherah Connor 2021-02-09 06:19:48 +00:00 • committed by Heinrich Schuchardt
parent 7c82e12cc4
commit 9d30a941cc
1 changed files with 1 additions and 1 deletions
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lib/efi_loader/efi_image_loader.c
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@ -843,7 +843,7 @@ efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle,
sec->Misc.VirtualSize);
memcpy(efi_reloc + sec->VirtualAddress,
efi + sec->PointerToRawData,
sec->SizeOfRawData);
min(sec->Misc.VirtualSize, sec->SizeOfRawData));
}
/* Run through relocations */