mirror of
https://git.proxmox.com/git/efi-boot-shim
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d89b722ef7
When dir->Read() says bs=0, we shouldn't try to allocate a buffer and read into it. On edk2 this works because there's an implicit (possibly accidental) minimum size of one pool list entry that can be allocated, so you wind up getting (I think) 8 bytes. When Rob Clark tried to run this under uboot's emulated UEFI environment, dir->Read() returned 0 and when we passed that to AllocateZeroPool() less good things happened. So just check for that case and exit appropriately. Signed-off-by: Peter Jones <pjones@redhat.com> |
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| Cryptlib | ||
| include | ||
| lib | ||
| .gitignore | ||
| cert.S | ||
| COPYRIGHT | ||
| crypt_blowfish.c | ||
| crypt_blowfish.h | ||
| elf_aarch64_efi.lds | ||
| elf_arm_efi.lds | ||
| elf_ia32_efi.lds | ||
| elf_ia64_efi.lds | ||
| elf_x86_64_efi.lds | ||
| fallback.c | ||
| hexdump.h | ||
| httpboot.c | ||
| httpboot.h | ||
| make-certs | ||
| Makefile | ||
| MokManager.c | ||
| MokVars.txt | ||
| netboot.c | ||
| netboot.h | ||
| PasswordCrypt.c | ||
| PasswordCrypt.h | ||
| README | ||
| README.fallback | ||
| replacements.c | ||
| replacements.h | ||
| shim.c | ||
| shim.h | ||
| testplan.txt | ||
| TODO | ||
| tpm.c | ||
| tpm.h | ||
| ucs2.h | ||
| version.c.in | ||
| version.h | ||
shim is a trivial EFI application that, when run, attempts to open and execute another application. It will initially attempt to do this via the standard EFI LoadImage() and StartImage() calls. If these fail (because secure boot is enabled and the binary is not signed with an appropriate key, for instance) it will then validate the binary against a built-in certificate. If this succeeds and if the binary or signing key are not blacklisted then shim will relocate and execute the binary. shim will also install a protocol which permits the second-stage bootloader to perform similar binary validation. This protocol has a GUID as described in the shim.h header file and provides a single entry point. On 64-bit systems this entry point expects to be called with SysV ABI rather than MSABI, and so calls to it should not be wrapped. To use shim, simply place a DER-encoded public certificate in a file such as pub.cer and build with "make VENDOR_CERT_FILE=pub.cer".