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| author | Arvind Sankar <nivedita@alum.mit.edu> | 2020-10-11 10:20:12 -0400 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2020-10-26 08:06:36 +0100 |
| commit | 688eb28211abdf82a3f51e8997f1c8137947227d (patch) | |
| tree | 23baec172b555cb0efd66668a796440358999715 /drivers | |
| parent | bc13809f1c47245cd584f4ad31ad06a5c5f40e54 (diff) | |
| download | linux-stable-688eb28211abdf82a3f51e8997f1c8137947227d.tar.gz linux-stable-688eb28211abdf82a3f51e8997f1c8137947227d.tar.bz2 linux-stable-688eb28211abdf82a3f51e8997f1c8137947227d.zip | |
efi/x86: Only copy the compressed kernel image in efi_relocate_kernel()
The image_size argument to efi_relocate_kernel() is currently specified
as init_size, but this is unnecessarily large. The compressed kernel is
much smaller, in fact, its image only extends up to the start of _bss,
since at this point, the .bss section is still uninitialized.
Depending on compression level, this can reduce the amount of data
copied by 4-5x.
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20201011142012.96493-1-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/firmware/efi/libstub/x86-stub.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c index 3672539cb96e..f14c4ff5839f 100644 --- a/drivers/firmware/efi/libstub/x86-stub.c +++ b/drivers/firmware/efi/libstub/x86-stub.c @@ -715,8 +715,11 @@ unsigned long efi_main(efi_handle_t handle, (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE) || (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) || (image_offset == 0)) { + extern char _bss[]; + status = efi_relocate_kernel(&bzimage_addr, - hdr->init_size, hdr->init_size, + (unsigned long)_bss - bzimage_addr, + hdr->init_size, hdr->pref_address, hdr->kernel_alignment, LOAD_PHYSICAL_ADDR); |