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| author | Dan Williams <[email protected]> | 2020-01-13 18:22:44 +0100 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2020-01-20 08:14:29 +0100 |
| commit | f0ef6523475f18ccd213e22ee593dfd131a2c5ea (patch) | |
| tree | a0f2df98870bb25830765bc735ef282c83fefc0a /scripts/bpf_helpers_doc.py | |
| parent | 1db91035d01aa8bfa2350c00ccb63d629b4041ad (diff) | |
efi: Fix efi_memmap_alloc() leaks
With efi_fake_memmap() and efi_arch_mem_reserve() the efi table may be
updated and replaced multiple times. When that happens a previous
dynamically allocated efi memory map can be garbage collected. Use the
new EFI_MEMMAP_{SLAB,MEMBLOCK} flags to detect when a dynamically
allocated memory map is being replaced.
Debug statements in efi_memmap_free() reveal:
efi: __efi_memmap_free:37: phys: 0x23ffdd580 size: 2688 flags: 0x2
efi: __efi_memmap_free:37: phys: 0x9db00 size: 2640 flags: 0x2
efi: __efi_memmap_free:37: phys: 0x9e580 size: 2640 flags: 0x2
...a savings of 7968 bytes on a qemu boot with 2 entries specified to
efi_fake_mem=.
[ ardb: added a comment to clarify that efi_memmap_free() does nothing when
called from efi_clean_memmap(), i.e., with data->flags == 0x0 ]
Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'scripts/bpf_helpers_doc.py')
0 files changed, 0 insertions, 0 deletions