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boot: fallback to unrestricted allocation if initrd allocation doesn't fit below 4g (#36715)

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Fixes: #36706
This commit is contained in:
Lennart Poettering 2025-03-12 20:14:40 +01:00 committed by GitHub
parent f9ddbc5b35
commit c5a5046792
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1 changed files with 16 additions and 10 deletions
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26
src/boot/util.h
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@ -103,26 +103,32 @@ static inline Pages xmalloc_pages(
}
static inline Pages xmalloc_initrd_pages(size_t n_pages) {
/* The original native x86 boot protocol of the Linux kernel was not 64bit safe, hence we allocate
* memory for the initrds below the 4G boundary on x86, since we don't know early enough which
* protocol we'll use to ultimately boot the kernel. This restriction is somewhat obsolete, since
* these days we generally prefer the kernel's newer EFI entrypoint instead, which has no such
* limitations. On other architectures we do not bother with any restriction on this, in particular
* as some of them don't even have RAM mapped to such low addresses. */
/* The original native x86 boot protocol of the Linux kernel was not 64bit safe, hence we try to
* allocate memory for the initrds below the 4G boundary on x86, since we don't know early enough
* which protocol we'll use to ultimately boot the kernel. This restriction is somewhat obsolete,
* since these days we generally prefer the kernel's newer EFI entrypoint instead, which has no such
* limitations. There's a good chance that for large allocations we won't be successful, hence
* immediately fallback to an unrestricted allocation. On other architectures we do not bother with
* any restriction on this, in particular as some of them don't even have RAM mapped to such low
* addresses. */
#if defined(__i386__) || defined(__x86_64__)
return xmalloc_pages(
EFI_PHYSICAL_ADDRESS addr = UINT32_MAX; /* Below 4G boundary. */
if (BS->AllocatePages(
AllocateMaxAddress,
EfiLoaderData,
EFI_SIZE_TO_PAGES(n_pages),
UINT32_MAX /* Below 4G boundary. */);
#else
&addr) == EFI_SUCCESS)
return (Pages) {
.addr = addr,
.n_pages = n_pages,
};
#endif
return xmalloc_pages(
AllocateAnyPages,
EfiLoaderData,
EFI_SIZE_TO_PAGES(n_pages),
0 /* Ignored. */);
#endif
}
void convert_efi_path(char16_t *path);