36 lines
1.2 KiB
Diff
36 lines
1.2 KiB
Diff
diff --git a/libelf/gelf_getnote.c b/libelf/gelf_getnote.c
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index 0f7b9d68..6ef970c5 100644
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--- a/libelf/gelf_getnote.c
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+++ b/libelf/gelf_getnote.c
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@@ -31,6 +31,7 @@
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#endif
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#include <assert.h>
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+#include <byteswap.h>
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#include <gelf.h>
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#include <string.h>
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@@ -73,6 +74,22 @@ gelf_getnote (Elf_Data *data, size_t offset, GElf_Nhdr *result,
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offset = 0;
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else
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{
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+ /* Workaround FDO package notes on big-endian systems,
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+ getting namesz and descsz wrong. Detect it by getting
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+ a bad namesz, descsz and byte swapped n_type for
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+ NT_FDO_PACKAGING_METADATA. */
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+ if (unlikely (n->n_type == bswap_32 (NT_FDO_PACKAGING_METADATA)
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+ && n->n_namesz > data->d_size
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+ && n->n_descsz > data->d_size))
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+ {
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+ /* n might not be writable, use result and redirect n. */
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+ *result = *n;
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+ result->n_type = bswap_32 (n->n_type);
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+ result->n_namesz = bswap_32 (n->n_namesz);
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+ result->n_descsz = bswap_32 (n->n_descsz);
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+ n = result;
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+ }
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+
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/* This is slightly tricky, offset is guaranteed to be 4
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byte aligned, which is what we need for the name_offset.
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And normally desc_offset is also 4 byte aligned, but not
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