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binfmt_elf_fdpic: support 64-bit systems

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The binfmt_flat_fdpic code has a number of 32-bit specific data
structures associated with it. Extend it to be able to support and
be used on 64-bit systems as well.

The new code defines a number of key 64-bit variants of the core
elf-fdpic data structures - along side the existing 32-bit sized ones.
A common set of generic named structures are defined to be either
the 32-bit or 64-bit ones as required at compile time. This is a
similar technique to that used in the ELF binfmt loader.

For example:

  elf_fdpic_loadseg is either elf32_fdpic_loadseg or elf64_fdpic_loadseg
  elf_fdpic_loadmap is either elf32_fdpic_loadmap or elf64_fdpic_loadmap

the choice based on ELFCLASS32 or ELFCLASS64.

Signed-off-by: Greg Ungerer <gerg@kernel.org>
Acked-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230711130754.481209-2-gerg@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Greg Ungerer
2023-07-11 23:07:53 +10:00
committed by Palmer Dabbelt
parent 06c2afb862
commit b922bf04d2
3 changed files with 47 additions and 20 deletions
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15
include/uapi/linux/elf-fdpic.h
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@@ -32,4 +32,19 @@ struct elf32_fdpic_loadmap {
#define ELF32_FDPIC_LOADMAP_VERSION 0x0000
/* segment mappings for ELF FDPIC libraries/executables/interpreters */
struct elf64_fdpic_loadseg {
Elf64_Addr addr; /* core address to which mapped */
Elf64_Addr p_vaddr; /* VMA recorded in file */
Elf64_Word p_memsz; /* allocation size recorded in file */
};
struct elf64_fdpic_loadmap {
Elf64_Half version; /* version of these structures, just in case... */
Elf64_Half nsegs; /* number of segments */
struct elf64_fdpic_loadseg segs[];
};
#define ELF64_FDPIC_LOADMAP_VERSION 0x0000
#endif /* _UAPI_LINUX_ELF_FDPIC_H */