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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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bc3d7bf61a
Like it is done for SET_PERSONALITY with x86, which requires the ELF header to select correct personality parameters, x86 requires the headers on compat_start_thread() to choose starting CS for ELF32 binaries, instead of relying on the going-away TIF_IA32/X32 flags. Add an indirection macro to ELF invocations of START_THREAD, that x86 can reimplement to receive the extra parameter just for ELF files. This requires no changes to other architectures who don't need the header information, they can continue to use the original start_thread for ELF and non-ELF binaries, and it prevents affecting non-ELF code paths for x86. Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20201004032536.1229030-6-krisman@collabora.com
107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_ELF_H
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#define _LINUX_ELF_H
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#include <linux/types.h>
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#include <asm/elf.h>
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#include <uapi/linux/elf.h>
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#ifndef elf_read_implies_exec
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/* Executables for which elf_read_implies_exec() returns TRUE will
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have the READ_IMPLIES_EXEC personality flag set automatically.
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Override in asm/elf.h as needed. */
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# define elf_read_implies_exec(ex, have_pt_gnu_stack) 0
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#endif
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#ifndef SET_PERSONALITY
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#define SET_PERSONALITY(ex) \
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set_personality(PER_LINUX | (current->personality & (~PER_MASK)))
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#endif
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#ifndef SET_PERSONALITY2
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#define SET_PERSONALITY2(ex, state) \
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SET_PERSONALITY(ex)
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#endif
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#ifndef START_THREAD
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#define START_THREAD(elf_ex, regs, elf_entry, start_stack) \
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start_thread(regs, elf_entry, start_stack)
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#endif
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#define ELF32_GNU_PROPERTY_ALIGN 4
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#define ELF64_GNU_PROPERTY_ALIGN 8
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#if ELF_CLASS == ELFCLASS32
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extern Elf32_Dyn _DYNAMIC [];
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#define elfhdr elf32_hdr
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#define elf_phdr elf32_phdr
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#define elf_shdr elf32_shdr
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#define elf_note elf32_note
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#define elf_addr_t Elf32_Off
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#define Elf_Half Elf32_Half
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#define Elf_Word Elf32_Word
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#define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN
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#else
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extern Elf64_Dyn _DYNAMIC [];
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#define elfhdr elf64_hdr
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#define elf_phdr elf64_phdr
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#define elf_shdr elf64_shdr
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#define elf_note elf64_note
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#define elf_addr_t Elf64_Off
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#define Elf_Half Elf64_Half
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#define Elf_Word Elf64_Word
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#define ELF_GNU_PROPERTY_ALIGN ELF64_GNU_PROPERTY_ALIGN
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#endif
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/* Optional callbacks to write extra ELF notes. */
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struct file;
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struct coredump_params;
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#ifndef ARCH_HAVE_EXTRA_ELF_NOTES
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static inline int elf_coredump_extra_notes_size(void) { return 0; }
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static inline int elf_coredump_extra_notes_write(struct coredump_params *cprm) { return 0; }
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#else
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extern int elf_coredump_extra_notes_size(void);
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extern int elf_coredump_extra_notes_write(struct coredump_params *cprm);
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#endif
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/*
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* NT_GNU_PROPERTY_TYPE_0 header:
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* Keep this internal until/unless there is an agreed UAPI definition.
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* pr_type values (GNU_PROPERTY_*) are public and defined in the UAPI header.
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*/
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struct gnu_property {
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u32 pr_type;
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u32 pr_datasz;
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};
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struct arch_elf_state;
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#ifndef CONFIG_ARCH_USE_GNU_PROPERTY
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static inline int arch_parse_elf_property(u32 type, const void *data,
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size_t datasz, bool compat,
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struct arch_elf_state *arch)
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{
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return 0;
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}
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#else
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extern int arch_parse_elf_property(u32 type, const void *data, size_t datasz,
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bool compat, struct arch_elf_state *arch);
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#endif
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#ifdef CONFIG_ARCH_HAVE_ELF_PROT
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int arch_elf_adjust_prot(int prot, const struct arch_elf_state *state,
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bool has_interp, bool is_interp);
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#else
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static inline int arch_elf_adjust_prot(int prot,
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const struct arch_elf_state *state,
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bool has_interp, bool is_interp)
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{
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return prot;
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}
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#endif
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#endif /* _LINUX_ELF_H */
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