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elf: Expose ELF header on arch_setup_additional_pages()

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Like it is done for SET_PERSONALITY with ARM, which requires the ELF
header to select correct personality parameters, x86 requires the
headers when selecting which VDSO to load, instead of relying on the
going-away TIF_IA32/X32 flags.

Add an indirection macro to arch_setup_additional_pages(), that x86 can
reimplement to receive the extra parameter just for ELF files.  This
requires no changes to other architectures, who can continue to use the
original arch_setup_additional_pages for ELF and non-ELF binaries.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201004032536.1229030-8-krisman@collabora.com
This commit is contained in:
Gabriel Krisman Bertazi 2020-10-03 23:25:33 -04:00 committed by Thomas Gleixner
parent 2424b14605
commit 9a29a67190
3 changed files with 14 additions and 4 deletions
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2
fs/binfmt_elf.c
View File

@ -1246,7 +1246,7 @@ out_free_interp:
set_binfmt(&elf_format);
#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
retval = arch_setup_additional_pages(bprm, !!interpreter);
retval = ARCH_SETUP_ADDITIONAL_PAGES(bprm, elf_ex, !!interpreter);
if (retval < 0)
goto out;
#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */

11
fs/compat_binfmt_elf.c
View File

@ -115,11 +115,16 @@
#define START_THREAD COMPAT_START_THREAD
#endif
#ifdef compat_arch_setup_additional_pages
#ifdef compat_arch_setup_additional_pages
#define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \
compat_arch_setup_additional_pages(bprm, interpreter)
#endif
#ifdef COMPAT_ARCH_SETUP_ADDITIONAL_PAGES
#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
#undef arch_setup_additional_pages
#define arch_setup_additional_pages compat_arch_setup_additional_pages
#undef ARCH_SETUP_ADDITIONAL_PAGES
#define ARCH_SETUP_ADDITIONAL_PAGES COMPAT_ARCH_SETUP_ADDITIONAL_PAGES
#endif
#ifdef compat_elf_read_implies_exec

5
include/linux/elf.h
View File

@ -27,6 +27,11 @@
start_thread(regs, elf_entry, start_stack)
#endif
#if defined(ARCH_HAS_SETUP_ADDITIONAL_PAGES) && !defined(ARCH_SETUP_ADDITIONAL_PAGES)
#define ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \
arch_setup_additional_pages(bprm, interpreter)
#endif
#define ELF32_GNU_PROPERTY_ALIGN 4
#define ELF64_GNU_PROPERTY_ALIGN 8