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arm64: cleanup {COMPAT_,}SET_PERSONALITY() macro 

There is some work that should be done after setting the personality.
Currently it's done in the macro, which is not the best idea.

In this patch new arch_setup_new_exec() routine is introduced, and all
setup code is moved there, as suggested by Catalin:
https://lkml.org/lkml/2017/8/4/494

Cc: Pratyush Anand <panand@redhat.com>
Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
[catalin.marinas@arm.com: comments changed or removed]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Yury Norov 2017-08-20 13:20:48 +03:00 committed by Catalin Marinas
parent 5ce93ab624
commit d1be5c99a0
3 changed files with 11 additions and 2 deletions
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2
arch/arm64/include/asm/elf.h
View File

@ -139,7 +139,6 @@ typedef struct user_fpsimd_state elf_fpregset_t;
#define SET_PERSONALITY(ex) \
({ \
current->mm->context.flags = 0; \
clear_thread_flag(TIF_32BIT); \
current->personality &= ~READ_IMPLIES_EXEC; \
})
@ -195,7 +194,6 @@ typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];
*/
#define COMPAT_SET_PERSONALITY(ex) \
({ \
current->mm->context.flags = MMCF_AARCH32; \
set_thread_flag(TIF_32BIT); \
})
#define COMPAT_ARCH_DLINFO

3
arch/arm64/include/asm/thread_info.h
View File

@ -60,6 +60,9 @@ struct thread_info {
#define thread_saved_fp(tsk) \
((unsigned long)(tsk->thread.cpu_context.fp))
void arch_setup_new_exec(void);
#define arch_setup_new_exec arch_setup_new_exec
#endif
/*

8
arch/arm64/kernel/process.c
View File

@ -414,3 +414,11 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
else
return randomize_page(mm->brk, SZ_1G);
}
/*
* Called from setup_new_exec() after (COMPAT_)SET_PERSONALITY.
*/
void arch_setup_new_exec(void)
{
current->mm->context.flags = is_compat_task() ? MMCF_AARCH32 : 0;
}