arch, mm: Allow arch_dup_mmap() to fail
In order to sanitize the LDT initialization on x86 arch_dup_mmap() must be allowed to fail. Fix up all instances. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirsky <luto@kernel.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bpetkov@suse.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Laight <David.Laight@aculab.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Eduardo Valentin <eduval@amazon.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will.deacon@arm.com> Cc: aliguori@amazon.com Cc: dan.j.williams@intel.com Cc: hughd@google.com Cc: keescook@google.com Cc: kirill.shutemov@linux.intel.com Cc: linux-mm@kvack.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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4831b77940
Коммит
c10e83f598
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@ -114,9 +114,10 @@ static inline void enter_lazy_tlb(struct mm_struct *mm,
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#endif
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}
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static inline void arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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static inline int arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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{
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return 0;
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}
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static inline void arch_exit_mmap(struct mm_struct *mm)
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@ -15,9 +15,10 @@ extern void uml_setup_stubs(struct mm_struct *mm);
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/*
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* Needed since we do not use the asm-generic/mm_hooks.h:
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*/
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static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
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static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
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{
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uml_setup_stubs(mm);
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return 0;
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}
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extern void arch_exit_mmap(struct mm_struct *mm);
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static inline void arch_unmap(struct mm_struct *mm,
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@ -81,9 +81,10 @@ do { \
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} \
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} while (0)
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static inline void arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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static inline int arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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{
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return 0;
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}
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static inline void arch_unmap(struct mm_struct *mm,
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@ -176,10 +176,10 @@ do { \
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} while (0)
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#endif
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static inline void arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
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{
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paravirt_arch_dup_mmap(oldmm, mm);
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return 0;
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}
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static inline void arch_exit_mmap(struct mm_struct *mm)
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@ -7,9 +7,10 @@
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#ifndef _ASM_GENERIC_MM_HOOKS_H
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#define _ASM_GENERIC_MM_HOOKS_H
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static inline void arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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static inline int arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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{
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return 0;
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}
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static inline void arch_exit_mmap(struct mm_struct *mm)
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@ -721,8 +721,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
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goto out;
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}
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/* a new mm has just been created */
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arch_dup_mmap(oldmm, mm);
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retval = 0;
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retval = arch_dup_mmap(oldmm, mm);
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out:
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up_write(&mm->mmap_sem);
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flush_tlb_mm(oldmm);
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