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arch, mm: Allow arch_dup_mmap() to fail

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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>
This commit is contained in:
Thomas Gleixner 2017-12-14 12:27:29 +01:00 • committed by Ingo Molnar
parent 4831b77940
commit c10e83f598
6 changed files with 14 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
arch/powerpc/include/asm/mmu_context.h
View file

@ -114,9 +114,10 @@ static inline void enter_lazy_tlb(struct mm_struct *mm,
#endif #endif
} }
static inline void arch_dup_mmap(struct mm_struct *oldmm, static inline int arch_dup_mmap(struct mm_struct *oldmm,
struct mm_struct *mm) struct mm_struct *mm)
{ {
return 0;
} }
static inline void arch_exit_mmap(struct mm_struct *mm) static inline void arch_exit_mmap(struct mm_struct *mm)

3
arch/um/include/asm/mmu_context.h
View file

@ -15,9 +15,10 @@ extern void uml_setup_stubs(struct mm_struct *mm);
/* /*
* Needed since we do not use the asm-generic/mm_hooks.h: * Needed since we do not use the asm-generic/mm_hooks.h:
*/ */
static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
{ {
uml_setup_stubs(mm); uml_setup_stubs(mm);
return 0;
} }
extern void arch_exit_mmap(struct mm_struct *mm); extern void arch_exit_mmap(struct mm_struct *mm);
static inline void arch_unmap(struct mm_struct *mm, static inline void arch_unmap(struct mm_struct *mm,

5
arch/unicore32/include/asm/mmu_context.h
View file

@ -81,9 +81,10 @@ do { \
} \ } \
} while (0) } while (0)
static inline void arch_dup_mmap(struct mm_struct *oldmm, static inline int arch_dup_mmap(struct mm_struct *oldmm,
struct mm_struct *mm) struct mm_struct *mm)
{ {
return 0;
} }
static inline void arch_unmap(struct mm_struct *mm, static inline void arch_unmap(struct mm_struct *mm,

4
arch/x86/include/asm/mmu_context.h
View file

@ -176,10 +176,10 @@ do { \
} while (0) } while (0)
#endif #endif
static inline void arch_dup_mmap(struct mm_struct *oldmm, static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
struct mm_struct *mm)
{ {
paravirt_arch_dup_mmap(oldmm, mm); paravirt_arch_dup_mmap(oldmm, mm);
return 0;
} }
static inline void arch_exit_mmap(struct mm_struct *mm) static inline void arch_exit_mmap(struct mm_struct *mm)

5
include/asm-generic/mm_hooks.h
View file

@ -7,9 +7,10 @@
#ifndef _ASM_GENERIC_MM_HOOKS_H #ifndef _ASM_GENERIC_MM_HOOKS_H
#define _ASM_GENERIC_MM_HOOKS_H #define _ASM_GENERIC_MM_HOOKS_H
static inline void arch_dup_mmap(struct mm_struct *oldmm, static inline int arch_dup_mmap(struct mm_struct *oldmm,
struct mm_struct *mm) struct mm_struct *mm)
{ {
return 0;
} }
static inline void arch_exit_mmap(struct mm_struct *mm) static inline void arch_exit_mmap(struct mm_struct *mm)

3
kernel/fork.c
View file

@ -721,8 +721,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
goto out; goto out;
} }
/* a new mm has just been created */ /* a new mm has just been created */
arch_dup_mmap(oldmm, mm); retval = arch_dup_mmap(oldmm, mm);
retval = 0;
out: out:
up_write(&mm->mmap_sem); up_write(&mm->mmap_sem);
flush_tlb_mm(oldmm); flush_tlb_mm(oldmm);