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authorThomas Gleixner <tglx@linutronix.de>2017-12-14 12:27:29 +0100
committerIngo Molnar <mingo@kernel.org>2017-12-22 20:13:01 +0100
commitc10e83f598d08046dd1ebc8360d4bb12d802d51b (patch)
treeb1b8d341aefdd1869b07c33193499eb9019c09db /kernel
parentx86/vsyscall/64: Warn and fail vsyscall emulation in NATIVE mode (diff)
downloadlinux-c10e83f598d08046dd1ebc8360d4bb12d802d51b.tar.xz
linux-c10e83f598d08046dd1ebc8360d4bb12d802d51b.zip
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 07cc743698d3..500ce64517d9 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -721,8 +721,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
goto out;
}
/* a new mm has just been created */
- arch_dup_mmap(oldmm, mm);
- retval = 0;
+ retval = arch_dup_mmap(oldmm, mm);
out:
up_write(&mm->mmap_sem);
flush_tlb_mm(oldmm);