linux-hardening - [PATCH v4 6/6] mm: Remove unused vm

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Message-Id: <20230929032435.2391507-6-keescook@chromium.org>
Date: Thu, 28 Sep 2023 20:24:34 -0700
From: Kees Cook <keescook@...omium.org>
To: Eric Biederman <ebiederm@...ssion.com>
Cc: Kees Cook <keescook@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org,
	Sebastian Ott <sebott@...hat.com>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	Pedro Falcato <pedro.falcato@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH v4 6/6] mm: Remove unused vm_brk()

With fs/binfmt_elf.c fully refactored to use the new elf_load() helper,
there are no more users of vm_brk(), so remove it.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Suggested-by: Eric Biederman <ebiederm@...ssion.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 include/linux/mm.h | 3 +--
 mm/mmap.c          | 6 ------
 mm/nommu.c         | 5 -----
 3 files changed, 1 insertion(+), 13 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index bf5d0b1b16f4..216dd0c6dcf8 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3308,8 +3308,7 @@ static inline void mm_populate(unsigned long addr, unsigned long len)
 static inline void mm_populate(unsigned long addr, unsigned long len) {}
 #endif
 
-/* These take the mm semaphore themselves */
-extern int __must_check vm_brk(unsigned long, unsigned long);
+/* This takes the mm semaphore itself */
 extern int __must_check vm_brk_flags(unsigned long, unsigned long, unsigned long);
 extern int vm_munmap(unsigned long, size_t);
 extern unsigned long __must_check vm_mmap(struct file *, unsigned long,
diff --git a/mm/mmap.c b/mm/mmap.c
index b56a7f0c9f85..34d2337ace59 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3174,12 +3174,6 @@ int vm_brk_flags(unsigned long addr, unsigned long request, unsigned long flags)
 }
 EXPORT_SYMBOL(vm_brk_flags);
 
-int vm_brk(unsigned long addr, unsigned long len)
-{
-	return vm_brk_flags(addr, len, 0);
-}
-EXPORT_SYMBOL(vm_brk);
-
 /* Release all mmaps. */
 void exit_mmap(struct mm_struct *mm)
 {
diff --git a/mm/nommu.c b/mm/nommu.c
index 7f9e9e5a0e12..23c43c208f2b 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1531,11 +1531,6 @@ void exit_mmap(struct mm_struct *mm)
 	mmap_write_unlock(mm);
 }
 
-int vm_brk(unsigned long addr, unsigned long len)
-{
-	return -ENOMEM;
-}
-
 /*
  * expand (or shrink) an existing mapping, potentially moving it at the same
  * time (controlled by the MREMAP_MAYMOVE flag and available VM space)
-- 
2.34.1