From nobody Sat Apr 4 04:48:20 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E311A3F211A; Fri, 20 Mar 2026 19:39:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774035548; cv=none; b=kRX68NPPeCxwmBqJNJPDGvAw3JJBUgUfCFbj8vKsSc2MZ4mBHzdQIt/qfaLBuClXhQMtCKcMzir8GQVXNkK8l5tveAZ00tIgKHHoi2YwcWaZBKA4LjyIfKyqAuSk0pGEkeupNbvVvTZuxdKgc12Fbv4+50bY7GL22ldC1Gy5Se8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774035548; c=relaxed/simple; bh=86x1e2KlqpteSaaM7lejP1Bl+dRpcwhLokvktrA9jqY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sZqvrMPl6KEQ3cwPeV+PwScV/rCS31TO+7LJ+3s/70iVKZkD+VFW3p29inrnORrDt3p2PYJXZez2Yu02aVGZjB0isHV4AHSDcV5UboGkp8YNkc2oY6ay7u7r8yndZ0CX0j3tcBelPflp0xm5ZeEHaoDZ1YAD5PDYryy5+WsVeGs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Uhu53cZC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Uhu53cZC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0929DC2BCB0; Fri, 20 Mar 2026 19:39:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774035547; bh=86x1e2KlqpteSaaM7lejP1Bl+dRpcwhLokvktrA9jqY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Uhu53cZC/i9jnIgNtZl9DHyCJPNP7M2+7D0KPd9H0fOR7q4bemzt8shuQyEUWwhgw 1ceG+HynjH/FwHZBb0jwxNV8M1Q8u6YMdqWyVhbOh8oWKDv5uQ4TGn6HzZegbrrAqH 4TZ1iaZ6kqLTGCKwcLPz/ya6pD3aVyEPJTuAeq1ihituF+qqu/HxmZnuwCKmTMcuKw 7SqEgTRKI6Q9dEnoOjZp4wk31l0zJ8YG/iHBXji2ff9HJpgBY20Q6q9JQccuLxQsOQ hGqeIqAOlGLcNYOfBJ7exBVzVbmnejqpV+UXJ5zxhlED6Nvu0YgE/UA8CGIIK7x8cD +7qbaWZY4pG/g== From: "Lorenzo Stoakes (Oracle)" To: Andrew Morton Cc: David Hildenbrand , "Liam R . Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , Mike Rapoport , Suren Baghdasaryan , Kees Cook , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vineet Gupta , Russell King , Catalin Marinas , Will Deacon , Brian Cain , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , Dinh Nguyen , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Richard Weinberger , Anton Ivanov , Johannes Berg , Alexander Viro , Christian Brauner , Jan Kara , Xu Xin , Chengming Zhou , Michal Hocko , Paul Moore , Stephen Smalley , Ondrej Mosnacek , linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-um@lists.infradead.org, linux-fsdevel@vger.kernel.org, selinux@vger.kernel.org Subject: [PATCH v4 09/25] mm: unexport vm_brk_flags() and eliminate vm_flags parameter Date: Fri, 20 Mar 2026 19:38:26 +0000 Message-ID: <7bada48ddf3f9dbd3e6c4fc50ec2f4de97706f52.1774034900.git.ljs@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This function is only used by elf_load(), and that is a static function that doesn't need an exported symbol to invoke an internal function, so un-EXPORT_SYMBOLS() it. Also, the vm_flags parameter is unnecessary, as we only ever set VM_EXEC, so simply make this parameter a boolean. While we're here, clean up the mm.h definitions for the various vm_xxx() helpers so we actually specify parameter names and elide the redundant extern's. Acked-by: Vlastimil Babka (SUSE) Signed-off-by: Lorenzo Stoakes (Oracle) --- fs/binfmt_elf.c | 3 +-- include/linux/mm.h | 12 ++++++------ mm/mmap.c | 8 ++------ 3 files changed, 9 insertions(+), 14 deletions(-) diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index fb857faaf0d6..16a56b6b3f6c 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -453,14 +453,13 @@ static unsigned long elf_load(struct file *filep, uns= igned long addr, zero_end =3D ELF_PAGEALIGN(zero_end); =20 error =3D vm_brk_flags(zero_start, zero_end - zero_start, - prot & PROT_EXEC ? VM_EXEC : 0); + prot & PROT_EXEC); if (error) map_addr =3D error; } return map_addr; } =20 - static unsigned long total_mapping_size(const struct elf_phdr *phdr, int n= r) { elf_addr_t min_addr =3D -1; diff --git a/include/linux/mm.h b/include/linux/mm.h index 0c35423177bf..42d346684678 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4005,12 +4005,12 @@ static inline void mm_populate(unsigned long addr, = unsigned long len) {} #endif =20 /* This takes the mm semaphore itself */ -extern int __must_check vm_brk_flags(unsigned long, unsigned long, unsigne= d long); -extern int vm_munmap(unsigned long, size_t); -extern unsigned long __must_check vm_mmap(struct file *, unsigned long, - unsigned long, unsigned long, - unsigned long, unsigned long); -extern unsigned long __must_check vm_mmap_shadow_stack(unsigned long addr, +int __must_check vm_brk_flags(unsigned long addr, unsigned long request, b= ool is_exec); +int vm_munmap(unsigned long start, size_t len); +unsigned long __must_check vm_mmap(struct file *file, unsigned long addr, + unsigned long len, unsigned long prot, + unsigned long flag, unsigned long offset); +unsigned long __must_check vm_mmap_shadow_stack(unsigned long addr, unsigned long len, unsigned long flags); =20 struct vm_unmapped_area_info { diff --git a/mm/mmap.c b/mm/mmap.c index 79544d893411..2d2b814978bf 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1201,8 +1201,9 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, star= t, unsigned long, size, return ret; } =20 -int vm_brk_flags(unsigned long addr, unsigned long request, vm_flags_t vm_= flags) +int vm_brk_flags(unsigned long addr, unsigned long request, bool is_exec) { + const vm_flags_t vm_flags =3D is_exec ? VM_EXEC : 0; struct mm_struct *mm =3D current->mm; struct vm_area_struct *vma =3D NULL; unsigned long len; @@ -1217,10 +1218,6 @@ int vm_brk_flags(unsigned long addr, unsigned long r= equest, vm_flags_t vm_flags) if (!len) return 0; =20 - /* Until we need other flags, refuse anything except VM_EXEC. */ - if ((vm_flags & (~VM_EXEC)) !=3D 0) - return -EINVAL; - if (mmap_write_lock_killable(mm)) return -EINTR; =20 @@ -1246,7 +1243,6 @@ int vm_brk_flags(unsigned long addr, unsigned long re= quest, vm_flags_t vm_flags) mmap_write_unlock(mm); return ret; } -EXPORT_SYMBOL(vm_brk_flags); =20 static unsigned long tear_down_vmas(struct mm_struct *mm, struct vma_iterator *vm= i, --=20 2.53.0