497258dfaf
All relevant architectures had already been converted to the new interface (which just has an underscore in front of the name - not very imaginative naming), this just force-converts the stragglers. The modern interface is almost identical to the old one, except instead of the page pointer it takes a "struct vm_special_mapping" that describes the mapping (and contains the page pointer as one member), and it returns the resulting 'vma' instead of just the error code. Getting rid of the old interface also gets rid of some special casing, which had caused problems with the mremap extensions to "struct vm_special_mapping". [akpm@linux-foundation.org: coding-style cleanups] Link: https://lkml.kernel.org/r/CAHk-=whvR+z=0=0gzgdfUiK70JTa-=+9vxD-4T=3BagXR6dciA@mail.gmail.comTested-by: Rob Landley <rob@landley.net> # arch/sh/ Link: https://lore.kernel.org/all/20240819195120.GA1113263@thelio-3990X/ Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Brian Cain <bcain@quicinc.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Guo Ren <guoren@kernel.org> Cc: Jeff Xu <jeffxu@google.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Pedro Falcato <pedro.falcato@gmail.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Rob Landley <rob@landley.net> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
77 lines
1.4 KiB
C
77 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
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*/
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <asm/page.h>
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#include <asm/elf.h>
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#include <linux/init.h>
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static unsigned int __read_mostly vdso_enabled = 1;
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unsigned long um_vdso_addr;
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extern unsigned long task_size;
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extern char vdso_start[], vdso_end[];
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static struct page **vdsop;
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static int __init init_vdso(void)
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{
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struct page *um_vdso;
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BUG_ON(vdso_end - vdso_start > PAGE_SIZE);
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um_vdso_addr = task_size - PAGE_SIZE;
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vdsop = kmalloc(sizeof(struct page *), GFP_KERNEL);
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if (!vdsop)
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goto oom;
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um_vdso = alloc_page(GFP_KERNEL);
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if (!um_vdso) {
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kfree(vdsop);
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goto oom;
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}
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copy_page(page_address(um_vdso), vdso_start);
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*vdsop = um_vdso;
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return 0;
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oom:
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printk(KERN_ERR "Cannot allocate vdso\n");
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vdso_enabled = 0;
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return -ENOMEM;
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}
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subsys_initcall(init_vdso);
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int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
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{
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struct vm_area_struct *vma;
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struct mm_struct *mm = current->mm;
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static struct vm_special_mapping vdso_mapping = {
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.name = "[vdso]",
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};
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if (!vdso_enabled)
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return 0;
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if (mmap_write_lock_killable(mm))
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return -EINTR;
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vdso_mapping.pages = vdsop;
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vma = _install_special_mapping(mm, um_vdso_addr, PAGE_SIZE,
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VM_READ|VM_EXEC|
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VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
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&vdso_mapping);
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mmap_write_unlock(mm);
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return IS_ERR(vma) ? PTR_ERR(vma) : 0;
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}
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