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linux
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vdso.c
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Michel Lespinasse
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Linus Torvalds
mmap locking API: use coccinelle to convert mmap_sem rwsem call sites
Jun 9, 2020
d8ed45c
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Jun 9, 2020
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86 lines (67 loc) · 1.63 KB
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linux
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// SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <linux/kernel.h> #include <linux/err.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/init.h> #include <linux/binfmts.h> #include <linux/elf.h> #include <linux/vmalloc.h> #include <linux/unistd.h> #include <linux/uaccess.h> #include <asm/vdso.h> #include <asm/cacheflush.h> static struct page *vdso_page; static int __init init_vdso(void) { struct csky_vdso *vdso; int err = 0; vdso_page = alloc_page(GFP_KERNEL); if (!vdso_page) panic("Cannot allocate vdso"); vdso = vmap(&vdso_page, 1, 0, PAGE_KERNEL); if (!vdso) panic("Cannot map vdso"); clear_page(vdso); err = setup_vdso_page(vdso->rt_signal_retcode); if (err) panic("Cannot set signal return code, err: %x.", err); dcache_wb_range((unsigned long)vdso, (unsigned long)vdso + 16); vunmap(vdso); return 0; } subsys_initcall(init_vdso); int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) { int ret; unsigned long addr; struct mm_struct *mm = current->mm; mmap_write_lock(mm); addr = get_unmapped_area(NULL, STACK_TOP, PAGE_SIZE, 0, 0); if (IS_ERR_VALUE(addr)) { ret = addr; goto up_fail; } ret = install_special_mapping( mm, addr, PAGE_SIZE, VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, &vdso_page); if (ret) goto up_fail; mm->context.vdso = (void *)addr; up_fail: mmap_write_unlock(mm); return ret; } const char *arch_vma_name(struct vm_area_struct *vma) { if (vma->vm_mm == NULL) return NULL; if (vma->vm_start == (long)vma->vm_mm->context.vdso) return "[vdso]"; else return NULL; }
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