Attachment 148544 Details for Bug 229304 – linux-2.6-x86-vdso-place.patch

[patch] linux-2.6-x86-vdso-place.patch

linux-2.6-x86-vdso-stacktop-0.patch (text/plain), 1.25 KB, created by John Reiser on 2007-02-21 22:13:33 UTC

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Creator: John Reiser

Created: 2007-02-21 22:13:33 UTC

Size: 1.25 KB

patch

obsolete

>--- ./arch/i386/kernel/sysenter.c.orig	2007-02-21 11:07:18.000000000 -0800
>+++ ./arch/i386/kernel/sysenter.c	2007-02-21 11:24:19.000000000 -0800
>@@ -106,11 +106,38 @@
> 				unsigned long start_code, unsigned long interp_map_address)
> {
> 	struct mm_struct *mm = current->mm;
>-	unsigned long addr;
>-	int ret;
>-
>+ 	unsigned long addr = 0ul;
>+ 	unsigned long flags = 0ul;
>+	int ret = 0;
>+ 
>+	switch (vdso_enabled) {
>+	case 0: /* no vdso at all */
>+		return ret;
>+	case 1: /* random vdso */
>+		break;
>+	case 2: /* vdso at STACK_TOP */
>+		addr = STACK_TOP;
>+		flags = MAP_FIXED;
>+		break;
>+
>+	/* 0x111000: 1MB for vm86 mode, 64KB for DOS himem, 4KB for vdso */
>+	case 3: /* vdso just below .text of main, unless too low */
>+		if (0x111000<=start_code)
>+			addr = start_code - PAGE_SIZE;
>+		else
>+			addr = STACK_TOP;
>+		flags = MAP_FIXED;
>+		break;
>+	case 4: /* vdso just below .text of PT_INTERP, unless too low */
>+		if (0x111000<=interp_map_address)
>+			addr = interp_map_address - PAGE_SIZE;
>+		else
>+			addr = STACK_TOP;
>+		flags = MAP_FIXED;
>+		break;
>+	}
> 	down_write(&mm->mmap_sem);
>-	addr = get_unmapped_area_prot(NULL, 0, PAGE_SIZE, 0, 0, 1);
>+	addr = get_unmapped_area_prot(NULL, addr, PAGE_SIZE, 0, flags, 1);
> 	if (IS_ERR_VALUE(addr)) {
> 		ret = addr;
> 		goto up_fail;

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Attachments on bug 229304: 148397 | 148544