5059ab35f3
git-svn-id: https://svn.disconnected-by-peer.at/svn/linamh/trunk/linamh@1552 6952d904-891a-0410-993b-d76249ca496b
61 lines
2.5 KiB
Diff
61 lines
2.5 KiB
Diff
diff -Nru glibc-2.3.3.old/sysdeps/unix/sysv/linux/dl-sysdep.c glibc-2.3.3/sysdeps/unix/sysv/linux/dl-sysdep.c
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--- glibc-2.3.3.old/sysdeps/unix/sysv/linux/dl-sysdep.c 2004-08-16 10:47:10.361264216 -0400
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+++ glibc-2.3.3/sysdeps/unix/sysv/linux/dl-sysdep.c 2004-08-16 10:47:55.068467688 -0400
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@@ -1,5 +1,5 @@
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/* Dynamic linker system dependencies for Linux.
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- Copyright (C) 1995, 1997, 2001 Free Software Foundation, Inc.
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+ Copyright (C) 1995, 1997, 2001, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@@ -21,6 +21,8 @@
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the generic dynamic linker system interface code. */
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#include <unistd.h>
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+#include <ldsodefs.h>
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+#include "kernel-features.h"
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#define DL_SYSDEP_INIT frob_brk ()
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@@ -28,6 +30,27 @@
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frob_brk (void)
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{
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__brk (0); /* Initialize the break. */
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+
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+#if ! __ASSUME_BRK_PAGE_ROUNDED
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+ /* If the dynamic linker was executed as a program, then the break may
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+ start immediately after our data segment. However, dl-minimal.c has
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+ already stolen the remainder of the page for internal allocations.
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+ If we don't adjust the break location recorded by the kernel, the
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+ normal program startup will inquire, find the value at our &_end,
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+ and start allocating its own data there, clobbering dynamic linker
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+ data structures allocated there during startup.
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+
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+ Later Linux kernels have changed this behavior so that the initial
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+ break value is rounded up to the page boundary before we start. */
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+
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+ extern void *__curbrk attribute_hidden;
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+ extern void _end attribute_hidden;
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+ void *const endpage = (void *) 0 + (((__curbrk - (void *) 0)
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+ + GLRO(dl_pagesize) - 1)
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+ & -GLRO(dl_pagesize));
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+ if (__builtin_expect (__curbrk >= &_end && __curbrk < endpage, 0))
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+ __brk (endpage);
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+#endif
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}
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#include <sysdeps/generic/dl-sysdep.c>
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diff -Nru glibc-2.3.3.old/sysdeps/unix/sysv/linux/kernel-features.h glibc-2.3.3/sysdeps/unix/sysv/linux/kernel-features.h
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--- glibc-2.3.3.old/sysdeps/unix/sysv/linux/kernel-features.h 2004-08-16 10:47:09.458401472 -0400
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+++ glibc-2.3.3/sysdeps/unix/sysv/linux/kernel-features.h 2004-08-16 10:48:02.345361432 -0400
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@@ -400,3 +400,9 @@
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#if __LINUX_KERNEL_VERSION >= 132612
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# define __ASSUME_GETDENTS32_D_TYPE 1
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#endif
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+
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+/* Starting with version 2.5.3, the initial location returned by `brk'
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+ after exec is always rounded up to the next page. */
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+#if __LINUX_KERNEL_VERSION >= 132355
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+# define __ASSUME_BRK_PAGE_ROUNDED 1
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+#endif
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