x86 vDSO: consolidate vdso32
This makes x86_64's ia32 emulation support share the sources used in the 32-bit kernel for the 32-bit vDSO and much of its setup code. The 32-bit vDSO mapping now behaves the same on x86_64 as on native 32-bit. The abi.syscall32 sysctl on x86_64 now takes the same values that vm.vdso_enabled takes on the 32-bit kernel. That is, 1 means a randomized vDSO location, 2 means the fixed old address. The CONFIG_COMPAT_VDSO option is now available to make this the default setting, the same meaning it has for the 32-bit kernel. (This does not affect the 64-bit vDSO.) The argument vdso32=[012] can be used on both 32-bit and 64-bit kernels to set this paramter at boot time. The vdso=[012] argument still does this same thing on the 32-bit kernel. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Roland McGrath
Ingo Molnar
Родитель
00f8b1bc0e
Коммит
af65d64845
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@ -1988,6 +1988,11 @@ and is between 256 and 4096 characters. It is defined in the file
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vdso=1: enable VDSO (default)
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vdso=0: disable VDSO mapping
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vdso32= [X86-32,X86-64]
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vdso32=2: enable compat VDSO (default with COMPAT_VDSO)
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vdso32=1: enable 32-bit VDSO (default)
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vdso32=0: disable 32-bit VDSO mapping
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vector= [IA-64,SMP]
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vector=percpu: enable percpu vector domain
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@ -1191,9 +1191,9 @@ config HOTPLUG_CPU
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config COMPAT_VDSO
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bool "Compat VDSO support"
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default y
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depends on X86_32
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depends on X86_32 || IA32_EMULATION
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help
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Map the VDSO to the predictable old-style address too.
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Map the 32-bit VDSO to the predictable old-style address too.
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---help---
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Say N here if you are running a sufficiently recent glibc
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version (2.3.3 or later), to remove the high-mapped
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@ -3,7 +3,7 @@
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#
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obj-$(CONFIG_IA32_EMULATION) := ia32entry.o sys_ia32.o ia32_signal.o tls32.o \
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ia32_binfmt.o fpu32.o ptrace32.o syscall32.o syscall32_syscall.o
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ia32_binfmt.o fpu32.o ptrace32.o
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sysv-$(CONFIG_SYSVIPC) := ipc32.o
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obj-$(CONFIG_IA32_EMULATION) += $(sysv-y)
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@ -26,7 +26,7 @@
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#include <asm/i387.h>
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#include <asm/uaccess.h>
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#include <asm/ia32.h>
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#include <asm/vsyscall32.h>
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#include <asm/vdso.h>
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#undef ELF_ARCH
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#undef ELF_CLASS
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@ -47,14 +47,13 @@
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#define AT_SYSINFO 32
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#define AT_SYSINFO_EHDR 33
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int sysctl_vsyscall32 = 1;
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extern int sysctl_vsyscall32;
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#undef ARCH_DLINFO
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#define ARCH_DLINFO do { \
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if (sysctl_vsyscall32) { \
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current->mm->context.vdso = (void *)VSYSCALL32_BASE; \
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NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \
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NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE); \
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NEW_AUX_ENT(AT_SYSINFO, (u32)VDSO_ENTRY); \
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NEW_AUX_ENT(AT_SYSINFO_EHDR, (u32)VDSO_CURRENT_BASE); \
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} \
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} while(0)
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@ -31,7 +31,7 @@
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#include <asm/sigcontext32.h>
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#include <asm/fpu32.h>
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#include <asm/proto.h>
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#include <asm/vsyscall32.h>
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#include <asm/vdso.h>
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#define DEBUG_SIG 0
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@ -465,13 +465,16 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
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goto give_sigsegv;
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}
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/* Return stub is in 32bit vsyscall page */
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if (current->binfmt->hasvdso)
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restorer = VSYSCALL32_SIGRETURN;
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else
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restorer = (void *)&frame->retcode;
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if (ka->sa.sa_flags & SA_RESTORER)
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if (ka->sa.sa_flags & SA_RESTORER) {
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restorer = ka->sa.sa_restorer;
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} else {
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/* Return stub is in 32bit vsyscall page */
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if (current->binfmt->hasvdso)
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restorer = VDSO32_SYMBOL(current->mm->context.vdso,
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sigreturn);
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else
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restorer = (void *)&frame->retcode;
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}
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err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
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/*
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@ -519,7 +522,7 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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{
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struct rt_sigframe __user *frame;
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struct exec_domain *ed = current_thread_info()->exec_domain;
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void __user *restorer = VSYSCALL32_RTSIGRETURN;
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void __user *restorer;
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int err = 0;
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/* __copy_to_user optimizes that into a single 8 byte store */
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@ -564,6 +567,9 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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if (ka->sa.sa_flags & SA_RESTORER)
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restorer = ka->sa.sa_restorer;
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else
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restorer = VDSO32_SYMBOL(current->mm->context.vdso,
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rt_sigreturn);
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err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
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/*
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@ -15,7 +15,7 @@ vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o vvar.o
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# files to link into kernel
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obj-$(VDSO64-y) += vma.o vdso.o
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obj-$(CONFIG_X86_32) += vdso32.o vdso32-setup.o
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obj-$(VDSO32-y) += vdso32.o vdso32-setup.o
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vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
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@ -24,6 +24,7 @@
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#include <asm/elf.h>
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#include <asm/tlbflush.h>
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#include <asm/vdso.h>
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#include <asm/proto.h>
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enum {
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VDSO_DISABLED = 0,
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@ -37,14 +38,24 @@ enum {
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#define VDSO_DEFAULT VDSO_ENABLED
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#endif
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#ifdef CONFIG_X86_64
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#define vdso_enabled sysctl_vsyscall32
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#define arch_setup_additional_pages syscall32_setup_pages
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#endif
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/*
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* This is the difference between the prelinked addresses in the vDSO images
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* and the VDSO_HIGH_BASE address where CONFIG_COMPAT_VDSO places the vDSO
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* in the user address space.
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*/
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#define VDSO_ADDR_ADJUST (VDSO_HIGH_BASE - (unsigned long)VDSO32_PRELINK)
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/*
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* Should the kernel map a VDSO page into processes and pass its
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* address down to glibc upon exec()?
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*/
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unsigned int __read_mostly vdso_enabled = VDSO_DEFAULT;
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EXPORT_SYMBOL_GPL(vdso_enabled);
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static int __init vdso_setup(char *s)
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{
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vdso_enabled = simple_strtoul(s, NULL, 0);
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@ -52,9 +63,18 @@ static int __init vdso_setup(char *s)
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return 1;
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}
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__setup("vdso=", vdso_setup);
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/*
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* For consistency, the argument vdso32=[012] affects the 32-bit vDSO
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* behavior on both 64-bit and 32-bit kernels.
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* On 32-bit kernels, vdso=[012] means the same thing.
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*/
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__setup("vdso32=", vdso_setup);
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extern asmlinkage void ia32_sysenter_target(void);
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#ifdef CONFIG_X86_32
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__setup_param("vdso=", vdso32_setup, vdso_setup, 0);
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EXPORT_SYMBOL_GPL(vdso_enabled);
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#endif
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static __init void reloc_symtab(Elf32_Ehdr *ehdr,
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unsigned offset, unsigned size)
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@ -79,7 +99,7 @@ static __init void reloc_symtab(Elf32_Ehdr *ehdr,
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case STT_FUNC:
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case STT_SECTION:
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case STT_FILE:
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sym->st_value += VDSO_HIGH_BASE;
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sym->st_value += VDSO_ADDR_ADJUST;
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}
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}
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}
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@ -105,7 +125,7 @@ static __init void reloc_dyn(Elf32_Ehdr *ehdr, unsigned offset)
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case DT_VERNEED:
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case DT_ADDRRNGLO ... DT_ADDRRNGHI:
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/* definitely pointers needing relocation */
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dyn->d_un.d_ptr += VDSO_HIGH_BASE;
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dyn->d_un.d_ptr += VDSO_ADDR_ADJUST;
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break;
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case DT_ENCODING ... OLD_DT_LOOS-1:
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@ -114,7 +134,7 @@ static __init void reloc_dyn(Elf32_Ehdr *ehdr, unsigned offset)
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they're even */
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if (dyn->d_tag >= DT_ENCODING &&
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(dyn->d_tag & 1) == 0)
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dyn->d_un.d_ptr += VDSO_HIGH_BASE;
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dyn->d_un.d_ptr += VDSO_ADDR_ADJUST;
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break;
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case DT_VERDEFNUM:
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@ -143,15 +163,15 @@ static __init void relocate_vdso(Elf32_Ehdr *ehdr)
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int i;
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BUG_ON(memcmp(ehdr->e_ident, ELFMAG, 4) != 0 ||
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!elf_check_arch(ehdr) ||
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!elf_check_arch_ia32(ehdr) ||
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ehdr->e_type != ET_DYN);
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ehdr->e_entry += VDSO_HIGH_BASE;
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ehdr->e_entry += VDSO_ADDR_ADJUST;
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/* rebase phdrs */
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phdr = (void *)ehdr + ehdr->e_phoff;
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for (i = 0; i < ehdr->e_phnum; i++) {
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phdr[i].p_vaddr += VDSO_HIGH_BASE;
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phdr[i].p_vaddr += VDSO_ADDR_ADJUST;
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/* relocate dynamic stuff */
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if (phdr[i].p_type == PT_DYNAMIC)
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@ -164,7 +184,7 @@ static __init void relocate_vdso(Elf32_Ehdr *ehdr)
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if (!(shdr[i].sh_flags & SHF_ALLOC))
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continue;
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shdr[i].sh_addr += VDSO_HIGH_BASE;
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shdr[i].sh_addr += VDSO_ADDR_ADJUST;
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if (shdr[i].sh_type == SHT_SYMTAB ||
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shdr[i].sh_type == SHT_DYNSYM)
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@ -173,6 +193,45 @@ static __init void relocate_vdso(Elf32_Ehdr *ehdr)
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}
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}
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/*
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* These symbols are defined by vdso32.S to mark the bounds
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* of the ELF DSO images included therein.
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*/
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extern const char vdso32_default_start, vdso32_default_end;
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extern const char vdso32_sysenter_start, vdso32_sysenter_end;
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static struct page *vdso32_pages[1];
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#ifdef CONFIG_X86_64
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static int use_sysenter __read_mostly = -1;
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#define vdso32_sysenter() (use_sysenter > 0)
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/* May not be __init: called during resume */
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void syscall32_cpu_init(void)
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{
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if (use_sysenter < 0)
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use_sysenter = (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL);
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/* Load these always in case some future AMD CPU supports
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SYSENTER from compat mode too. */
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checking_wrmsrl(MSR_IA32_SYSENTER_CS, (u64)__KERNEL_CS);
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checking_wrmsrl(MSR_IA32_SYSENTER_ESP, 0ULL);
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checking_wrmsrl(MSR_IA32_SYSENTER_EIP, (u64)ia32_sysenter_target);
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wrmsrl(MSR_CSTAR, ia32_cstar_target);
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}
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#define compat_uses_vma 1
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static inline void map_compat_vdso(int map)
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{
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}
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#else /* CONFIG_X86_32 */
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#define vdso32_sysenter() (boot_cpu_has(X86_FEATURE_SEP))
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void enable_sep_cpu(void)
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{
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int cpu = get_cpu();
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@ -210,13 +269,7 @@ static int __init gate_vma_init(void)
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return 0;
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}
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/*
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* These symbols are defined by vsyscall.o to mark the bounds
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* of the ELF DSO images included therein.
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*/
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extern const char vsyscall_int80_start, vsyscall_int80_end;
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extern const char vsyscall_sysenter_start, vsyscall_sysenter_end;
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static struct page *syscall_pages[1];
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#define compat_uses_vma 0
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static void map_compat_vdso(int map)
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{
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@ -227,31 +280,35 @@ static void map_compat_vdso(int map)
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vdso_mapped = map;
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__set_fixmap(FIX_VDSO, page_to_pfn(syscall_pages[0]) << PAGE_SHIFT,
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__set_fixmap(FIX_VDSO, page_to_pfn(vdso32_pages[0]) << PAGE_SHIFT,
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map ? PAGE_READONLY_EXEC : PAGE_NONE);
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/* flush stray tlbs */
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flush_tlb_all();
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}
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#endif /* CONFIG_X86_64 */
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int __init sysenter_setup(void)
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{
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void *syscall_page = (void *)get_zeroed_page(GFP_ATOMIC);
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const void *vsyscall;
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size_t vsyscall_len;
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syscall_pages[0] = virt_to_page(syscall_page);
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vdso32_pages[0] = virt_to_page(syscall_page);
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#ifdef CONFIG_X86_32
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gate_vma_init();
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printk("Compat vDSO mapped to %08lx.\n", __fix_to_virt(FIX_VDSO));
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#endif
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if (!boot_cpu_has(X86_FEATURE_SEP)) {
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vsyscall = &vsyscall_int80_start;
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vsyscall_len = &vsyscall_int80_end - &vsyscall_int80_start;
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if (!vdso32_sysenter()) {
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vsyscall = &vdso32_default_start;
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vsyscall_len = &vdso32_default_end - &vdso32_default_start;
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} else {
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vsyscall = &vsyscall_sysenter_start;
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vsyscall_len = &vsyscall_sysenter_end - &vsyscall_sysenter_start;
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vsyscall = &vdso32_sysenter_start;
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vsyscall_len = &vdso32_sysenter_end - &vdso32_sysenter_start;
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}
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memcpy(syscall_page, vsyscall, vsyscall_len);
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@ -284,7 +341,9 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int exstack)
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ret = addr;
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goto up_fail;
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}
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}
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if (compat_uses_vma || !compat) {
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/*
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* MAYWRITE to allow gdb to COW and set breakpoints
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*
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@ -298,7 +357,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int exstack)
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VM_READ|VM_EXEC|
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VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
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VM_ALWAYSDUMP,
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syscall_pages);
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vdso32_pages);
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if (ret)
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goto up_fail;
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@ -314,6 +373,12 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int exstack)
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return ret;
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}
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#ifdef CONFIG_X86_64
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__initcall(sysenter_setup);
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#else /* CONFIG_X86_32 */
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const char *arch_vma_name(struct vm_area_struct *vma)
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{
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if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
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|
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@ -342,3 +407,5 @@ int in_gate_area_no_task(unsigned long addr)
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{
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return 0;
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}
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#endif /* CONFIG_X86_64 */
|
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|
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|
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|
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@ -2,14 +2,18 @@
|
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|
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__INITDATA
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|
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.globl vsyscall_int80_start, vsyscall_int80_end
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vsyscall_int80_start:
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.globl vdso32_default_start, vdso32_default_end
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vdso32_default_start:
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#ifdef CONFIG_X86_32
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.incbin "arch/x86/vdso/vdso32-int80.so"
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vsyscall_int80_end:
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#else
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.incbin "arch/x86/vdso/vdso32-syscall.so"
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#endif
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vdso32_default_end:
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|
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.globl vsyscall_sysenter_start, vsyscall_sysenter_end
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vsyscall_sysenter_start:
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.globl vdso32_sysenter_start, vdso32_sysenter_end
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vdso32_sysenter_start:
|
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.incbin "arch/x86/vdso/vdso32-sysenter.so"
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vsyscall_sysenter_end:
|
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vdso32_sysenter_end:
|
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|
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__FINIT
|
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|
|
|
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|
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@ -62,8 +62,8 @@ static void xen_idle(void)
|
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*/
|
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static void fiddle_vdso(void)
|
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{
|
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extern char vsyscall_int80_start;
|
||||
u32 *mask = VDSO32_SYMBOL(&vsyscall_int80_start, NOTE_MASK);
|
||||
extern const char vdso32_default_start;
|
||||
u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
|
||||
*mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -74,17 +74,19 @@ typedef struct user_fxsr_struct elf_fpxregset_t;
|
|||
|
||||
#ifdef __KERNEL__
|
||||
|
||||
/*
|
||||
* This is used to ensure we don't load something for the wrong architecture.
|
||||
*/
|
||||
#define elf_check_arch_ia32(x) \
|
||||
(((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
#include <asm/processor.h>
|
||||
#include <asm/system.h> /* for savesegment */
|
||||
#include <asm/desc.h>
|
||||
#include <asm/vdso.h>
|
||||
|
||||
/*
|
||||
* This is used to ensure we don't load something for the wrong architecture.
|
||||
*/
|
||||
#define elf_check_arch(x) \
|
||||
(((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
|
||||
#define elf_check_arch(x) elf_check_arch_ia32(x)
|
||||
|
||||
/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
|
||||
contains a pointer to a function which might be registered using `atexit'.
|
||||
|
|
@ -247,10 +249,6 @@ extern int dump_task_extended_fpu (struct task_struct *,
|
|||
#define ELF_CORE_XFPREG_TYPE NT_PRXFPREG
|
||||
|
||||
#define VDSO_HIGH_BASE (__fix_to_virt(FIX_VDSO))
|
||||
#define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso)
|
||||
|
||||
#define VDSO_ENTRY \
|
||||
((unsigned long) VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall))
|
||||
|
||||
/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
|
||||
|
||||
|
|
@ -262,6 +260,8 @@ do if (vdso_enabled) { \
|
|||
|
||||
#else /* CONFIG_X86_32 */
|
||||
|
||||
#define VDSO_HIGH_BASE 0xffffe000U /* CONFIG_COMPAT_VDSO address */
|
||||
|
||||
/* 1GB for 64bit, 8MB for 32bit */
|
||||
#define STACK_RND_MASK (test_thread_flag(TIF_IA32) ? 0x7ff : 0x3fffff)
|
||||
|
||||
|
|
@ -272,6 +272,11 @@ do if (vdso_enabled) { \
|
|||
|
||||
#endif /* !CONFIG_X86_32 */
|
||||
|
||||
#define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso)
|
||||
|
||||
#define VDSO_ENTRY \
|
||||
((unsigned long) VDSO32_SYMBOL(VDSO_CURRENT_BASE, vsyscall))
|
||||
|
||||
struct linux_binprm;
|
||||
|
||||
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
|
||||
|
|
|
|||
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