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linux/arch/x86_64/ia32/ia32_binfmt.c
Andi Kleen df818a52fb [PATCH] x86_64: Fix 32bit thread coredumps 
When a register set is passed in don't try to fix up the pointer.

Noticed by Al Viro

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-12-12 22:31:16 -08:00

432 lines
12 KiB
C
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/*
* Written 2000,2002 by Andi Kleen.
*
* Loosely based on the sparc64 and IA64 32bit emulation loaders.
* This tricks binfmt_elf.c into loading 32bit binaries using lots
* of ugly preprocessor tricks. Talk about very very poor man's inheritance.
*/
#include <linux/types.h>
#include <linux/config.h>
#include <linux/stddef.h>
#include <linux/rwsem.h>
#include <linux/sched.h>
#include <linux/compat.h>
#include <linux/string.h>
#include <linux/binfmts.h>
#include <linux/mm.h>
#include <linux/security.h>
#include <asm/segment.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/user32.h>
#include <asm/sigcontext32.h>
#include <asm/fpu32.h>
#include <asm/i387.h>
#include <asm/uaccess.h>
#include <asm/ia32.h>
#include <asm/vsyscall32.h>
#define ELF_NAME "elf/i386"
#define AT_SYSINFO 32
#define AT_SYSINFO_EHDR 33
int sysctl_vsyscall32 = 1;
#define ARCH_DLINFO do { \
if (sysctl_vsyscall32) { \
NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \
NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE); \
} \
} while(0)
struct file;
struct elf_phdr;
#define IA32_EMULATOR 1
#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000)
#undef ELF_ARCH
#define ELF_ARCH EM_386
#undef ELF_CLASS
#define ELF_CLASS ELFCLASS32
#define ELF_DATA ELFDATA2LSB
#define USE_ELF_CORE_DUMP 1
/* Overwrite elfcore.h */
#define _LINUX_ELFCORE_H 1
typedef unsigned int elf_greg_t;
#define ELF_NGREG (sizeof (struct user_regs_struct32) / sizeof(elf_greg_t))
typedef elf_greg_t elf_gregset_t[ELF_NGREG];
/*
* These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out
* extra segments containing the vsyscall DSO contents. Dumping its
* contents makes post-mortem fully interpretable later without matching up
* the same kernel and hardware config to see what PC values meant.
* Dumping its extra ELF program headers includes all the other information
* a debugger needs to easily find how the vsyscall DSO was being used.
*/
#define ELF_CORE_EXTRA_PHDRS (VSYSCALL32_EHDR->e_phnum)
#define ELF_CORE_WRITE_EXTRA_PHDRS \
do { \
const struct elf32_phdr *const vsyscall_phdrs = \
(const struct elf32_phdr *) (VSYSCALL32_BASE \
+ VSYSCALL32_EHDR->e_phoff); \
int i; \
Elf32_Off ofs = 0; \
for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) { \
struct elf32_phdr phdr = vsyscall_phdrs[i]; \
if (phdr.p_type == PT_LOAD) { \
BUG_ON(ofs != 0); \
ofs = phdr.p_offset = offset; \
phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz); \
phdr.p_filesz = phdr.p_memsz; \
offset += phdr.p_filesz; \
} \
else \
phdr.p_offset += ofs; \
phdr.p_paddr = 0; /* match other core phdrs */ \
DUMP_WRITE(&phdr, sizeof(phdr)); \
} \
} while (0)
#define ELF_CORE_WRITE_EXTRA_DATA \
do { \
const struct elf32_phdr *const vsyscall_phdrs = \
(const struct elf32_phdr *) (VSYSCALL32_BASE \
+ VSYSCALL32_EHDR->e_phoff); \
int i; \
for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) { \
if (vsyscall_phdrs[i].p_type == PT_LOAD) \
DUMP_WRITE((void *) (u64) vsyscall_phdrs[i].p_vaddr, \
PAGE_ALIGN(vsyscall_phdrs[i].p_memsz)); \
} \
} while (0)
struct elf_siginfo
{
int si_signo; /* signal number */
int si_code; /* extra code */
int si_errno; /* errno */
};
#define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0)
struct elf_prstatus
{
struct elf_siginfo pr_info; /* Info associated with signal */
short pr_cursig; /* Current signal */
unsigned int pr_sigpend; /* Set of pending signals */
unsigned int pr_sighold; /* Set of held signals */
pid_t pr_pid;
pid_t pr_ppid;
pid_t pr_pgrp;
pid_t pr_sid;
struct compat_timeval pr_utime; /* User time */
struct compat_timeval pr_stime; /* System time */
struct compat_timeval pr_cutime; /* Cumulative user time */
struct compat_timeval pr_cstime; /* Cumulative system time */
elf_gregset_t pr_reg; /* GP registers */
int pr_fpvalid; /* True if math co-processor being used. */
};
#define ELF_PRARGSZ (80) /* Number of chars for args */
struct elf_prpsinfo
{
char pr_state; /* numeric process state */
char pr_sname; /* char for pr_state */
char pr_zomb; /* zombie */
char pr_nice; /* nice val */
unsigned int pr_flag; /* flags */
__u16 pr_uid;
__u16 pr_gid;
pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
/* Lots missing */
char pr_fname[16]; /* filename of executable */
char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
};
#define __STR(x) #x
#define STR(x) __STR(x)
#define _GET_SEG(x) \
({ __u32 seg; asm("movl %%" STR(x) ",%0" : "=r"(seg)); seg; })
/* Assumes current==process to be dumped */
#define ELF_CORE_COPY_REGS(pr_reg, regs) \
pr_reg[0] = regs->rbx; \
pr_reg[1] = regs->rcx; \
pr_reg[2] = regs->rdx; \
pr_reg[3] = regs->rsi; \
pr_reg[4] = regs->rdi; \
pr_reg[5] = regs->rbp; \
pr_reg[6] = regs->rax; \
pr_reg[7] = _GET_SEG(ds); \
pr_reg[8] = _GET_SEG(es); \
pr_reg[9] = _GET_SEG(fs); \
pr_reg[10] = _GET_SEG(gs); \
pr_reg[11] = regs->orig_rax; \
pr_reg[12] = regs->rip; \
pr_reg[13] = regs->cs; \
pr_reg[14] = regs->eflags; \
pr_reg[15] = regs->rsp; \
pr_reg[16] = regs->ss;
#define user user32
#define __ASM_X86_64_ELF_H 1
#define elf_read_implies_exec(ex, have_pt_gnu_stack) (!(have_pt_gnu_stack))
//#include <asm/ia32.h>
#include <linux/elf.h>
typedef struct user_i387_ia32_struct elf_fpregset_t;
typedef struct user32_fxsr_struct elf_fpxregset_t;
static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
{
ELF_CORE_COPY_REGS((*elfregs), regs)
}
static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs)
{
struct pt_regs *pp = (struct pt_regs *)(t->thread.rsp0);
--pp;
ELF_CORE_COPY_REGS((*elfregs), pp);
/* fix wrong segments */
(*elfregs)[7] = t->thread.ds;
(*elfregs)[9] = t->thread.fsindex;
(*elfregs)[10] = t->thread.gsindex;
(*elfregs)[8] = t->thread.es;
return 1;
}
static inline int
elf_core_copy_task_fpregs(struct task_struct *tsk, struct pt_regs *regs, elf_fpregset_t *fpu)
{
struct _fpstate_ia32 *fpstate = (void*)fpu;
mm_segment_t oldfs = get_fs();
if (!tsk_used_math(tsk))
return 0;
if (!regs)
regs = ((struct pt_regs *)tsk->thread.rsp0) - 1;
if (tsk == current)
unlazy_fpu(tsk);
set_fs(KERNEL_DS);
save_i387_ia32(tsk, fpstate, regs, 1);
/* Correct for i386 bug. It puts the fop into the upper 16bits of
the tag word (like FXSAVE), not into the fcs*/
fpstate->cssel |= fpstate->tag & 0xffff0000;
set_fs(oldfs);
return 1;
}
#define ELF_CORE_COPY_XFPREGS 1
static inline int
elf_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu)
{
struct pt_regs *regs = ((struct pt_regs *)(t->thread.rsp0))-1;
if (!tsk_used_math(t))
return 0;
if (t == current)
unlazy_fpu(t);
memcpy(xfpu, &t->thread.i387.fxsave, sizeof(elf_fpxregset_t));
xfpu->fcs = regs->cs;
xfpu->fos = t->thread.ds; /* right? */
return 1;
}
#undef elf_check_arch
#define elf_check_arch(x) \
((x)->e_machine == EM_386)
extern int force_personality32;
#define ELF_EXEC_PAGESIZE PAGE_SIZE
#define ELF_HWCAP (boot_cpu_data.x86_capability[0])
#define ELF_PLATFORM ("i686")
#define SET_PERSONALITY(ex, ibcs2) \
do { \
unsigned long new_flags = 0; \
if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
new_flags = _TIF_IA32; \
if ((current_thread_info()->flags & _TIF_IA32) \
!= new_flags) \
set_thread_flag(TIF_ABI_PENDING); \
else \
clear_thread_flag(TIF_ABI_PENDING); \
/* XXX This overwrites the user set personality */ \
current->personality |= force_personality32; \
} while (0)
/* Override some function names */
#define elf_format elf32_format
#define init_elf_binfmt init_elf32_binfmt
#define exit_elf_binfmt exit_elf32_binfmt
#define load_elf_binary load_elf32_binary
#define ELF_PLAT_INIT(r, load_addr) elf32_init(r)
#define setup_arg_pages(bprm, stack_top, exec_stack) \
ia32_setup_arg_pages(bprm, stack_top, exec_stack)
int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack);
#undef start_thread
#define start_thread(regs,new_rip,new_rsp) do { \
asm volatile("movl %0,%%fs" :: "r" (0)); \
asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS)); \
load_gs_index(0); \
(regs)->rip = (new_rip); \
(regs)->rsp = (new_rsp); \
(regs)->eflags = 0x200; \
(regs)->cs = __USER32_CS; \
(regs)->ss = __USER32_DS; \
set_fs(USER_DS); \
} while(0)
#define elf_map elf32_map
#include <linux/module.h>
MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries.");
MODULE_AUTHOR("Eric Youngdale, Andi Kleen");
#undef MODULE_DESCRIPTION
#undef MODULE_AUTHOR
#define elf_addr_t __u32
static void elf32_init(struct pt_regs *);
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
#define arch_setup_additional_pages syscall32_setup_pages
extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
#include "../../../fs/binfmt_elf.c"
static void elf32_init(struct pt_regs *regs)
{
struct task_struct *me = current;
regs->rdi = 0;
regs->rsi = 0;
regs->rdx = 0;
regs->rcx = 0;
regs->rax = 0;
regs->rbx = 0;
regs->rbp = 0;
regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
regs->r13 = regs->r14 = regs->r15 = 0;
me->thread.fs = 0;
me->thread.gs = 0;
me->thread.fsindex = 0;
me->thread.gsindex = 0;
me->thread.ds = __USER_DS;
me->thread.es = __USER_DS;
}
int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top,
int executable_stack)
{
unsigned long stack_base;
struct vm_area_struct *mpnt;
struct mm_struct *mm = current->mm;
int i, ret;
stack_base = IA32_STACK_TOP - MAX_ARG_PAGES * PAGE_SIZE;
mm->arg_start = bprm->p + stack_base;
bprm->p += stack_base;
if (bprm->loader)
bprm->loader += stack_base;
bprm->exec += stack_base;
mpnt = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
if (!mpnt)
return -ENOMEM;
memset(mpnt, 0, sizeof(*mpnt));
down_write(&mm->mmap_sem);
{
mpnt->vm_mm = mm;
mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;
mpnt->vm_end = IA32_STACK_TOP;
if (executable_stack == EXSTACK_ENABLE_X)
mpnt->vm_flags = VM_STACK_FLAGS | VM_EXEC;
else if (executable_stack == EXSTACK_DISABLE_X)
mpnt->vm_flags = VM_STACK_FLAGS & ~VM_EXEC;
else
mpnt->vm_flags = VM_STACK_FLAGS;
mpnt->vm_page_prot = (mpnt->vm_flags & VM_EXEC) ?
PAGE_COPY_EXEC : PAGE_COPY;
if ((ret = insert_vm_struct(mm, mpnt))) {
up_write(&mm->mmap_sem);
kmem_cache_free(vm_area_cachep, mpnt);
return ret;
}
mm->stack_vm = mm->total_vm = vma_pages(mpnt);
}
for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
struct page *page = bprm->page[i];
if (page) {
bprm->page[i] = NULL;
install_arg_page(mpnt, page, stack_base);
}
stack_base += PAGE_SIZE;
}
up_write(&mm->mmap_sem);
return 0;
}
EXPORT_SYMBOL(ia32_setup_arg_pages);
static unsigned long
elf32_map (struct file *filep, unsigned long addr, struct elf_phdr *eppnt, int prot, int type)
{
unsigned long map_addr;
struct task_struct *me = current;
down_write(&me->mm->mmap_sem);
map_addr = do_mmap(filep, ELF_PAGESTART(addr),
eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr), prot,
type,
eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr));
up_write(&me->mm->mmap_sem);
return(map_addr);
}
#ifdef CONFIG_SYSCTL
/* Register vsyscall32 into the ABI table */
#include <linux/sysctl.h>
static ctl_table abi_table2[] = {
{ 99, "vsyscall32", &sysctl_vsyscall32, sizeof(int), 0644, NULL,
proc_dointvec },
{ 0, }
};
static ctl_table abi_root_table2[] = {
{ .ctl_name = CTL_ABI, .procname = "abi", .mode = 0555,
.child = abi_table2 },
{ 0 },
};
static __init int ia32_binfmt_init(void)
{
register_sysctl_table(abi_root_table2, 1);
return 0;
}
__initcall(ia32_binfmt_init);
#endif
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