bd1d6e2451
We have a customer application which trips a bug. The problem arises when a driver attempts to call do_munmap on an area which is mapped, but because current->thread.task_size has been set to 0xC0000000, the call to do_munmap fails thinking it is an unmap beyond the user's address space. The comment in fs/binfmt_elf.c in load_elf_library() before the call to SET_PERSONALITY() indicates that task_size must not be changed for the running application until flush_thread, but is for ia64 executing ia32 binaries. This patch moves the setting of task_size from SET_PERSONALITY() to flush_thread() as indicated. The customer application no longer is able to trip the bug. Signed-off-by: Robin Holt <holt@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
#ifndef _ASM_IA64_IA32_H
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#define _ASM_IA64_IA32_H
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#include <linux/config.h>
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#include <asm/ptrace.h>
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#include <asm/signal.h>
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#define IA32_NR_syscalls 285 /* length of syscall table */
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#define IA32_PAGE_SHIFT 12 /* 4KB pages */
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#ifndef __ASSEMBLY__
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# ifdef CONFIG_IA32_SUPPORT
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#define IA32_PAGE_OFFSET 0xc0000000
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extern void ia32_cpu_init (void);
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extern void ia32_mem_init (void);
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extern void ia32_gdt_init (void);
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extern int ia32_exception (struct pt_regs *regs, unsigned long isr);
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extern int ia32_intercept (struct pt_regs *regs, unsigned long isr);
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extern int ia32_clone_tls (struct task_struct *child, struct pt_regs *childregs);
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# endif /* !CONFIG_IA32_SUPPORT */
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/* Declare this unconditionally, so we don't get warnings for unreachable code. */
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extern int ia32_setup_frame1 (int sig, struct k_sigaction *ka, siginfo_t *info,
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sigset_t *set, struct pt_regs *regs);
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#if PAGE_SHIFT > IA32_PAGE_SHIFT
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extern int ia32_copy_partial_page_list (struct task_struct *, unsigned long);
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extern void ia32_drop_partial_page_list (struct task_struct *);
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#else
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# define ia32_copy_partial_page_list(a1, a2) 0
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# define ia32_drop_partial_page_list(a1) do { ; } while (0)
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#endif
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_IA64_IA32_H */
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