From bd1d6e2451f2bb0132416fda4d129c4f57a827bc Mon Sep 17 00:00:00 2001 From: Robin Holt Date: Mon, 5 Dec 2005 20:02:31 -0600 Subject: [IA64] Change SET_PERSONALITY to comply with comment in binfmt_elf.c. 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 Signed-off-by: Tony Luck --- arch/ia64/ia32/binfmt_elf32.c | 2 -- arch/ia64/ia32/ia32priv.h | 1 - arch/ia64/kernel/process.c | 5 ++++- 3 files changed, 4 insertions(+), 4 deletions(-) (limited to 'arch') diff --git a/arch/ia64/ia32/binfmt_elf32.c b/arch/ia64/ia32/binfmt_elf32.c index a7280d9f6c1..4e7a6a1ec6c 100644 --- a/arch/ia64/ia32/binfmt_elf32.c +++ b/arch/ia64/ia32/binfmt_elf32.c @@ -261,8 +261,6 @@ elf32_set_personality (void) { set_personality(PER_LINUX32); current->thread.map_base = IA32_PAGE_OFFSET/3; - current->thread.task_size = IA32_PAGE_OFFSET; /* use what Linux/x86 uses... */ - set_fs(USER_DS); /* set addr limit for new TASK_SIZE */ } static unsigned long diff --git a/arch/ia64/ia32/ia32priv.h b/arch/ia64/ia32/ia32priv.h index e3e9290e3ff..68ceb4e690c 100644 --- a/arch/ia64/ia32/ia32priv.h +++ b/arch/ia64/ia32/ia32priv.h @@ -305,7 +305,6 @@ struct old_linux32_dirent { #define ELF_DATA ELFDATA2LSB #define ELF_ARCH EM_386 -#define IA32_PAGE_OFFSET 0xc0000000 #define IA32_STACK_TOP IA32_PAGE_OFFSET #define IA32_GATE_OFFSET IA32_PAGE_OFFSET #define IA32_GATE_END IA32_PAGE_OFFSET + PAGE_SIZE diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c index 2e33665d9c1..a4da715a360 100644 --- a/arch/ia64/kernel/process.c +++ b/arch/ia64/kernel/process.c @@ -721,8 +721,11 @@ flush_thread (void) /* drop floating-point and debug-register state if it exists: */ current->thread.flags &= ~(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID); ia64_drop_fpu(current); - if (IS_IA32_PROCESS(ia64_task_regs(current))) + if (IS_IA32_PROCESS(ia64_task_regs(current))) { ia32_drop_partial_page_list(current); + current->thread.task_size = IA32_PAGE_OFFSET; + set_fs(USER_DS); + } } /* -- cgit v1.2.3