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| author | Robin Holt <holt@sgi.com> | 2005-12-05 20:02:31 -0600 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2005-12-06 09:12:34 -0800 |
| commit | bd1d6e2451f2bb0132416fda4d129c4f57a827bc (patch) | |
| tree | 64fc1ba7d4734ea5ecec8942795b32a32e4623a4 /arch/ia64/kernel/process.c | |
| parent | acb7f67280128a9ddaa756ff10212391d28caec4 (diff) | |
| download | kernel_samsung_tuna-bd1d6e2451f2bb0132416fda4d129c4f57a827bc.zip kernel_samsung_tuna-bd1d6e2451f2bb0132416fda4d129c4f57a827bc.tar.gz kernel_samsung_tuna-bd1d6e2451f2bb0132416fda4d129c4f57a827bc.tar.bz2 | |
[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 <holt@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/process.c')
| -rw-r--r-- | arch/ia64/kernel/process.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c index 2e33665..a4da715 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); + } } /* |