f144e7c727
Fix atomicity of TIF update in flush_thread() for powerpc
Fixes it correctly with *_ti_thread_flag.
Race :
parent process executing :
sys_ptrace()
(lock_kernel())
(ptrace_get_task_struct(pid))
arch_ptrace()
ptrace_detach()
ptrace_disable(child);
clear_singlestep(child);
clear_tsk_thread_flag(child, TIF_SINGLESTEP);
(which clears the TIF_SINGLESTEP flag atomically from a different
process)
(put_task_struct(child))
(unlock_kernel())
And at the same time, in the child process :
sys_execve()
do_execve()
search_binary_handler()
load_elf_binary()
flush_old_exec()
flush_thread()
doing a non-atomic thread flag update
Applies on 2.6.20.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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| .. | ||
| vdso32 | ||
| vdso64 | ||
| Makefile | ||
| align.c | ||
| asm-offsets.c | ||
| audit.c | ||
| binfmt_elf32.c | ||
| btext.c | ||
| compat_audit.c | ||
| cpu_setup_6xx.S | ||
| cpu_setup_pa6t.S | ||
| cpu_setup_ppc970.S | ||
| cputable.c | ||
| crash.c | ||
| crash_dump.c | ||
| dma_64.c | ||
| entry_32.S | ||
| entry_64.S | ||
| firmware.c | ||
| fpu.S | ||
| head_4xx.S | ||
| head_8xx.S | ||
| head_32.S | ||
| head_44x.S | ||
| head_64.S | ||
| head_booke.h | ||
| head_fsl_booke.S | ||
| ibmebus.c | ||
| idle.c | ||
| idle_6xx.S | ||
| idle_power4.S | ||
| init_task.c | ||
| io.c | ||
| iomap.c | ||
| iommu.c | ||
| irq.c | ||
| kprobes.c | ||
| l2cr_6xx.S | ||
| legacy_serial.c | ||
| lparcfg.c | ||
| lparmap.c | ||
| machine_kexec.c | ||
| machine_kexec_32.c | ||
| machine_kexec_64.c | ||
| misc.S | ||
| misc_32.S | ||
| misc_64.S | ||
| module_32.c | ||
| module_64.c | ||
| nvram_64.c | ||
| of_device.c | ||
| of_platform.c | ||
| paca.c | ||
| pci_32.c | ||
| pci_64.c | ||
| pci_dn.c | ||
| pmc.c | ||
| ppc32.h | ||
| ppc_ksyms.c | ||
| proc_ppc64.c | ||
| process.c | ||
| prom.c | ||
| prom_init.c | ||
| prom_parse.c | ||
| ptrace-common.h | ||
| ptrace.c | ||
| ptrace32.c | ||
| rtas-proc.c | ||
| rtas-rtc.c | ||
| rtas.c | ||
| rtas_flash.c | ||
| rtas_pci.c | ||
| semaphore.c | ||
| setup-common.c | ||
| setup.h | ||
| setup_32.c | ||
| setup_64.c | ||
| signal_32.c | ||
| signal_64.c | ||
| smp-tbsync.c | ||
| smp.c | ||
| swsusp_32.S | ||
| sys_ppc32.c | ||
| syscalls.c | ||
| sysfs.c | ||
| systbl.S | ||
| tau_6xx.c | ||
| time.c | ||
| traps.c | ||
| udbg.c | ||
| udbg_16550.c | ||
| vdso.c | ||
| vecemu.c | ||
| vector.S | ||
| vio.c | ||
| vmlinux.lds.S | ||