forked from luck/tmp_suning_uos_patched
8cb3ed1393
The 32-bit ptrace syscall on a 64-bit kernel (32-bit debugger on 32-bit task) behaves differently than a native 32-bit kernel. When setting a register state of orig_eax>=0 and eax=-ERESTART* when the debugged task is NOT on its way out of a 32-bit syscall, the task will fail to do the syscall restart logic that it should do. Test case available at http://sources.redhat.com/cgi-bin/cvsweb.cgi/~checkout~/tests/ptrace-tests/tests/erestartsys-trap.c?cvsroot=systemtap This happens because the 32-bit ptrace syscall sets eax=0xffffffff when it sets orig_eax>=0. The resuming task will not sign-extend this for the -ERESTART* check because TS_COMPAT is not set. (So the task thinks it is restarting after a 64-bit syscall, not a 32-bit one.) The fix is to have 32-bit ptrace calls set TS_COMPAT when setting orig_eax>=0. This ensures that the 32-bit syscall restart logic will apply when the child resumes. Signed-off-by: Roland McGrath <roland@redhat.com> |
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| .. | ||
| boot | ||
| configs | ||
| crypto | ||
| ia32 | ||
| include/asm | ||
| kernel | ||
| kvm | ||
| lguest | ||
| lib | ||
| math-emu | ||
| mm | ||
| oprofile | ||
| pci | ||
| power | ||
| vdso | ||
| video | ||
| xen | ||
| Kbuild | ||
| Kconfig | ||
| Kconfig.cpu | ||
| Kconfig.debug | ||
| Makefile | ||
| Makefile_32.cpu | ||