[Xenomai-git] Jan Kiszka : nucleus, x86-64: Set canonical default mayday IP
Module: xenomai-head Branch: master Commit: efa97897e0f41458837f96a17ed7d025a90110c5 URL: http://git.xenomai.org/?p=xenomai-head.git;a=commit;h=efa97897e0f41458837f96a17ed7d025a90110c5 Author: Jan Kiszka Date: Thu Jun 30 22:37:52 2011 +0200 nucleus, x86-64: Set canonical default mayday IP User space may invoke sys_mayday unsolicited (ABI mismatch etc.). If mayday.eip happens to hold a random non-canonical value, sysret will crash unexpectedly on Intel CPUs over a user stack, usually causing double faults up to system lockups. Avoid this by initializing eip to 0. Signed-off-by: Jan Kiszka --- include/asm-x86/bits/thread_64.h |3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/include/asm-x86/bits/thread_64.h b/include/asm-x86/bits/thread_64.h index a6dc28c..1256798 100644 --- a/include/asm-x86/bits/thread_64.h +++ b/include/asm-x86/bits/thread_64.h @@ -33,6 +33,9 @@ static inline void xnarch_init_tcb(xnarchtcb_t * tcb) tcb->ripp = &tcb->rip; tcb->fpup = &tcb->i387; tcb->is_root = 0; +#ifdef XNARCH_HAVE_MAYDAY + tcb->mayday.eip = 0; +#endif /* Must be followed by xnarch_init_thread(). */ } ___ Xenomai-git mailing list Xenomai-git@gna.org https://mail.gna.org/listinfo/xenomai-git
[Xenomai-git] Jan Kiszka : nucleus, x86-64: Set canonical default mayday IP
Module: xenomai-jki Branch: for-upstream Commit: efa97897e0f41458837f96a17ed7d025a90110c5 URL: http://git.xenomai.org/?p=xenomai-jki.git;a=commit;h=efa97897e0f41458837f96a17ed7d025a90110c5 Author: Jan Kiszka Date: Thu Jun 30 22:37:52 2011 +0200 nucleus, x86-64: Set canonical default mayday IP User space may invoke sys_mayday unsolicited (ABI mismatch etc.). If mayday.eip happens to hold a random non-canonical value, sysret will crash unexpectedly on Intel CPUs over a user stack, usually causing double faults up to system lockups. Avoid this by initializing eip to 0. Signed-off-by: Jan Kiszka --- include/asm-x86/bits/thread_64.h |3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/include/asm-x86/bits/thread_64.h b/include/asm-x86/bits/thread_64.h index a6dc28c..1256798 100644 --- a/include/asm-x86/bits/thread_64.h +++ b/include/asm-x86/bits/thread_64.h @@ -33,6 +33,9 @@ static inline void xnarch_init_tcb(xnarchtcb_t * tcb) tcb->ripp = &tcb->rip; tcb->fpup = &tcb->i387; tcb->is_root = 0; +#ifdef XNARCH_HAVE_MAYDAY + tcb->mayday.eip = 0; +#endif /* Must be followed by xnarch_init_thread(). */ } ___ Xenomai-git mailing list Xenomai-git@gna.org https://mail.gna.org/listinfo/xenomai-git
