Messages in this thread Patch in this message | | | Subject | [patch 3/8] uml: Fix SKAS sig-handler reentrancy [before 2.6.11] | From | blaisorblade@yahoo ... | Date | Fri, 04 Feb 2005 19:35:46 +0100 |
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From: Jeff Dike <jdike@addtoit.com>, Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> CC: uml-devel <user-mode-linux-devel@lists.sourceforge.net>
This adds code which enables SIGSEGV reception to the SKAS sig_handler_common, which matches the tt code.
I still need to figure out why the SA_NODEFER flag was backed out in favor of this.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> ---
linux-2.6.11-paolo/arch/um/kernel/skas/trap_user.c | 8 ++++++++ 1 files changed, 8 insertions(+)
diff -puN arch/um/kernel/skas/trap_user.c~uml-no-defer arch/um/kernel/skas/trap_user.c --- linux-2.6.11/arch/um/kernel/skas/trap_user.c~uml-no-defer 2005-02-04 06:14:11.966064760 +0100 +++ linux-2.6.11-paolo/arch/um/kernel/skas/trap_user.c 2005-02-04 06:14:11.969064304 +0100 @@ -20,6 +20,14 @@ void sig_handler_common_skas(int sig, vo int save_errno = errno; int save_user; + /* This is done because to allow SIGSEGV to be delivered inside a SEGV + * handler. This can happen in copy_user, and if SEGV is disabled, + * the process will die. + * XXX Figure out why this is better than SA_NODEFER + */ + if(sig == SIGSEGV) + change_sig(SIGSEGV, 1); + r = &TASK_REGS(get_current())->skas; save_user = r->is_user; r->is_user = 0; _ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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