OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PATCH] powerpc: fix incorrect SA_ONSTACK behaviour for 64-bit processes 

*) When setting a sighandler using sigaction() call, if the flag
SA_ONSTACK is set and no alternate stack is provided via sigaltstack(),
the kernel still try to install the alternate stack. This behavior is
the opposite of the one which is documented in Single Unix
Specifications V3.

*) Also when setting an alternate stack using sigaltstack() with the
flag SS_DISABLE, the kernel try to install the alternate stack on
signal delivery.

These two use cases makes the process crash at signal delivery.

This fixes it.

Signed-off-by: Laurent Meyer <meyerlau@fr.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Laurent MEYER 2006-03-27 11:37:41 +02:00 committed by Paul Mackerras
parent 5149fa47ec
commit 11089f08d9
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/kernel/signal_64.c
View File

@ -212,7 +212,7 @@ static inline void __user * get_sigframe(struct k_sigaction *ka, struct pt_regs
/* Default to using normal stack */
newsp = regs->gpr[1];
if (ka->sa.sa_flags & SA_ONSTACK) {
if ((ka->sa.sa_flags & SA_ONSTACK) && current->sas_ss_size) {
if (! on_sig_stack(regs->gpr[1]))
newsp = (current->sas_ss_sp + current->sas_ss_size);
}