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authorDavid S. Miller <davem@davemloft.net>2008-07-31 20:40:46 -0700
committerDavid S. Miller <davem@davemloft.net>2008-07-31 20:40:46 -0700
commit0a4949c4414af2eb91414bcd8e2a8ac3706f7dde (patch)
tree5f05f6f539741587127900bbdd838a2e882fcdbf /arch/sparc64/kernel/signal.c
parentdbf3e950679b2588e554baa4da94c445c7903e24 (diff)
downloadlinux-2.6.34-ux500-0a4949c4414af2eb91414bcd8e2a8ac3706f7dde.tar.gz
sparc64: Do not clobber %g7 in setcontext() trap.
That's the userland thread register, so we should never try to change it like this. Based upon glibc bug nptl/6577 and suggestions by Jakub Jelinek. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/signal.c')
-rw-r--r--arch/sparc64/kernel/signal.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c
index d1b84456a9e..ca5a6ae3a6e 100644
--- a/arch/sparc64/kernel/signal.c
+++ b/arch/sparc64/kernel/signal.c
@@ -2,7 +2,7 @@
* arch/sparc64/kernel/signal.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
* Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
@@ -91,7 +91,9 @@ asmlinkage void sparc64_set_context(struct pt_regs *regs)
err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
- err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
+
+ /* Skip %g7 as that's the thread register in userspace. */
+
err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));