When returning from the user probe code into userspace process, PC & NPC are
truncated to 32 bits.
Due to shared libraries getting loaded very high in the virtual address
space of
the process, placing a user probe inside a shared library makes the kernel
return into the process at the wrong address, causing it to seg'fault
most of
the time.
This patch prevents truncating PC and NPC.
Signed-off-by: Eric Saint Etienne <eric.saint.etienne@xxxxxxxxxx>
Reviewed-by: David Aldridge <david.j.aldridge@xxxxxxxxxx>
---
arch/sparc/include/asm/uprobes.h | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/sparc/include/asm/uprobes.h
b/arch/sparc/include/asm/uprobes.h
index f87aae5..36196c1 100644
--- a/arch/sparc/include/asm/uprobes.h
+++ b/arch/sparc/include/asm/uprobes.h
@@ -42,8 +42,8 @@ struct arch_uprobe {
};
struct arch_uprobe_task {
- u32 saved_tpc;
- u32 saved_tnpc;
+ u64 saved_tpc;
+ u64 saved_tnpc;
};
struct task_struct;
--
1.7.1
--
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