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sparc64: fix for user probes in high memory

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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@oracle.com>
Reviewed-by: David Aldridge <david.j.aldridge@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Saint Etienne 2017-02-06 14:32:41 +00:00 committed by David S. Miller
parent fc5e8c2839
commit 269d852358
1 changed files with 2 additions and 2 deletions
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4
arch/sparc/include/asm/uprobes.h
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@ -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;