4.4-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 0ede1c401332173ab0693121dc6cde04a4dbf131 ]
Mikael Pettersson reported that some test programs in the strace-4.18 testsuite cause an OOPS.
After some debugging it turns out that garbage values are returned when an exception occurs, causing the fixup memset() to be run with bogus arguments.
The problem is that two of the exception handler stubs write the successfully copied length into the wrong register.
Fixes: ee841d0aff64 ("sparc64: Convert U3copy_{from,to}_user to accurate exception reporting.") Reported-by: Mikael Pettersson mikpelinux@gmail.com Tested-by: Mikael Pettersson mikpelinux@gmail.com Reviewed-by: Sam Ravnborg sam@ravnborg.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- arch/sparc/lib/U3memcpy.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/sparc/lib/U3memcpy.S b/arch/sparc/lib/U3memcpy.S index 54f98706b03b..5a8cb37f0a3b 100644 --- a/arch/sparc/lib/U3memcpy.S +++ b/arch/sparc/lib/U3memcpy.S @@ -145,13 +145,13 @@ ENDPROC(U3_retl_o2_plus_GS_plus_0x08) ENTRY(U3_retl_o2_and_7_plus_GS) and %o2, 7, %o2 retl - add %o2, GLOBAL_SPARE, %o2 + add %o2, GLOBAL_SPARE, %o0 ENDPROC(U3_retl_o2_and_7_plus_GS) ENTRY(U3_retl_o2_and_7_plus_GS_plus_8) add GLOBAL_SPARE, 8, GLOBAL_SPARE and %o2, 7, %o2 retl - add %o2, GLOBAL_SPARE, %o2 + add %o2, GLOBAL_SPARE, %o0 ENDPROC(U3_retl_o2_and_7_plus_GS_plus_8) #endif