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authorDavid S. Miller <davem@davemloft.net>2017-08-04 09:47:52 -0700
committerDavid S. Miller <davem@davemloft.net>2017-08-04 09:47:52 -0700
commit0ede1c401332173ab0693121dc6cde04a4dbf131 (patch)
tree7c2df177e5d95de4740fcf20c48c8a4415cae6cb /arch/sparc/lib
parentsbus: Convert to using %pOF instead of full_name (diff)
downloadlinux-dev-0ede1c401332173ab0693121dc6cde04a4dbf131.tar.xz
linux-dev-0ede1c401332173ab0693121dc6cde04a4dbf131.zip
sparc64: Fix exception handling in UltraSPARC-III memcpy.
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>
Diffstat (limited to 'arch/sparc/lib')
-rw-r--r--arch/sparc/lib/U3memcpy.S4
1 files 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