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kselftest/arm64: Fix validatation termination record after EXTRA_CONTEXT 

[ Upstream commit 5c152c2f66 ]

When arm64 signal context data overflows the base struct sigcontext it gets
placed in an extra buffer pointed to by a record of type EXTRA_CONTEXT in
the base struct sigcontext which is required to be the last record in the
base struct sigframe. The current validation code attempts to check this
by using GET_RESV_NEXT_HEAD() to step forward from the current record to
the next but that is a macro which assumes it is being provided with a
struct _aarch64_ctx and uses the size there to skip forward to the next
record. Instead validate_extra_context() passes it a struct extra_context
which has a separate size field. This compiles but results in us trying
to validate a termination record in completely the wrong place, at best
failing validation and at worst just segfaulting. Fix this by passing
the struct _aarch64_ctx we meant to into the macro.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220829160703.874492-4-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mark Brown 2022-08-29 17:06:56 +01:00 committed by Greg Kroah-Hartman
parent 010d3fd16a
commit f7205229ee
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/arm64/signal/testcases/testcases.c
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@ -33,7 +33,7 @@ bool validate_extra_context(struct extra_context *extra, char **err)
return false;
fprintf(stderr, "Validating EXTRA...\n");
term = GET_RESV_NEXT_HEAD(extra);
term = GET_RESV_NEXT_HEAD(&extra->head);
if (!term || term->magic || term->size) {
*err = "Missing terminator after EXTRA context";
return false;