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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e22438f8e9
On AMD CPUs, SYSRET can return with a valid SS descriptor with
with the hidden attributes set to an unusable state. Make sure
the kernel doesn't let this happen. This detects an
as-yet-unfixed regression.
Note that the 64-bit version of this test fails on AMD CPUs on
all kernel versions, although the issue in the 64-bit case is
much less severe than in the 32-bit case.
Reported-by: Brian Gerst <brgerst@gmail.com>
Tested-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Tests: e7d6eefaaa ("x86/vdso32/syscall.S: Do not load __USER32_DS to %ss")
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/resend_4d740841bac383742949e2fefb03982736595087.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
52 lines
1.3 KiB
Makefile
52 lines
1.3 KiB
Makefile
.PHONY: all all_32 all_64 check_build32 clean run_tests
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TARGETS_C_BOTHBITS := sigreturn single_step_syscall sysret_ss_attrs
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BINARIES_32 := $(TARGETS_C_BOTHBITS:%=%_32)
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BINARIES_64 := $(TARGETS_C_BOTHBITS:%=%_64)
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CFLAGS := -O2 -g -std=gnu99 -pthread -Wall
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UNAME_P := $(shell uname -p)
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# Always build 32-bit tests
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all: all_32
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# If we're on a 64-bit host, build 64-bit tests as well
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ifeq ($(shell uname -p),x86_64)
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all: all_64
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endif
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all_32: check_build32 $(BINARIES_32)
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all_64: $(BINARIES_64)
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clean:
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$(RM) $(BINARIES_32) $(BINARIES_64)
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run_tests:
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./run_x86_tests.sh
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$(TARGETS_C_BOTHBITS:%=%_32): %_32: %.c
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$(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
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$(TARGETS_C_BOTHBITS:%=%_64): %_64: %.c
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$(CC) -m64 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
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check_build32:
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@if ! $(CC) -m32 -o /dev/null trivial_32bit_program.c; then \
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echo "Warning: you seem to have a broken 32-bit build" 2>&1; \
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echo "environment. If you are using a Debian-like"; \
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echo " distribution, try:"; \
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echo ""; \
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echo " apt-get install gcc-multilib libc6-i386 libc6-dev-i386"; \
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echo ""; \
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echo "If you are using a Fedora-like distribution, try:"; \
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echo ""; \
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echo " yum install glibc-devel.*i686"; \
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exit 1; \
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fi
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# Some tests have additional dependencies.
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sysret_ss_attrs_64: thunks.S
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