linux-toradex.git/tools/testing/selftests/riscv, branch master

prctl: cfi: change the branch landing pad prctl()s to be more descriptive

2026-04-05T00:40:58+00:00

Per Linus' comments requesting the replacement of "INDIR_BR_LP" in the
indirect branch tracking prctl()s with something more readable, and
suggesting the use of the speculation control prctl()s as an exemplar,
reimplement the prctl()s and related constants that control per-task
forward-edge control flow integrity.

This primarily involves two changes.  First, the prctls are
restructured to resemble the style of the speculative execution
workaround control prctls PR_{GET,SET}_SPECULATION_CTRL, to make them
easier to extend in the future.  Second, the "indir_br_lp" abbrevation
is expanded to "branch_landing_pads" to be less telegraphic.  The
kselftest and documentation is adjusted accordingly.

Link: https://lore.kernel.org/linux-riscv/CAHk-=whhSLGZAx3N5jJpb4GLFDqH_QvS07D+6BnkPWmCEzTAgw@mail.gmail.com/
Cc: Deepak Gupta 
Cc: Linus Torvalds 
Cc: Mark Brown 
Signed-off-by: Paul Walmsley

riscv: ptrace: cfi: expand "SS" references to "shadow stack" in uapi headers

2026-04-05T00:40:58+00:00

Similar to the recent change to expand "LP" to "branch landing pad",
let's expand "SS" in the ptrace uapi macros to "shadow stack" as well.
This aligns with the existing prctl() arguments, which use the
expanded "shadow stack" names, rather than just the abbreviation.

Link: https://lore.kernel.org/linux-riscv/CAHk-=whhSLGZAx3N5jJpb4GLFDqH_QvS07D+6BnkPWmCEzTAgw@mail.gmail.com/
Cc: Deepak Gupta 
Signed-off-by: Paul Walmsley

riscv: ptrace: expand "LP" references to "branch landing pads" in uapi headers

2026-04-05T00:40:58+00:00

Per Linus' comments about the unreadability of abbreviations such as
"LP", rename the RISC-V ptrace landing pad CFI macro names to be more
explicit.  This primarily involves expanding "LP" in the names to some
variant of "branch landing pad."

Link: https://lore.kernel.org/linux-riscv/CAHk-=whhSLGZAx3N5jJpb4GLFDqH_QvS07D+6BnkPWmCEzTAgw@mail.gmail.com/
Cc: Deepak Gupta 
Signed-off-by: Paul Walmsley

selftests: riscv: Add braces around EXPECT_EQ()

2026-04-05T00:37:57+00:00

EXPECT_EQ() expands to multiple lines, breaking up one-line if
statements. This issue was not present in the patch on the mailing list
but was instead introduced by the maintainer when attempting to fix up
checkpatch warnings. Add braces around EXPECT_EQ() to avoid the error
even though checkpatch suggests them to be removed:

validate_v_ptrace.c:626:17: error: ‘else’ without a previous ‘if’

Fixes: 3789d5eecd5a ("selftests: riscv: verify syscalls discard vector context")
Fixes: 30eb191c895b ("selftests: riscv: verify ptrace rejects invalid vector csr inputs")
Fixes: 849f05ae1ea6 ("selftests: riscv: verify ptrace accepts valid vector csr values")
Signed-off-by: Charlie Jenkins 
Reviewed-and-tested-by: Sergey Matyukevich 
Link: https://patch.msgid.link/20260309-fix_selftests-v2-2-9d5a553a531e@gmail.com
Signed-off-by: Paul Walmsley

riscv: use _BITUL macro rather than BIT() in ptrace uapi and kselftests

2026-04-05T00:37:54+00:00

Fix the build of non-kernel code that includes the RISC-V ptrace uapi
header, and the RISC-V validate_v_ptrace.c kselftest, by using the
_BITUL() macro rather than BIT().  BIT() is not available outside
the kernel.

Based on patches and comments from Charlie Jenkins, Michael Neuling,
and Andreas Schwab.

Fixes: 30eb191c895b ("selftests: riscv: verify ptrace rejects invalid vector csr inputs")
Fixes: 2af7c9cf021c ("riscv/ptrace: expose riscv CFI status and state via ptrace and in core files")
Cc: Andreas Schwab 
Cc: Michael Neuling 
Cc: Charlie Jenkins 
Link: https://patch.msgid.link/20260330024248.449292-1-mikey@neuling.org
Link: https://lore.kernel.org/linux-riscv/20260309-fix_selftests-v2-1-9d5a553a531e@gmail.com/
Link: https://lore.kernel.org/linux-riscv/20260309-fix_selftests-v2-3-9d5a553a531e@gmail.com/
Signed-off-by: Paul Walmsley

selftests: riscv: vstate_exec_nolibc: Use the regular prctl() function

2026-02-09T22:27:33+00:00

The my_syscall*() macros are internal implementation details of nolibc.

Now that nolibc has a normal prctl() function, use that.

Signed-off-by: Thomas Weißschuh 
Link: https://patch.msgid.link/20260117-nolibc-mysyscall-riscv-v1-1-0ae1ae3513e9@weissschuh.net
Signed-off-by: Paul Walmsley

selftests: riscv: verify ptrace accepts valid vector csr values

2026-02-09T22:27:33+00:00

Add a test to v_ptrace test suite to verify that ptrace accepts the
valid input combinations of vector csr registers. Use kselftest
fixture variants to create multiple inputs for the test.

The test simulates a debug scenario with three breakpoints:
0. init: let the tracee set up its initial vector configuration
1. 1st bp:  modify the tracee's vector csr registers from the debugger
  - resume the tracee to execute a block without vector instructions
2. 2nd bp: read back the tracees's vector csr registers from the debugger
  - compare with values set by the debugger
  - resume the tracee to execute a block with vector instructions
3. 3rd bp: read back the tracess's vector csr registers again
  - compare with values set by the debugger

The last check helps to confirm that ptrace validation check for vector
csr registers input values works properly and maintains an accurate view
of the tracee's vector context in debugger.

Signed-off-by: Sergey Matyukevich 
Tested-by: Andy Chiu 
Link: https://patch.msgid.link/20251214163537.1054292-10-geomatsi@gmail.com
[pjw@kernel.org: cleaned up a checkpatch issue]
Signed-off-by: Paul Walmsley

selftests: riscv: verify ptrace rejects invalid vector csr inputs

2026-02-09T22:27:33+00:00

Add a test to v_ptrace test suite to verify that ptrace rejects the
invalid input combinations of vector csr registers. Use kselftest
fixture variants to create multiple invalid inputs for the test.

Signed-off-by: Sergey Matyukevich 
Tested-by: Andy Chiu 
Link: https://patch.msgid.link/20251214163537.1054292-9-geomatsi@gmail.com
[pjw@kernel.org: cleaned up some checkpatch issues]
Signed-off-by: Paul Walmsley

selftests: riscv: verify syscalls discard vector context

2026-02-09T22:27:33+00:00

Add a test to v_ptrace test suite to verify that vector csr registers
are clobbered on syscalls.

Signed-off-by: Sergey Matyukevich 
Reviewed-by: Andy Chiu 
Tested-by: Andy Chiu 
Link: https://patch.msgid.link/20251214163537.1054292-8-geomatsi@gmail.com
[pjw@kernel.org: cleaned up a checkpatch issue]
Signed-off-by: Paul Walmsley

selftests: riscv: verify initial vector state with ptrace

2026-02-09T22:27:33+00:00

Add a test case that attaches to a traced process immediately after its
first executed vector instructions to verify the initial vector context.

Signed-off-by: Sergey Matyukevich 
Reviewed-by: Andy Chiu 
Tested-by: Andy Chiu 
Link: https://patch.msgid.link/20251214163537.1054292-7-geomatsi@gmail.com
Signed-off-by: Paul Walmsley