[PW_SID:1127548] x86: Support shstk via prctl by linux-riscv-bot · Pull Request #2282 · linux-riscv/linux

linux-riscv-bot · 2026-07-14T16:05:34Z

PR for series 1127548 applied to workflow__riscv__fixes

Name: x86: Support shstk via prctl
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=1127548
Version: 1

Historically, managing the user-space shadow stack state on x86 has been handled exclusively through the arch_prctl() interface via the ARCH_SHSTK_* operations. However, other architectures (such as arm64 and riscv) do not implement arch_prctl() and instead utilize the newer, arch-agnostic, prctl() interface (i.e. PR_GET_SHADOW_STACK_STATUS and PR_SET_SHADOW_STACK_STATUS). To provide language runtimes, toolchains, and libc implementations with a consistent, cross-architecture interface for managing control-flow integrity, wire up the generic shadow stack prctl handlers for x86. Map the generic PR_SHADOW_STACK_ENABLE, PR_SHADOW_STACK_DISABLE, and PR_SHADOW_STACK_LOCK operations onto the underlying x86 internal CET helper routines. This allows portable userspace applications to toggle or query shadow stack states without relying on architecture-specific system calls, while maintaining backward compatibility with existing arch_prctl() calls. Signed-off-by: Bill Roberts <bill.roberts@arm.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

Run the same test suite for arch_prctl, against prctl, to ensure consisteny and correctness between the interfaces. Signed-off-by: Bill Roberts <bill.roberts@arm.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

linux-riscv-bot · 2026-07-14T16:11:02Z

Patch 1: "[1/2] x86/shstk: support via prctl"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 120.33 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:29:38Z

Patch 1: "[1/2] x86/shstk: support via prctl"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1114.52 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:53:18Z

Patch 1: "[1/2] x86/shstk: support via prctl"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1418.52 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:53:40Z

Patch 1: "[1/2] x86/shstk: support via prctl"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 20.30 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:54:03Z

Patch 1: "[1/2] x86/shstk: support via prctl"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 21.71 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:54:05Z

Patch 1: "[1/2] x86/shstk: support via prctl"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.64 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:55:30Z

Patch 1: "[1/2] x86/shstk: support via prctl"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 82.70 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:55:32Z

Patch 1: "[1/2] x86/shstk: support via prctl"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.39 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:55:34Z

Patch 1: "[1/2] x86/shstk: support via prctl"
kdoc
Desc: Detects for kdoc errors
Duration: 0.76 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:55:36Z

Patch 1: "[1/2] x86/shstk: support via prctl"
module-param
Desc: Detect module_param changes
Duration: 0.25 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:55:38Z

Patch 1: "[1/2] x86/shstk: support via prctl"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.24 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:55:39Z

Patch 1: "[1/2] x86/shstk: support via prctl"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.27 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T16:57:55Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 119.91 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T17:16:40Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1122.60 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T17:40:22Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1421.02 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T17:40:45Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 20.58 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T17:41:08Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 21.99 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T17:41:12Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 2.22 seconds
Result: WARNING
Output:

CHECK: spaces preferred around that '|' (ctx:VxV)
#78: FILE: tools/testing/selftests/x86/test_shadow_stack.c:143:
+	PRCTL(PR_SET_SHADOW_STACK_STATUS, PR_SHADOW_STACK_ENABLE|PR_SHADOW_STACK_WRITE, 0, 0, 0)
 	                                                        ^

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#167: 
new file mode 100644

total: 0 errors, 1 warnings, 1 checks, 133 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 6d3ce92f083c ("selftests/x86: add generic prctl shadow stack test") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 1 warnings, 1 checks, 133 lines checked
CHECK: spaces preferred around that '|' (ctx:VxV)
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?

linux-riscv-bot · 2026-07-14T17:42:36Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 82.43 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T17:42:38Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.45 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T17:42:40Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
kdoc
Desc: Detects for kdoc errors
Duration: 0.74 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T17:42:42Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
module-param
Desc: Detect module_param changes
Duration: 0.23 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T17:42:44Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.22 seconds
Result: PASS

linux-riscv-bot · 2026-07-14T17:42:46Z

Patch 2: "[2/2] selftests/x86: add generic prctl shadow stack test"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.26 seconds
Result: PASS

Linux RISC-V bot and others added 3 commits July 13, 2026 20:05

Adding CI files

f54dc6c

selftests/x86: add generic prctl shadow stack test

6d3ce92

Run the same test suite for arch_prctl, against prctl, to ensure consisteny and correctness between the interfaces. Signed-off-by: Bill Roberts <bill.roberts@arm.com> Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>

linux-riscv-bot force-pushed the workflow__riscv__fixes branch 3 times, most recently from 56b6f30 to 8ca72ef Compare July 15, 2026 17:25

linux-riscv-bot force-pushed the workflow__riscv__fixes branch 2 times, most recently from 60e0882 to 36eafdd Compare July 21, 2026 01:54

linux-riscv-bot closed this Jul 22, 2026

linux-riscv-bot deleted the pw1127548 branch July 22, 2026 01:54

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