https://bugs.kde.org/show_bug.cgi?id=506596
Bug ID: 506596
Summary: arch_prctl ARCH_SET_CPUID/ARCH_GET_CPUID don't work
Classification: Developer tools
Product: valgrind
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
The ltp arch_prctl01 test fails:
Command:
./auxprogs/auxchecks/ltp-full-20250530/testcases/kernel/syscalls/arch_prctl/arch_prctl01
tst_test.c:1953: TINFO: LTP version: VALGRIND_3_25_0-71-gf89b54e8a601
tst_test.c:1956: TINFO: Tested kernel: 6.14.11-300.fc42.x86_64 #1 SMP
PREEMPT_DYNAMIC Tue Jun 10 16:24:16 UTC 2025 x86_64
tst_kconfig.c:88: TINFO: Parsing kernel config
'/lib/modules/6.14.11-300.fc42.x86_64/build/.config'
tst_test.c:1774: TINFO: Overall timeout per run is 0h 00m 30s
arch_prctl01.c:54: TFAIL: arch_prctl_set(ARCH_SET_CPUID, index) failed: EINVAL
(22)
arch_prctl01.c:66: TFAIL: get wrong cpuid status
arch_prctl01.c:54: TFAIL: arch_prctl_set(ARCH_SET_CPUID, index) failed: EINVAL
(22)
arch_prctl01.c:66: TFAIL: get wrong cpuid status
PRE(sys_arch_prctl) in coregrind/m_syswrap/syswrap-amd64-linux.c doesn't
recognize ARCH_SET_CPUID and explicitly sets EINVAL.
ARCH_SET_CPUID enables or disables the cpuid instruction for the calling
thread. If disabled trying to execute a cpuid instruction causes a SEGSEGV.
We would have to emulate that in VEX/priv/guest_amd64_toIR.c (and
VEX/priv/guest_x86_toIR.c)
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