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[NTOS:KE/x64] On syscalls clear nested task flag

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When this flag is not cleared and the system returns with an IRET, this causes a #GP. Randomly hit by the umkm:SystemCall test.
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Timo Kreuzer 2024-04-24 19:46:23 +03:00
parent 701b0a3f24
commit b8e50f787d
1 changed files with 1 additions and 1 deletions
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2
ntoskrnl/ke/amd64/kiinit.c
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@ -218,7 +218,7 @@ KiInitializeCpu(PKIPCR Pcr)
((ULONG64)(KGDT64_R3_CMCODE|RPL_MASK) << 48));
/* Set the flags to be cleared when doing a syscall */
__writemsr(MSR_SYSCALL_MASK, EFLAGS_IF_MASK | EFLAGS_TF | EFLAGS_DF);
__writemsr(MSR_SYSCALL_MASK, EFLAGS_IF_MASK | EFLAGS_TF | EFLAGS_DF | EFLAGS_NESTED_TASK);
/* Enable syscall instruction and no-execute support */
__writemsr(MSR_EFER, __readmsr(MSR_EFER) | MSR_SCE | MSR_NXE);