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kernel: ldt support

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Matheus
2026-03-20 21:23:59 -03:00
parent a73c82f912
commit 41f97c6c61
17 changed files with 315 additions and 94 deletions
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kernel-src/arch/x86-64/archctl.c
+17
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@@ -8,11 +8,17 @@
#define ARCH_CTL_GET_GSBASE 2
#define ARCH_CTL_GET_FSBASE 3
#define ARCH_CTL_SET_SYSTRACE 4
#define ARCH_CTL_SET_LDT_ENTRY 5
#define ARCH_CTL_SYSTRACE_OFF 0
#define ARCH_CTL_SYSTRACE_SELF 1
#define ARCH_CTL_SYSTRACE_ALL 2
typedef struct {
uint64_t entry;
uint16_t seg;
} archctl_ldt_request_t;
static inline int copy_u64_to_user(void *ptr, uint64_t v) {
return usercopy_touser(ptr, &v, sizeof(v));
}
@@ -25,9 +31,11 @@ syscallret_t syscall_archctl(context_t *context, int func, void *arg) {
if (!IS_USER_ADDRESS(arg)) {
ret.errno = EFAULT;
ret.ret = -1;
return ret;
}
uint64_t scratch;
switch (func) {
case ARCH_CTL_SET_GSBASE:
// kernelgsbase because it will be switched out to user
@@ -42,6 +50,14 @@ syscallret_t syscall_archctl(context_t *context, int func, void *arg) {
case ARCH_CTL_GET_FSBASE:
ret.errno = copy_u64_to_user(arg, rdmsr(MSR_FSBASE));
break;
case ARCH_CTL_SET_LDT_ENTRY:
archctl_ldt_request_t req;
ret.errno = usercopy_fromuser(&req, arg, sizeof(req));
if (ret.errno)
break;
ret.errno = arch_ldt_set_entry(req.seg, req.entry);
break;
case ARCH_CTL_SET_SYSTRACE:
#ifdef SYSCALL_LOGGING
switch ((uint64_t)arg) {
@@ -69,5 +85,6 @@ syscallret_t syscall_archctl(context_t *context, int func, void *arg) {
break;
}
ret.ret = ret.errno ? -1 : 0;
return ret;
}