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Marvin
2026-09-28 17:46:45 +02:00
committed by Marvin Friedrich
parent 09926f45ee
commit 4a20a5b0af
62 changed files with 1266 additions and 554 deletions
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arch/x86_64/usercopy.c
+14 -8
View File
@@ -1,7 +1,12 @@
#include <zinnia/compiler.h>
#include <zinnia/percpu.h>
#include <arch/usercopy.h>
#include <x86_64/percpu.h>
void arch_usercopy_allow(bool state) {
if (!percpu_ref(arch_data)->can_smap)
return;
if (state) {
asm volatile("stac" ::: "memory");
} else {
@@ -24,7 +29,7 @@ bool arch_usercopy_read(void* dst, const __user void* src, size_t len, struct us
asm volatile(
// Setup regs for `rep movsb`.
" xchg rcx, rdx\n"
" mov rax, [rip + %0]\n"
" lea rax, [rip + %0]\n"
" xchg [rdx], rax\n"
".global x86_64_read_start\n"
@@ -41,7 +46,7 @@ bool arch_usercopy_read(void* dst, const __user void* src, size_t len, struct us
".global x86_64_read_fault\n"
"x86_64_read_fault:\n"
" xor rax, rax\n"
" xchg [rdx], rax\n"
" mov [rdx], rax\n"
" ret\n"
:
: "i"(&read_region)
@@ -64,7 +69,7 @@ bool arch_usercopy_write(__user void* dst, const void* src, size_t len, struct u
asm volatile(
// Setup regs for `rep movsb`.
" xchg rcx, rdx\n"
" mov rax, [rip + %0]\n"
" lea rax, [rip + %0]\n"
" mov [rdx], rax\n"
".global x86_64_write_start\n"
@@ -81,7 +86,7 @@ bool arch_usercopy_write(__user void* dst, const void* src, size_t len, struct u
".global x86_64_write_fault\n"
"x86_64_write_fault:\n"
" xor rax, rax\n"
" xchg [rdx], rax\n"
" mov [rdx], rax\n"
" ret\n"
:
: "i"(&write_region)
@@ -102,18 +107,19 @@ static const struct usercopy_region strlen_region = {
[[__naked]]
bool arch_usercopy_strlen(const __user char* str, size_t max, size_t* len, struct usercopy_region** region) {
asm volatile(
" mov rax, [rip + %0]\n"
" lea rax, [rip + %0]\n"
" xchg [rcx], rax\n"
".global x86_64_strlen_start\n"
" x86_64_strlen_start:\n"
" xor r8, r8\n"
".Lloop:\n"
" cmp r8, rsi\n"
" je .Lleave\n"
" cmp byte ptr [rdi + r8], 0\n"
" je .Lleave\n"
" inc r8\n"
" cmp rsi, r8\n"
" jne .Lloop\n"
" jmp .Lloop\n"
".Lleave:\n"
" mov [rdx], r8\n"
@@ -127,7 +133,7 @@ bool arch_usercopy_strlen(const __user char* str, size_t max, size_t* len, struc
".global x86_64_strlen_fault\n"
"x86_64_strlen_fault:\n"
" xor rax, rax\n"
" xchg [rcx], rax\n"
" mov [rcx], rax\n"
" ret\n"
:
: "i"(&strlen_region)