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feat(kernel/syscalls): implement linux_chmod and linux_fchmod

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Signed-off-by: EnderIce2 <enderice2@protonmail.com>
This commit is contained in:
EnderIce2 2025-03-27 15:52:50 +00:00
parent 7491f19f9a
commit 6240d6638f
Signed by: enderice2
GPG Key ID: FEB6B8A8507BA62E
1 changed files with 57 additions and 11 deletions
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68
Kernel/subsystem/linux/syscall.cpp
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@ -1109,10 +1109,7 @@ static int linux_mprotect(SysFrm *, void *addr, size_t len, int prot)
CPU::x32::invlpg(addr);
#elif defined(__aarch64__)
asmv("dsb sy");
asmv("tlbi vae1is, %0"
:
: "r"(addr)
: "memory");
asmv("tlbi vae1is, %0" : : "r"(addr) : "memory");
asmv("dsb sy");
asmv("isb");
#endif
@ -2136,9 +2133,7 @@ static int linux_uname(SysFrm *, struct utsname *buf)
FileNode *rn = fs->GetByPath("/sys/cfg/cross/linux", pcb->Info.RootNode);
if (rn)
{
struct kstat st
{
};
struct kstat st{};
rn->Stat(&st);
char *sh = new char[st.Size];
@ -2368,6 +2363,57 @@ static ssize_t linux_readlink(SysFrm *, const char *pathname,
return ConvertErrnoToLinux(node->ReadLink(pBuf, bufsiz));
}
static int linux_fchmod(SysFrm *, int fd, mode_t mode)
{
PCB *pcb = thisProcess;
Memory::VirtualMemoryArea *vma = pcb->vma;
vfs::FileDescriptorTable *fdt = pcb->FileDescriptors;
if (fdt->FileMap.find(fd) == fdt->FileMap.end())
return -linux_EBADF;
struct kstat stat;
int ret = fdt->usr_fstat(fd, &stat);
if (ret < 0)
return ret;
if (stat.UserID != pcb->Security.Effective.UserID)
return -linux_EPERM;
/* TODO: check if FS is read-only: -linux_EROFS */
mode_t current = pcb->FileDescriptors->FileMap[fd].Mode;
mode_t newMode = (current & ~07777) | (mode & 07777);
/* TODO: add CAP_FSETID check */
if (stat.GroupID != pcb->Security.Effective.GroupID)
newMode &= ~S_ISGID;
/* FIXME: actually write to FS; maybe with fdt->usr_chmod or similar? */
pcb->FileDescriptors->FileMap[fd].Mode = newMode;
return 0;
}
static int linux_chmod(SysFrm *sf, const char *pathname, mode_t mode)
{
PCB *pcb = thisProcess;
Memory::VirtualMemoryArea *vma = pcb->vma;
const char *pPathname = vma->UserCheckAndGetAddress(pathname);
if (pPathname == nullptr)
return -linux_EFAULT;
FileNode *node = fs->GetByPath(pPathname, pcb->CWD);
if (!node)
return -linux_ENOENT;
vfs::FileDescriptorTable *fdt = pcb->FileDescriptors;
int fd = fdt->usr_open(pPathname, O_RDONLY, 0);
int ret = linux_fchmod(sf, fd, mode);
fdt->usr_close(fd);
return ret;
}
static mode_t linux_umask(SysFrm *, mode_t mask)
{
PCB *pcb = thisProcess;
@ -3462,8 +3508,8 @@ static SyscallData LinuxSyscallsTableAMD64[] = {
[__NR_amd64_unlink] = {"unlink", (void *)nullptr},
[__NR_amd64_symlink] = {"symlink", (void *)nullptr},
[__NR_amd64_readlink] = {"readlink", (void *)linux_readlink},
[__NR_amd64_chmod] = {"chmod", (void *)nullptr},
[__NR_amd64_fchmod] = {"fchmod", (void *)nullptr},
[__NR_amd64_chmod] = {"chmod", (void *)linux_chmod},
[__NR_amd64_fchmod] = {"fchmod", (void *)linux_fchmod},
[__NR_amd64_chown] = {"chown", (void *)nullptr},
[__NR_amd64_fchown] = {"fchown", (void *)nullptr},
[__NR_amd64_lchown] = {"lchown", (void *)nullptr},
@ -3837,7 +3883,7 @@ static SyscallData LinuxSyscallsTableI386[] = {
[__NR_i386_chdir] = {"chdir", (void *)linux_chdir},
[__NR_i386_time] = {"time", (void *)nullptr},
[__NR_i386_mknod] = {"mknod", (void *)nullptr},
[__NR_i386_chmod] = {"chmod", (void *)nullptr},
[__NR_i386_chmod] = {"chmod", (void *)linux_chmod},
[__NR_i386_lchown] = {"lchown", (void *)nullptr},
[__NR_i386_break] = {"break", (void *)nullptr},
[__NR_i386_oldstat] = {"oldstat", (void *)nullptr},
@ -3916,7 +3962,7 @@ static SyscallData LinuxSyscallsTableI386[] = {
[__NR_i386_munmap] = {"munmap", (void *)linux_munmap},
[__NR_i386_truncate] = {"truncate", (void *)nullptr},
[__NR_i386_ftruncate] = {"ftruncate", (void *)nullptr},
[__NR_i386_fchmod] = {"fchmod", (void *)nullptr},
[__NR_i386_fchmod] = {"fchmod", (void *)linux_fchmod},
[__NR_i386_fchown] = {"fchown", (void *)nullptr},
[__NR_i386_getpriority] = {"getpriority", (void *)nullptr},
[__NR_i386_setpriority] = {"setpriority", (void *)nullptr},