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kernel: usercopy functions

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Matheus
2024-06-09 19:31:26 -03:00
parent 429f56aced
commit 50b4b45d00
53 changed files with 712 additions and 260 deletions
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kernel-src/sys/syscalls/stat.c
+16 -8
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@@ -44,9 +44,8 @@ syscallret_t syscall_fstat(context_t *ctx, int fd, stat_t *ustat) {
if (ret.errno)
goto cleanup;
// TODO safe memcpy
*ustat = buf;
ret.ret = 0;
ret.errno = usercopy_touser(ustat, &buf, sizeof(stat_t));
ret.ret = ret.errno ? -1 : 0;
cleanup:
fd_release(file);
@@ -58,12 +57,22 @@ syscallret_t syscall_fstatat(context_t *ctx, int dirfd, char *upath, stat_t *ust
.ret = -1
};
char *path = alloc(strlen(upath) + 1);
size_t pathlen;
ret.errno = usercopy_strlen(upath, &pathlen);
if (ret.errno)
return ret;
char *path = alloc(pathlen + 1);
if (path == NULL) {
ret.errno = ENOMEM;
return ret;
}
strcpy(path, upath);
ret.errno = usercopy_fromuser(path, upath, pathlen);
if (ret.errno) {
free(path);
return ret;
}
vnode_t *dirnode = NULL;
file_t *file = NULL;
@@ -81,9 +90,8 @@ syscallret_t syscall_fstatat(context_t *ctx, int dirfd, char *upath, stat_t *ust
if (ret.errno)
goto cleanup;
// TODO safe memcpy
*ustat = buf;
ret.ret = 0;
ret.errno = usercopy_touser(ustat, &buf, sizeof(stat_t));
ret.ret = ret.errno ? -1 : 0;
cleanup:
if (node)