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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/readlinkat.c
+14 -6
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@@ -4,18 +4,27 @@
#include <kernel/alloc.h>
#include <arch/cpu.h>
syscallret_t syscall_readlinkat(context_t *, int dirfd, const char *upath, char *ubuffer, size_t ubuffersize) {
syscallret_t syscall_readlinkat(context_t *, int dirfd, char *upath, char *ubuffer, size_t ubuffersize) {
syscallret_t ret = {
.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;
}
file_t *file = NULL;
vnode_t *dirnode = NULL;
@@ -36,9 +45,8 @@ syscallret_t syscall_readlinkat(context_t *, int dirfd, const char *upath, char
size_t bufferlen = strlen(buffer);
size_t copylen = bufferlen > ubuffersize ? ubuffersize : bufferlen;
memcpy(ubuffer, buffer, copylen);
ret.ret = copylen;
ret.errno = usercopy_touser(ubuffer, buffer, copylen);
ret.ret = ret.errno ? -1 : copylen;
cleanup: