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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/renameat.c
+17 -8
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@@ -3,31 +3,40 @@
#include <string.h>
#include <logging.h>
syscallret_t syscall_renameat(context_t *context, int olddirfd, const char *uoldpath, int newdirfd, const char *unewpath, unsigned int flags) {
syscallret_t syscall_renameat(context_t *context, int olddirfd, char *uoldpath, int newdirfd, char *unewpath, unsigned int flags) {
syscallret_t ret = {
.ret = -1
};
__assert(flags == 0);
size_t oldpathlen;
size_t newpathlen;
if (usercopy_strlen(uoldpath, &oldpathlen) || usercopy_strlen(unewpath, &newpathlen)) {
ret.errno = EFAULT;
return ret;
}
char *oldcomponent = NULL;
char *newcomponent = NULL;
char *oldpath = alloc(strlen(uoldpath) + 1);
char *oldpath = alloc(oldpathlen + 1);
if (oldpath == NULL) {
ret.errno = ENOMEM;
return ret;
}
char *newpath = alloc(strlen(unewpath) + 1);
char *newpath = alloc(newpathlen + 1);
if (newpath == NULL) {
free(oldpath);
ret.errno = ENOMEM;
return ret;
}
// TODO safe strcopy
strcpy(oldpath, uoldpath);
strcpy(newpath, unewpath);
if (usercopy_fromuser(oldpath, uoldpath, oldpathlen) || usercopy_fromuser(newpath, unewpath, newpathlen)) {
ret.errno = EFAULT;
return ret;
}
vnode_t *olddirnode = NULL;
file_t *oldfile = NULL;
@@ -45,8 +54,8 @@ syscallret_t syscall_renameat(context_t *context, int olddirfd, const char *uold
if (ret.errno)
goto cleanup;
oldcomponent = alloc(strlen(oldpath));
newcomponent = alloc(strlen(newpath));
oldcomponent = alloc(strlen(oldpath) + 1);
newcomponent = alloc(strlen(newpath) + 1);
if (oldcomponent == NULL && newcomponent == NULL)
goto cleanup;