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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/mount.c
+41 -13
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@@ -4,24 +4,36 @@
#include <kernel/vfs.h>
#include <logging.h>
syscallret_t syscall_mount(context_t *context, const char *ubacking, const char *umountpoint, const char *ufs, unsigned long flags, void *data) {
static void freeptrs(void *a, void *b, void *c) {
if (a)
free(a);
if (b)
free (b);
if (c)
free (c);
}
syscallret_t syscall_mount(context_t *context, char *ubacking, char *umountpoint, char *ufs, unsigned long flags, void *data) {
syscallret_t ret = {
.ret = -1
};
__assert(flags == 0);
if ((void *)ubacking > USERSPACE_END || (void *)umountpoint > USERSPACE_END || (void *)ufs > USERSPACE_END) {
size_t mountpointlen, fslen;
if (usercopy_strlen(umountpoint, &mountpointlen) || usercopy_strlen(ufs, &fslen)) {
ret.errno = EFAULT;
return ret;
}
ret.errno = ENOMEM;
char *mountpoint = alloc(strlen(umountpoint) + 1);
if (mountpoint == NULL) {
char *mountpoint = alloc(mountpointlen + 1);
if (mountpoint == NULL)
return ret;
}
char *fs = alloc(strlen(ufs) + 1);
char *fs = alloc(fslen + 1);
if (fs == NULL) {
free(mountpoint);
return ret;
@@ -29,16 +41,32 @@ syscallret_t syscall_mount(context_t *context, const char *ubacking, const char
char *backing = NULL;
if (ubacking) {
backing = alloc(strlen(ubacking) + 1);
if (backing == NULL) {
free(mountpoint);
free(fs);
size_t backinglen;
ret.errno = usercopy_strlen(ubacking, &backinglen);
if (ret.errno) {
freeptrs(mountpoint, fs, NULL);
return ret;
}
backing = alloc(backinglen + 1);
if (backing == NULL) {
freeptrs(mountpoint, fs, NULL);
return ret;
}
ret.errno = usercopy_fromuser(backing, ubacking, backinglen);
if (ret.errno) {
freeptrs(backing, mountpoint, fs);
return ret;
}
strcpy(backing, ubacking);
}
strcpy(fs, ufs);
strcpy(mountpoint, umountpoint);
if (usercopy_fromuser(fs, ufs, fslen) || usercopy_fromuser(mountpoint, umountpoint, mountpointlen)) {
ret.errno = EFAULT;
freeptrs(fs, mountpoint, backing);
return ret;
}
vnode_t *backingrefnode = NULL;
if (ubacking)