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fix REQ-19: some syscalls change how to access user space

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This commit is contained in:
Tomoki Shirasawa
2016-03-27 11:43:53 +09:00
parent b0096a2740
commit 1195549f41
2 changed files with 21 additions and 5 deletions
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2
kernel/futex.c
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@ -251,7 +251,7 @@ static int cmpxchg_futex_value_locked(uint32_t __user *uaddr, uint32_t uval, uin
static int get_futex_value_locked(uint32_t *dest, uint32_t *from)
{
/* RIKEN: futexes are always on not swappable pages */
*dest = *from;
*dest = getint_user((int *)from);
return 0;
}

24
kernel/syscall.c
View File

@ -1661,13 +1661,29 @@ SYSCALL_DECLARE(execve)
argv_flat_len = flatten_strings_from_user(-1, (desc->shell_path[0] ?
desc->shell_path : NULL), argv, &argv_flat);
if (argv_flat_len == 0) {
kprintf("ERROR: no argv for executable: %s?\n", filename);
char *kfilename;
int len = strlen_user(filename);
kfilename = kmalloc(len + 1, IHK_MC_AP_NOWAIT);
if(kfilename)
strcpy_from_user(kfilename, filename);
kprintf("ERROR: no argv for executable: %s?\n", kfilename? kfilename: "");
if(kfilename)
kfree(kfilename);
return -EINVAL;
}
envp_flat_len = flatten_strings_from_user(-1, NULL, envp, &envp_flat);
if (envp_flat_len == 0) {
kprintf("ERROR: no envp for executable: %s?\n", filename);
char *kfilename;
int len = strlen_user(filename);
kfilename = kmalloc(len + 1, IHK_MC_AP_NOWAIT);
if(kfilename)
strcpy_from_user(kfilename, filename);
kprintf("ERROR: no envp for executable: %s?\n", kfilename? kfilename: "");
if(kfilename)
kfree(kfilename);
return -EINVAL;
}
@ -1845,7 +1861,7 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
dkprintf("clone_flags & CLONE_PARENT_SETTID: 0x%lX\n",
parent_tidptr);
*(int*)parent_tidptr = new->tid;
setint_user((int*)parent_tidptr, new->tid);
}
if (clone_flags & CLONE_CHILD_CLEARTID) {
@ -4169,7 +4185,7 @@ SYSCALL_DECLARE(exit)
dkprintf("exit clear_child!\n");
*thread->clear_child_tid = 0;
setint_user((int*)thread->clear_child_tid, 0);
barrier();
futex((uint32_t *)thread->clear_child_tid,
FUTEX_WAKE, 1, 0, NULL, 0, 0, 1);