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change copy-in routines

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- restrict copy_from_user() to only current process.
- add read_process_vm() to read specified process space.
This commit is contained in:
NAKAMURA Gou
2015-03-03 17:14:38 +09:00
parent a6488adcc1
commit 063fa963c3
3 changed files with 75 additions and 25 deletions
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8
arch/x86/kernel/syscall.c
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@@ -25,7 +25,7 @@
#include <kmalloc.h>
void terminate(int, int, ihk_mc_user_context_t *);
int copy_from_user(struct process *proc, void *dst, const void *src, size_t siz);
int copy_from_user(void *dst, const void *src, size_t siz);
int copy_to_user(struct process *proc, void *dst, const void *src, size_t siz);
long do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact);
@@ -117,7 +117,7 @@ SYSCALL_DECLARE(rt_sigaction)
return -EINVAL;
if(act)
if(copy_from_user(proc, &new_sa.sa, act, sizeof new_sa.sa)){
if(copy_from_user(&new_sa.sa, act, sizeof new_sa.sa)){
goto fault;
}
rc = do_sigaction(sig, act? &new_sa: NULL, oact? &old_sa: NULL);
@@ -152,9 +152,9 @@ SYSCALL_DECLARE(rt_sigreturn)
sigsp = (struct sigsp *)regs->gpr.rsp;
proc->sigmask.__val[0] = sigsp->sigmask;
proc->sigstack.ss_flags = sigsp->ssflags;
if(copy_from_user(proc, regs, &sigsp->regs, sizeof(struct x86_user_context)))
if(copy_from_user(regs, &sigsp->regs, sizeof(struct x86_user_context)))
return rc;
copy_from_user(proc, &rc, &sigsp->sigrc, sizeof(long));
copy_from_user(&rc, &sigsp->sigrc, sizeof(long));
return rc;
}