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Kernel: delivermsg improvements

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. make arch-independent, and local to proc.c, reduce code duplication
    . make vm_suspend public but unduplicated in proc.c
    . ask VM for handling once, 2nd time SIGSEGV process
    . remove debug printfs
    . test case for bogus sendrec() address argument

Change-Id: I3893758910c01de60b8fe3e50edd594296a0b73e
This commit is contained in:
Ben Gras 2015-06-29 00:07:29 +02:00 committed by David van Moolenbroek
parent 36f477c20e
commit 8bab0dfa2a
5 changed files with 69 additions and 120 deletions
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58
minix/kernel/arch/earm/memory.c
View File

@ -394,35 +394,6 @@ size_t vm_lookup_range(const struct proc *proc, vir_bytes vir_addr,
return MIN(bytes, len);
}
/*===========================================================================*
* vm_suspend *
*===========================================================================*/
static void vm_suspend(struct proc *caller, const struct proc *target,
const vir_bytes linaddr, const vir_bytes len, const int type,
const int writeflag)
{
/* This range is not OK for this process. Set parameters
* of the request and notify VM about the pending request.
*/
assert(!RTS_ISSET(caller, RTS_VMREQUEST));
assert(!RTS_ISSET(target, RTS_VMREQUEST));
RTS_SET(caller, RTS_VMREQUEST);
caller->p_vmrequest.req_type = VMPTYPE_CHECK;
caller->p_vmrequest.target = target->p_endpoint;
caller->p_vmrequest.params.check.start = linaddr;
caller->p_vmrequest.params.check.length = len;
caller->p_vmrequest.params.check.writeflag = writeflag;
caller->p_vmrequest.type = type;
/* Connect caller on vmrequest wait queue. */
if(!(caller->p_vmrequest.nextrequestor = vmrequest))
if(OK != send_sig(VM_PROC_NR, SIGKMEM))
panic("send_sig failed");
vmrequest = caller;
}
/*===========================================================================*
* vm_check_range *
*===========================================================================*/
@ -449,35 +420,6 @@ int vm_check_range(struct proc *caller, struct proc *target,
return VMSUSPEND;
}
/*===========================================================================*
* delivermsg *
*===========================================================================*/
void delivermsg(struct proc *rp)
{
int r = OK;
assert(rp->p_misc_flags & MF_DELIVERMSG);
assert(rp->p_delivermsg.m_source != NONE);
if (copy_msg_to_user(&rp->p_delivermsg,
(message *) rp->p_delivermsg_vir)) {
printf("WARNING wrong user pointer 0x%08lx from "
"process %s / %d\n",
rp->p_delivermsg_vir,
rp->p_name,
rp->p_endpoint);
r = EFAULT;
}
/* Indicate message has been delivered; address is 'used'. */
rp->p_delivermsg.m_source = NONE;
rp->p_misc_flags &= ~MF_DELIVERMSG;
if(!(rp->p_misc_flags & MF_CONTEXT_SET)) {
rp->p_reg.retreg = r;
}
}
/*===========================================================================*
* vmmemset *
*===========================================================================*/

61
minix/kernel/arch/i386/memory.c
View File

@ -421,37 +421,6 @@ size_t vm_lookup_range(const struct proc *proc, vir_bytes vir_addr,
return MIN(bytes, len);
}
/*===========================================================================*
* vm_suspend *
*===========================================================================*/
static void vm_suspend(struct proc *caller, const struct proc *target,
const vir_bytes linaddr, const vir_bytes len, const int type,
const int writeflag)
{
/* This range is not OK for this process. Set parameters
* of the request and notify VM about the pending request.
*/
assert(!RTS_ISSET(caller, RTS_VMREQUEST));
assert(!RTS_ISSET(target, RTS_VMREQUEST));
RTS_SET(caller, RTS_VMREQUEST);
assert(caller->p_endpoint != VM_PROC_NR);
caller->p_vmrequest.req_type = VMPTYPE_CHECK;
caller->p_vmrequest.target = target->p_endpoint;
caller->p_vmrequest.params.check.start = linaddr;
caller->p_vmrequest.params.check.length = len;
caller->p_vmrequest.params.check.writeflag = writeflag;
caller->p_vmrequest.type = type;
/* Connect caller on vmrequest wait queue. */
if(!(caller->p_vmrequest.nextrequestor = vmrequest))
if(OK != send_sig(VM_PROC_NR, SIGKMEM))
panic("send_sig failed");
vmrequest = caller;
}
/*===========================================================================*
* vm_check_range *
*===========================================================================*/
@ -478,36 +447,6 @@ int vm_check_range(struct proc *caller, struct proc *target,
return VMSUSPEND;
}
/*===========================================================================*
* delivermsg *
*===========================================================================*/
void delivermsg(struct proc *rp)
{
int r = OK;
assert(rp->p_misc_flags & MF_DELIVERMSG);
assert(rp->p_delivermsg.m_source != NONE);
if (copy_msg_to_user(&rp->p_delivermsg,
(message *) rp->p_delivermsg_vir)) {
printf("WARNING wrong user pointer 0x%08lx from "
"process %s / %d\n",
rp->p_delivermsg_vir,
rp->p_name,
rp->p_endpoint);
cause_sig(rp->p_nr, SIGSEGV);
r = EFAULT;
}
/* Indicate message has been delivered; address is 'used'. */
rp->p_delivermsg.m_source = NONE;
rp->p_misc_flags &= ~MF_DELIVERMSG;
if(!(rp->p_misc_flags & MF_CONTEXT_SET)) {
rp->p_reg.retreg = r;
}
}
#if 0
static char *flagstr(u32_t e, const int dir)
{

65
minix/kernel/proc.c
View File

@ -231,6 +231,71 @@ static void idle(void)
*/
}
/*===========================================================================*
* vm_suspend *
*===========================================================================*/
void vm_suspend(struct proc *caller, const struct proc *target,
const vir_bytes linaddr, const vir_bytes len, const int type,
const int writeflag)
{
/* This range is not OK for this process. Set parameters
* of the request and notify VM about the pending request.
*/
assert(!RTS_ISSET(caller, RTS_VMREQUEST));
assert(!RTS_ISSET(target, RTS_VMREQUEST));
RTS_SET(caller, RTS_VMREQUEST);
caller->p_vmrequest.req_type = VMPTYPE_CHECK;
caller->p_vmrequest.target = target->p_endpoint;
caller->p_vmrequest.params.check.start = linaddr;
caller->p_vmrequest.params.check.length = len;
caller->p_vmrequest.params.check.writeflag = writeflag;
caller->p_vmrequest.type = type;
/* Connect caller on vmrequest wait queue. */
if(!(caller->p_vmrequest.nextrequestor = vmrequest))
if(OK != send_sig(VM_PROC_NR, SIGKMEM))
panic("send_sig failed");
vmrequest = caller;
}
/*===========================================================================*
* delivermsg *
*===========================================================================*/
static void delivermsg(struct proc *rp)
{
assert(!RTS_ISSET(rp, RTS_VMREQUEST));
assert(rp->p_misc_flags & MF_DELIVERMSG);
assert(rp->p_delivermsg.m_source != NONE);
if (copy_msg_to_user(&rp->p_delivermsg,
(message *) rp->p_delivermsg_vir)) {
if(rp->p_misc_flags & MF_MSGFAILED) {
/* 2nd consecutive failure means this won't succeed */
printf("WARNING wrong user pointer 0x%08lx from "
"process %s / %d\n",
rp->p_delivermsg_vir,
rp->p_name,
rp->p_endpoint);
cause_sig(rp->p_nr, SIGSEGV);
} else {
/* 1st failure means we have to ask VM to handle it */
vm_suspend(rp, rp, rp->p_delivermsg_vir,
sizeof(message), VMSTYPE_DELIVERMSG, 1);
rp->p_misc_flags |= MF_MSGFAILED;
}
} else {
/* Indicate message has been delivered; address is 'used'. */
rp->p_delivermsg.m_source = NONE;
rp->p_misc_flags &= ~(MF_DELIVERMSG|MF_MSGFAILED);
if(!(rp->p_misc_flags & MF_CONTEXT_SET)) {
rp->p_reg.retreg = OK;
}
}
}
/*===========================================================================*
* switch_to_user *
*===========================================================================*/

1
minix/kernel/proc.h
View File

@ -255,6 +255,7 @@ struct proc {
because of VM modifying the sender's address
space*/
#define MF_STEP 0x40000 /* Single-step process */
#define MF_MSGFAILED 0x80000
/* Magic process table addresses. */
#define BEG_PROC_ADDR (&proc[0])

4
minix/kernel/proto.h
View File

@ -59,6 +59,9 @@ int has_pending_notify(struct proc * caller, int src_p);
int has_pending_asend(struct proc * caller, int src_p);
void unset_notify_pending(struct proc * caller, int src_p);
int mini_notify(const struct proc *src, endpoint_t dst);
void vm_suspend(struct proc *caller, const struct proc *target,
const vir_bytes linaddr, const vir_bytes len, const int type,
const int writeflag);
void enqueue(struct proc *rp);
void dequeue(struct proc *rp);
void switch_to_user(void);
@ -215,7 +218,6 @@ int vm_lookup(const struct proc *proc, vir_bytes virtual, phys_bytes
*result, u32_t *ptent);
size_t vm_lookup_range(const struct proc *proc,
vir_bytes vir_addr, phys_bytes *phys_addr, size_t bytes);
void delivermsg(struct proc *target);
void arch_do_syscall(struct proc *proc);
int arch_phys_map(int index, phys_bytes *addr, phys_bytes *len, int
*flags);