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Fix the ogetkerninfo() syscall handling of sizes for

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KINFO_BSDI_SYSINFO.  This supposedly fixes Netscape 3.0.4 (bsdi binary)
on -current.  (and is also applicable to RELENG_4)

PR:		25476
Submitted by:	Philipp Mergenthaler <un1i@rz.uni-karlsruhe.de>
This commit is contained in:
Peter Wemm 2001-08-29 11:47:53 +00:00
parent edecdda7b9
commit df55753880
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=82494
1 changed files with 12 additions and 10 deletions
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22
sys/kern/kern_sysctl.c
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@ -1237,6 +1237,7 @@ ogetkerninfo(struct proc *p, struct getkerninfo_args *uap)
{
int error, name[6];
size_t size;
u_int needed = 0;
switch (uap->op & 0xff00) {
@ -1300,16 +1301,15 @@ ogetkerninfo(struct proc *p, struct getkerninfo_args *uap)
* this is pretty crude, but it's just enough for uname()
* from BSDI's 1.x libc to work.
*
* In particular, it doesn't return the same results when
* the supplied buffer is too small. BSDI's version apparently
* will return the amount copied, and set the *size to how
* much was needed. The emulation framework here isn't capable
* of that, so we just set both to the amount copied.
* BSDI's 2.x product apparently fails with ENOMEM in this
* scenario.
* *size gives the size of the buffer before the call, and
* the amount of data copied after a successful call.
* If successful, the return value is the amount of data
* available, which can be larger than *size.
*
* BSDI's 2.x product apparently fails with ENOMEM if *size
* is too small.
*/
u_int needed;
u_int left;
char *s;
@ -1332,13 +1332,15 @@ ogetkerninfo(struct proc *p, struct getkerninfo_args *uap)
needed = sizeof(bsdi_si) + (s - bsdi_strings);
if (uap->where == NULL) {
if ((uap->where == NULL) || (uap->size == NULL)) {
/* process is asking how much buffer to supply.. */
size = needed;
error = 0;
break;
}
if ((error = copyin(uap->size, &size, sizeof(size))) != 0)
break;
/* if too much buffer supplied, trim it down */
if (size > needed)
@ -1364,7 +1366,7 @@ ogetkerninfo(struct proc *p, struct getkerninfo_args *uap)
}
if (error)
return (error);
p->p_retval[0] = size;
p->p_retval[0] = needed ? needed : size;
if (uap->size)
error = copyout((caddr_t)&size, (caddr_t)uap->size,
sizeof(size));