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copyin tests: Use the KERN_PROC_VM_LAYOUT sysctl to fetch layout info

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... rather than using the KERN_PROC_PS_STRINGS value to derive the top
of the user address space.

Reviewed by:	kib
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D33708
This commit is contained in:
Mark Johnston 2022-01-17 11:43:43 -05:00
parent 3ce04aca49
commit 6393594b03
1 changed files with 7 additions and 12 deletions
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19
tests/sys/kern/kern_copyin.c
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@ -33,6 +33,8 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/exec.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
@ -74,27 +76,20 @@ copyin_checker2(uintptr_t uaddr)
static uintptr_t
get_maxuser_address(void)
{
struct kinfo_vm_layout kvm;
size_t len;
uintptr_t psstrings;
int error, mib[4];
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PS_STRINGS;
mib[2] = KERN_PROC_VM_LAYOUT;
mib[3] = getpid();
len = sizeof(psstrings);
error = sysctl(mib, nitems(mib), &psstrings, &len, NULL, 0);
len = sizeof(kvm);
error = sysctl(mib, nitems(mib), &kvm, &len, NULL, 0);
if (error != 0)
return (0);
if (psstrings == PS_STRINGS_LA57)
return (VM_MAXUSER_ADDRESS_LA57);
if (psstrings == PS_STRINGS_LA48)
return (VM_MAXUSER_ADDRESS_LA48);
/* AMD LA48 with clipped UVA */
if (psstrings == PS_STRINGS_LA48 - PAGE_SIZE)
return (VM_MAXUSER_ADDRESS_LA48 - PAGE_SIZE);
return (0);
return (kvm.kvm_max_user_addr);
}
#endif