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Code Issues Releases Activity

proc: Add a sysctl to fetch virtual address space layout info

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This provides information about fixed regions of the target process'
user memory map.

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 11:43:03 -05:00
parent 1811c1e957
commit 3ce04aca49
4 changed files with 111 additions and 0 deletions
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13
sys/compat/freebsd32/freebsd32.h
View File

@ -432,6 +432,19 @@ struct kinfo_sigtramp32 {
uint32_t ksigtramp_spare[4];
};
struct kinfo_vm_layout32 {
uint32_t kvm_min_user_addr;
uint32_t kvm_max_user_addr;
uint32_t kvm_text_addr;
uint32_t kvm_text_size;
uint32_t kvm_data_addr;
uint32_t kvm_data_size;
uint32_t kvm_stack_addr;
uint32_t kvm_stack_size;
int kvm_map_flags;
uint32_t kvm_spare[14];
};
struct kld_file_stat_1_32 {
int version; /* set to sizeof(struct kld_file_stat_1) */
char name[MAXPATHLEN];

78
sys/kern/kern_proc.c
View File

@ -3200,6 +3200,80 @@ sysctl_kern_proc_sigfastblk(SYSCTL_HANDLER_ARGS)
return (error);
}
static int
sysctl_kern_proc_vm_layout(SYSCTL_HANDLER_ARGS)
{
struct kinfo_vm_layout kvm;
struct proc *p;
struct vmspace *vmspace;
int error, *name;
name = (int *)arg1;
if ((u_int)arg2 != 1)
return (EINVAL);
error = pget((pid_t)name[0], PGET_CANDEBUG, &p);
if (error != 0)
return (error);
#ifdef COMPAT_FREEBSD32
if (SV_CURPROC_FLAG(SV_ILP32)) {
if (!SV_PROC_FLAG(p, SV_ILP32)) {
PROC_UNLOCK(p);
return (EINVAL);
}
}
#endif
vmspace = vmspace_acquire_ref(p);
PROC_UNLOCK(p);
memset(&kvm, 0, sizeof(kvm));
kvm.kvm_min_user_addr = vm_map_min(&vmspace->vm_map);
kvm.kvm_max_user_addr = vm_map_max(&vmspace->vm_map);
kvm.kvm_text_addr = (uintptr_t)vmspace->vm_taddr;
kvm.kvm_text_size = vmspace->vm_tsize;
kvm.kvm_data_addr = (uintptr_t)vmspace->vm_daddr;
kvm.kvm_data_size = vmspace->vm_dsize;
kvm.kvm_stack_addr = (uintptr_t)vmspace->vm_maxsaddr;
kvm.kvm_stack_size = vmspace->vm_ssize;
if ((vmspace->vm_map.flags & MAP_WIREFUTURE) != 0)
kvm.kvm_map_flags |= KMAP_FLAG_WIREFUTURE;
if ((vmspace->vm_map.flags & MAP_ASLR) != 0)
kvm.kvm_map_flags |= KMAP_FLAG_ASLR;
if ((vmspace->vm_map.flags & MAP_ASLR_IGNSTART) != 0)
kvm.kvm_map_flags |= KMAP_FLAG_ASLR_IGNSTART;
if ((vmspace->vm_map.flags & MAP_WXORX) != 0)
kvm.kvm_map_flags |= KMAP_FLAG_WXORX;
if ((vmspace->vm_map.flags & MAP_ASLR_STACK) != 0)
kvm.kvm_map_flags |= KMAP_FLAG_ASLR_STACK;
#ifdef COMPAT_FREEBSD32
if (SV_CURPROC_FLAG(SV_ILP32)) {
struct kinfo_vm_layout32 kvm32;
memset(&kvm32, 0, sizeof(kvm32));
kvm32.kvm_min_user_addr = (uint32_t)kvm.kvm_min_user_addr;
kvm32.kvm_max_user_addr = (uint32_t)kvm.kvm_max_user_addr;
kvm32.kvm_text_addr = (uint32_t)kvm.kvm_text_addr;
kvm32.kvm_text_size = (uint32_t)kvm.kvm_text_size;
kvm32.kvm_data_addr = (uint32_t)kvm.kvm_data_addr;
kvm32.kvm_data_size = (uint32_t)kvm.kvm_data_size;
kvm32.kvm_stack_addr = (uint32_t)kvm.kvm_stack_addr;
kvm32.kvm_stack_size = (uint32_t)kvm.kvm_stack_size;
kvm32.kvm_map_flags = kvm.kvm_map_flags;
vmspace_free(vmspace);
error = SYSCTL_OUT(req, &kvm32, sizeof(kvm32));
goto out;
}
#endif
error = SYSCTL_OUT(req, &kvm, sizeof(kvm));
#ifdef COMPAT_FREEBSD32
out:
#endif
vmspace_free(vmspace);
return (error);
}
SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"Process table");
@ -3318,6 +3392,10 @@ static SYSCTL_NODE(_kern_proc, KERN_PROC_SIGFASTBLK, sigfastblk, CTLFLAG_RD |
CTLFLAG_ANYBODY | CTLFLAG_MPSAFE, sysctl_kern_proc_sigfastblk,
"Thread sigfastblock address");
static SYSCTL_NODE(_kern_proc, KERN_PROC_VM_LAYOUT, vm_layout, CTLFLAG_RD |
CTLFLAG_ANYBODY | CTLFLAG_MPSAFE, sysctl_kern_proc_vm_layout,
"Process virtual address space layout info");
int allproc_gen;
/*

1
sys/sys/sysctl.h
View File

@ -1013,6 +1013,7 @@ TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
#define KERN_PROC_CWD 42 /* process current working directory */
#define KERN_PROC_NFDS 43 /* number of open file descriptors */
#define KERN_PROC_SIGFASTBLK 44 /* address of fastsigblk magic word */
#define KERN_PROC_VM_LAYOUT 45 /* virtual address space layout info */
/*
* KERN_IPC identifiers

19
sys/sys/user.h
View File

@ -598,6 +598,25 @@ struct kinfo_sigtramp {
void *ksigtramp_spare[4];
};
#define KMAP_FLAG_WIREFUTURE 0x01 /* all future mappings wil be wired */
#define KMAP_FLAG_ASLR 0x02 /* ASLR is applied to mappings */
#define KMAP_FLAG_ASLR_IGNSTART 0x04 /* ASLR may map into sbrk grow region */
#define KMAP_FLAG_WXORX 0x08 /* W^X mapping policy is enforced */
#define KMAP_FLAG_ASLR_STACK 0x10 /* the stack location is randomized */
struct kinfo_vm_layout {
uintptr_t kvm_min_user_addr;
uintptr_t kvm_max_user_addr;
uintptr_t kvm_text_addr;
size_t kvm_text_size;
uintptr_t kvm_data_addr;
size_t kvm_data_size;
uintptr_t kvm_stack_addr;
size_t kvm_stack_size;
int kvm_map_flags;
uintptr_t kvm_spare[14];
};
#ifdef _KERNEL
/* Flags for kern_proc_out function. */
#define KERN_PROC_NOTHREADS 0x1