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Change the linprocfs <pid>/maps and procfs <pid>/map handlers to use

Browse Source 
sbuf instead of doing uiomove. This allows for reads from non-zero
offsets to work.

Patch is forward-ported des@' one, and was adopted to current code
by dchagin@ and me.

Reviewed by:	des (linprocfs part)
PR:	kern/101453
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2008-12-08 12:34:52 +00:00
parent 118d0afa28
commit 5a66e0259b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=185765
2 changed files with 51 additions and 16 deletions
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30
sys/compat/linprocfs/linprocfs.c
View File

@ -876,10 +876,12 @@ static int
linprocfs_doprocmaps(PFS_FILL_ARGS)
{
vm_map_t map = &p->p_vmspace->vm_map;
vm_map_entry_t entry;
vm_map_entry_t entry, tmp_entry;
vm_object_t obj, tobj, lobj;
vm_offset_t saved_end;
vm_offset_t e_start, e_end;
vm_ooffset_t off = 0;
vm_prot_t e_prot;
unsigned int last_timestamp;
char *name = "", *freename = NULL;
ino_t ino;
int ref_count, shadow_count, flags;
@ -905,7 +907,9 @@ linprocfs_doprocmaps(PFS_FILL_ARGS)
freename = NULL;
if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
continue;
saved_end = entry->end;
e_prot = entry->protection;
e_start = entry->start;
e_end = entry->end;
obj = entry->object.vm_object;
for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) {
VM_OBJECT_LOCK(tobj);
@ -913,6 +917,8 @@ linprocfs_doprocmaps(PFS_FILL_ARGS)
VM_OBJECT_UNLOCK(lobj);
lobj = tobj;
}
last_timestamp = map->timestamp;
vm_map_unlock_read(map);
ino = 0;
if (lobj) {
off = IDX_TO_OFF(lobj->size);
@ -950,10 +956,10 @@ linprocfs_doprocmaps(PFS_FILL_ARGS)
*/
error = sbuf_printf(sb,
"%08lx-%08lx %s%s%s%s %08lx %02x:%02x %lu%s%s\n",
(u_long)entry->start, (u_long)entry->end,
(entry->protection & VM_PROT_READ)?"r":"-",
(entry->protection & VM_PROT_WRITE)?"w":"-",
(entry->protection & VM_PROT_EXECUTE)?"x":"-",
(u_long)e_start, (u_long)e_end,
(e_prot & VM_PROT_READ)?"r":"-",
(e_prot & VM_PROT_WRITE)?"w":"-",
(e_prot & VM_PROT_EXECUTE)?"x":"-",
"p",
(u_long)off,
0,
@ -968,6 +974,16 @@ linprocfs_doprocmaps(PFS_FILL_ARGS)
error = 0;
break;
}
vm_map_lock_read(map);
if (last_timestamp + 1 != map->timestamp) {
/*
* Look again for the entry because the map was
* modified while it was unlocked. Specifically,
* the entry may have been clipped, merged, or deleted.
*/
vm_map_lookup_entry(map, e_end - 1, &tmp_entry);
entry = tmp_entry;
}
}
vm_map_unlock_read(map);

37
sys/fs/procfs/procfs_map.c
View File

@ -84,9 +84,10 @@ procfs_doprocmap(PFS_FILL_ARGS)
{
int error, vfslocked;
vm_map_t map = &p->p_vmspace->vm_map;
vm_map_entry_t entry;
vm_map_entry_t entry, tmp_entry;
struct vnode *vp;
char *fullpath, *freepath;
unsigned int last_timestamp;
#ifdef COMPAT_IA32
int wrap32 = 0;
#endif
@ -113,13 +114,19 @@ procfs_doprocmap(PFS_FILL_ARGS)
entry = entry->next) {
vm_object_t obj, tobj, lobj;
int ref_count, shadow_count, flags;
vm_offset_t addr;
vm_offset_t e_start, e_end, addr;
int resident, privateresident;
char *type;
vm_eflags_t e_eflags;
vm_prot_t e_prot;
if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
continue;
e_eflags = entry->eflags;
e_prot = entry->protection;
e_start = entry->start;
e_end = entry->end;
privateresident = 0;
obj = entry->object.vm_object;
if (obj != NULL) {
@ -143,11 +150,13 @@ procfs_doprocmap(PFS_FILL_ARGS)
VM_OBJECT_UNLOCK(lobj);
lobj = tobj;
}
last_timestamp = map->timestamp;
vm_map_unlock_read(map);
freepath = NULL;
fullpath = "-";
if (lobj) {
switch(lobj->type) {
switch (lobj->type) {
default:
case OBJT_DEFAULT:
type = "default";
@ -193,19 +202,19 @@ procfs_doprocmap(PFS_FILL_ARGS)
*/
error = sbuf_printf(sb,
"0x%lx 0x%lx %d %d %p %s%s%s %d %d 0x%x %s %s %s %s\n",
(u_long)entry->start, (u_long)entry->end,
(u_long)e_start, (u_long)e_end,
resident, privateresident,
#ifdef COMPAT_IA32
wrap32 ? NULL : obj, /* Hide 64 bit value */
#else
obj,
#endif
(entry->protection & VM_PROT_READ)?"r":"-",
(entry->protection & VM_PROT_WRITE)?"w":"-",
(entry->protection & VM_PROT_EXECUTE)?"x":"-",
(e_prot & VM_PROT_READ)?"r":"-",
(e_prot & VM_PROT_WRITE)?"w":"-",
(e_prot & VM_PROT_EXECUTE)?"x":"-",
ref_count, shadow_count, flags,
(entry->eflags & MAP_ENTRY_COW)?"COW":"NCOW",
(entry->eflags & MAP_ENTRY_NEEDS_COPY)?"NC":"NNC",
(e_eflags & MAP_ENTRY_COW)?"COW":"NCOW",
(e_eflags & MAP_ENTRY_NEEDS_COPY)?"NC":"NNC",
type, fullpath);
if (freepath != NULL)
@ -215,6 +224,16 @@ procfs_doprocmap(PFS_FILL_ARGS)
error = 0;
break;
}
vm_map_lock_read(map);
if (last_timestamp + 1 != map->timestamp) {
/*
* Look again for the entry because the map was
* modified while it was unlocked. Specifically,
* the entry may have been clipped, merged, or deleted.
*/
vm_map_lookup_entry(map, e_end - 1, &tmp_entry);
entry = tmp_entry;
}
}
vm_map_unlock_read(map);
return (error);