c - about the /proc/xx/map and the vm_area_struct -



c - about the /proc/xx/map and the vm_area_struct -

the kernel module code:

static int __init module(void) { struct pid *current_pid; struct task_struct *current_task; struct mm_struct *mymm; struct vm_area_struct *pos = null; current_pid = find_vpid(7887); current_task = pid_task(current_pid, pidtype_pid); mymm = current_task->mm; for(pos = mymm->mmap; pos; pos = pos->vm_next) { printk("0x%hx-0x%hx\t%ld\t", pos->vm_start, pos->vm_end,pos->rb_subtree_gap); if(pos->vm_flags & vm_read) { printk("r"); } else { printk("-"); } if(pos->vm_flags & vm_write) { printk("w"); } else { printk("-"); } if(pos->vm_flags & vm_exec) { printk("x"); } else { printk("-"); } printk("\n"); } homecoming 0; } static void __exit rmodule(void) { printk(kern_alert"goodbye,world\n"); } module_init(module); module_exit(rmodule);

the result:

oct 9 18:57:43 shui kernel: [14625.861352] 0x400000-0x401000 4194304 r-x oct 9 18:57:43 shui kernel: [14625.861366] 0x600000-0x601000 273183399936 r-- oct 9 18:57:43 shui kernel: [14625.861373] 0x601000-0x602000 0 rw- oct 9 18:57:43 shui kernel: [14625.861379] 0x3f9b600000-0x3f9b620000 273183399936 r-x oct 9 18:57:43 shui kernel: [14625.861386] 0x3f9b820000-0x3f9b821000 140214666838016 r-- oct 9 18:57:43 shui kernel: [14625.861391] 0x3f9b821000-0x3f9b822000 0 rw- oct 9 18:57:43 shui kernel: [14625.861397] 0x3f9b822000-0x3f9b823000 0 rw- oct 9 18:57:43 shui kernel: [14625.861403] 0x3f9ba00000-0x3f9bbad000 1953792 r-x oct 9 18:57:43 shui kernel: [14625.861408] 0x3f9bbad000-0x3f9bdad000 0 --- oct 9 18:57:43 shui kernel: [14625.861414] 0x3f9bdad000-0x3f9bdb1000 140214666838016 r-- oct 9 18:57:43 shui kernel: [14625.861419] 0x3f9bdb1000-0x3f9bdb3000 0 rw- oct 9 18:57:43 shui kernel: [14625.861425] 0x3f9bdb3000-0x3f9bdb8000 140214666838016 rw- oct 9 18:57:43 shui kernel: [14625.861431] 0x7fc5e1444000-0x7fc5e1447000 140214666838016 rw- oct 9 18:57:43 shui kernel: [14625.861436] 0x7fc5e146f000-0x7fc5e1470000 140214666838016 rw- oct 9 18:57:43 shui kernel: [14625.861442] 0x7fffe4c32000-0x7fffe4c54000 249166569472 rw- oct 9 18:57:43 shui kernel: [14625.861448] 0x7fffe4d79000-0x7fffe4d7b000 1200128 r-x

but utilize cat /proc/7887/maps:

shui @ kernel @ 19:00]$ cat /proc/7887/maps 00400000-00401000 r-xp 00000000 00:20 1826951 /tmp/a.out 00600000-00601000 r--p 00000000 00:20 1826951 /tmp/a.out 00601000-00602000 rw-p 00001000 00:20 1826951 /tmp/a.out 3f9b600000-3f9b620000 r-xp 00000000 fd:01 2228400 /usr/lib64 /ld-2.16.so 3f9b820000-3f9b821000 r--p 00020000 fd:01 2228400 /usr/lib64/ld-2.16.so 3f9b821000-3f9b822000 rw-p 00021000 fd:01 2228400 /usr/lib64/ld-2.16.so 3f9b822000-3f9b823000 rw-p 00000000 00:00 0 3f9ba00000-3f9bbad000 r-xp 00000000 fd:01 2228403 /usr/lib64/libc-2.16.so 3f9bbad000-3f9bdad000 ---p 001ad000 fd:01 2228403 /usr/lib64/libc-2.16.so 3f9bdad000-3f9bdb1000 r--p 001ad000 fd:01 2228403 /usr/lib64/libc-2.16.so 3f9bdb1000-3f9bdb3000 rw-p 001b1000 fd:01 2228403 /usr/lib64/libc-2.16.so 3f9bdb3000-3f9bdb8000 rw-p 00000000 00:00 0 7fc5e1444000-7fc5e1447000 rw-p 00000000 00:00 0 7fc5e146f000-7fc5e1470000 rw-p 00000000 00:00 0 7fffe4c33000-7fffe4c54000 rw-p 00000000 00:00 0 [stack] 7fffe4d79000-7fffe4d7b000 r-xp 00000000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]

the vm_area_struct stack address 7fffe4c32000, maps 7fffe4c33000, different this? , vsyscall why donot printf on vm_area_struct ?

it normal, linux kernel uses stack guard , procfs not show page.

see function show_map_vma in fs/proc/task_mmu.c

c linux linux-kernel kernel

Comments

Post a Comment

Popular posts from this blog

xslt - DocBook 5 to PDF transform failing with error: "fo:flow" is missing child elements. Required content model: marker* -

xslt - DocBook 5 to PDF transform failing with error: "fo:flow" is missing child elements. Required content model: marker* - i've inherited doc publishing process takes docbook , builds html , pdf output, using apache fop both. project had been started, never completed. lots of tweaking, i've able of doc sets build (20+), except handful, , fail severe code 1 of these 2 conditions: "fo:flow" missing kid elements. required content model: marker* "fo:block" not valid kid of "fo:root" the xml output comes out of docbook , docbook-fop checks out well-formed. the fop error in 1 book, "endecagloss", example, points end of string: <fo:flow flow-name="xsl-region-body" start-indent="4pc" end-indent="0pt"/> here’s log output in case: [java] severe: javax.xml.transform.transformerexception: file:/scratch/publishing/hudson/jobs/build-main-endeca-documentation/workspace/serverdoc/w...
Read more

mediawiki - How do I insert tables inside infoboxes on Wikia pages? -

mediawiki - How do I insert tables inside infoboxes on Wikia pages? - i want insert tables in infoboxes. example, have proteinbox i've developed using infobox template (http://health-and-medicine.wikia.com/wiki/template:proteinbox), , fasta field big fit comfortably in proteinbox. hence collapsible table within box. this tried: {{infobox | row 1 = {| class = "mw-collapsible mw-collapsed wikitable" |- | <!-- table content --> |} }} your problem is, putting nested table within template. pipe characters ( | ) in table syntax collides pipe usage in templates. the commonly used hack around create template called template:! , containing pipe character, , utilize when need set tables, parser functions or other stuff using pipe characters, within templates. table (with every | replaced {{!}} ): {{{!}} {{!}}- {{!}} a1 {{!}} b1 {{!}}- {{!}} a2 {{!}} b2 {{!}}} ...the equivalent of {| |- | a1 | b1 |- | a2 | b2 |} furthermore, hav...
Read more

Local Service User Logged into Windows -

Local Service User Logged into Windows - i created windows service tracks app server user connected through load balancer. it retrieves user logged windows on machine, cross references active directory (ad) business relationship homecoming first name, lastly name , e-mail (for notification through website created project) there 1 scheme on network users remote system, vista system, reason returning values "local service" logged machine, it's weird , security guys impossible "local service" business relationship logged windows. here how user logged windows managementscope ms = new managementscope("\\\\.\\root\\cimv2"); objectquery query = new objectquery("select * win32_computersystem"); managementobjectsearcher searcher = new managementobjectsearcher(ms, query); foreach (managementobject mo in searcher.get()) { _username = mo["username"].tostring(); } // remove domain part username string[] usernameparts = _...
Read more