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Date: Mon, 19 Mar 2012 18:19:41 +0100 (CET) From: Jan Engelhardt <jengelh@...ozas.de> To: xemul@...allels.com cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: procfs: introduce the /proc/<pid>/map_files/ directory Hi, I tried out the map_files directory in v3.3, stumbling upon a few things: /proc> echo $$ 1724 /proc> cd 1724/map_files/ /proc/1724/map_files> ls ls: reading directory .: Permission denied /proc/1724/map_files> ls -dl . dr-x------ 2 jengelh users 0 Mar 19 12:54 . By all means, I have the permission - according to stat. Also, not all mappings - in particular, anonymous mappings - seem to be represented: 00400000-0049b000 r-xp 00000000 08:02 10425 /bin/ba 0069a000-0069b000 r--p 0009a000 08:02 10425 /bin/ba 0069b000-0069f000 rw-p 0009b000 08:02 10425 /bin/ba 0069f000-006a9000 rw-p 00000000 00:00 0 01a90000-01bf8000 rw-p 00000000 00:00 0 [heap] 7f87eb3be000-7f87eb559000 r-xp 00000000 08:02 980 /lib64/ 7f87eb559000-7f87eb758000 ---p 0019b000 08:02 980 /lib64/ 7f87eb758000-7f87eb75c000 r--p 0019a000 08:02 980 /lib64/ 7f87eb75c000-7f87eb75e000 rw-p 0019e000 08:02 980 /lib64/ 7f87eb75e000-7f87eb762000 rw-p 00000000 00:00 0 [...] 7f87ebffd000-7f87ebffe000 rw-p 00021000 08:02 71 /lib64/ld-2.15.so 7f87ebffe000-7f87ebfff000 rw-p 00000000 00:00 0 7fffb9f1e000-7fffb9f3f000 rw-p 00000000 00:00 0 [stack] 7fffb9fb5000-7fffb9fb6000 r-xp 00000000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall] /proc/1724/map_files # ls -alog total 0 dr-x------ 2 0 Mar 19 12:54 . dr-xr-xr-x 9 0 Mar 19 12:54 .. lr-------- 1 64 Mar 19 12:54 400000-49b000 -> /bin/bash lr-------- 1 64 Mar 19 12:54 69a000-69b000 -> /bin/bash lr-------- 1 64 Mar 19 12:54 69b000-69f000 -> /bin/bash lr-------- 1 64 Mar 19 12:54 7f87eb3be000-7f87eb559000 -> /lib64/libc-2.15.so lr-------- 1 64 Mar 19 12:54 7f87eb559000-7f87eb758000 -> /lib64/libc-2.15.so lr-------- 1 64 Mar 19 12:54 7f87eb758000-7f87eb75c000 -> /lib64/libc-2.15.so lr-------- 1 64 Mar 19 12:54 7f87eb75c000-7f87eb75e000 -> /lib64/libc-2.15.so lr-------- 1 64 Mar 19 12:54 7f87eb762000-7f87eb764000 -> /lib64/libdl-2.15.so lr-------- 1 64 Mar 19 12:54 7f87eb764000-7f87eb964000 -> /lib64/libdl-2.15.so lr-------- 1 64 Mar 19 12:54 7f87eb964000-7f87eb965000 -> /lib64/libdl-2.15.so lr-------- 1 64 Mar 19 12:54 7f87eb965000-7f87eb966000 -> /lib64/libdl-2.15.so lr-------- 1 64 Mar 19 12:54 7f87eb966000-7f87eb98f000 -> /lib64/libtinfo.so.5.9 lr-------- 1 64 Mar 19 12:54 7f87eb98f000-7f87ebb8e000 -> /lib64/libtinfo.so.5.9 lr-------- 1 64 Mar 19 12:54 7f87ebb8e000-7f87ebb92000 -> /lib64/libtinfo.so.5.9 lr-------- 1 64 Mar 19 12:54 7f87ebb92000-7f87ebb97000 -> /lib64/libtinfo.so.5.9 lr-------- 1 64 Mar 19 12:54 7f87ebb98000-7f87ebbd3000 -> /lib64/libreadline.so.6.2 lr-------- 1 64 Mar 19 12:54 7f87ebbd3000-7f87ebdd3000 -> /lib64/libreadline.so.6.2 lr-------- 1 64 Mar 19 12:54 7f87ebdd3000-7f87ebdd5000 -> /lib64/libreadline.so.6.2 lr-------- 1 64 Mar 19 12:54 7f87ebdd5000-7f87ebddb000 -> /lib64/libreadline.so.6.2 lr-------- 1 64 Mar 19 12:54 7f87ebddc000-7f87ebdfd000 -> /lib64/ld-2.15.so lr-------- 1 64 Mar 19 12:54 7f87ebffc000-7f87ebffd000 -> /lib64/ld-2.15.so lr-------- 1 64 Mar 19 12:54 7f87ebffd000-7f87ebffe000 -> /lib64/ld-2.15.so Having symlinks into anonmaps would provide for an interesting type of debug/insight without having to resort to ptracting, just as /proc/X/fd/Y is when the file behind Y is nlink=0. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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