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procps/proc/readproc.h
Todd Lewis e500ba6d97 fix uid/gid > 2^31 
This MR revisits a partial fix from 2018. The problem stems from incorrect
handling of unsigned 32-bit uid_ts and gid_ts as signed when values are
large - i.e. when the high bit is set. In that case, pgrep and pkill fail to
identify processes by uid. (They succeed when finding the same processes by
username.) The primary fix for this is to impliment the "FIXME" comment in
proc/readproc.h, the implementation of which allows the removal of the (int)
casts from the partial fix from 2018.

The other fixed code in this MR consists of tests in strict_atol() that
detects and errors out on overflows.

References:
 Merge !146
2021-10-26 18:13:48 +11:00

288 lines
16 KiB
C
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#ifndef PROCPS_PROC_READPROC_H
#define PROCPS_PROC_READPROC_H
// New Interface to Process Table -- PROCTAB Stream (a la Directory streams)
// Copyright 1996 Charles L. Blake.
// Copyright 1998 Michael K. Johnson
// Copyright 1998-2003 Albert Cahalan
// May be distributed under the terms of the
// GNU Library General Public License, a copy of which is provided
// in the file COPYING
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <proc/misc.h>
// the following is development only, forcing display of "[ duplicate ENUM ]" strings
// #define FALSE_THREADS /* set most child string fields to NULL */
// This is to help document a transition from pid to tgid/tid caused
// by the introduction of thread support. It is used in cases where
// neither tgid nor tid seemed correct. (in other words, FIXME)
#define XXXID tid
// Basic data structure which holds all information we can get about a process.
// (unless otherwise specified, fields are read from /proc/#/stat)
//
// Most of it comes from task_struct in linux/sched.h
//
typedef struct proc_t {
int
tid, // (special) task id, the POSIX thread ID (see also: tgid)
ppid; // stat,status pid of parent process
char
state, // stat,status single-char code for process state (S=sleeping)
pad_1, // n/a padding
pad_2, // n/a padding
pad_3; // n/a padding
unsigned long long
utime, // stat user-mode CPU time accumulated by process
stime, // stat kernel-mode CPU time accumulated by process
cutime, // stat cumulative utime of process and reaped children
cstime, // stat cumulative stime of process and reaped children
start_time, // stat start time of process -- seconds since system boot
blkio_tics, // stat time spent waiting for block IO
gtime, // stat guest time of the task in jiffies
cgtime; // stat guest time of the task children in jiffies
int // next 3 fields are NOT filled in by readproc
pcpu, // stat (special) elapsed tics for %CPU usage calculation
maj_delta, // stat (special) major page faults since last update
min_delta; // stat (special) minor page faults since last update
char
// Linux 2.1.7x and up have 64 signals. Allow 64, plus '\0' and padding.
signal[18], // status mask of pending signals
blocked[18], // status mask of blocked signals
sigignore[18], // status mask of ignored signals
sigcatch[18], // status mask of caught signals
_sigpnd[18]; // status mask of PER TASK pending signals
unsigned long
start_code, // stat address of beginning of code segment
end_code, // stat address of end of code segment
start_stack, // stat address of the bottom of stack for the process
kstk_esp, // stat kernel stack pointer
kstk_eip, // stat kernel instruction pointer
wchan, // stat (special) address of kernel wait channel proc is sleeping in
rss, // stat identical to 'resident'
alarm; // stat ?
int
priority, // stat kernel scheduling priority
nice; // stat standard unix nice level of process
unsigned long
// the next 7 members come from /proc/#/statm
size, // statm total virtual memory (as # pages)
resident, // statm resident non-swapped memory (as # pages)
share, // statm shared (mmap'd) memory (as # pages)
trs, // statm text (exe) resident set (as # pages)
lrs, // statm library resident set (always 0 w/ 2.6)
drs, // statm data+stack resident set (as # pages)
dt; // statm dirty pages (always 0 w/ 2.6)
unsigned long
vm_size, // status equals 'size' (as kb)
vm_lock, // status locked pages (as kb)
vm_rss, // status equals 'rss' and/or 'resident' (as kb)
vm_rss_anon, // status the 'anonymous' portion of vm_rss (as kb)
vm_rss_file, // status the 'file-backed' portion of vm_rss (as kb)
vm_rss_shared, // status the 'shared' portion of vm_rss (as kb)
vm_data, // status data only size (as kb)
vm_stack, // status stack only size (as kb)
vm_swap, // status based on linux-2.6.34 "swap ents" (as kb)
vm_exe, // status equals 'trs' (as kb)
vm_lib, // status total, not just used, library pages (as kb)
vsize, // stat number of pages of virtual memory ...
rss_rlim, // stat resident set size limit?
flags, // stat kernel flags for the process
min_flt, // stat number of minor page faults since process start
maj_flt, // stat number of major page faults since process start
cmin_flt, // stat cumulative min_flt of process and child processes
cmaj_flt, // stat cumulative maj_flt of process and child processes
rchar, // io characters read
wchar, // io characters written
syscr, // io number of read I/O operations
syscw, // io number of write I/O operations
read_bytes, // io number of bytes fetched from the storage layer
write_bytes, // io number of bytes sent to the storage layer
cancelled_write_bytes, // io number of bytes truncating pagecache
smap_Rss, // smaps_rollup mapping currently resident in RAM
smap_Pss, // " Rss divided by total processes sharing it
smap_Pss_Anon, // " proportional share of 'anonymous' memory
smap_Pss_File, // " proportional share of 'file' memory
smap_Pss_Shmem, // " proportional share of 'shmem' memory
smap_Shared_Clean, // " unmodified shared memory
smap_Shared_Dirty, // " altered shared memory
smap_Private_Clean, // " unmodified private memory
smap_Private_Dirty, // " altered private memory
smap_Referenced, // " memory marked as referenced/accessed
smap_Anonymous, // " memory not belonging to any file
smap_LazyFree, // " memory marked by madvise(MADV_FREE)
smap_AnonHugePages, // " memory backed by transparent huge pages
smap_ShmemPmdMapped, // " shmem/tmpfs memory backed by huge pages
smap_FilePmdMapped, // " file memory backed by huge pages
smap_Shared_Hugetlb, // " hugetlbfs backed memory *not* counted in Rss/Pss
smap_Private_Hugetlb, // " hugetlbfs backed memory *not* counted in Rss/Pss
smap_Swap, // " swapped would-be-anonymous memory (includes swapped out shmem)
smap_SwapPss, // " the proportional share of 'Swap' (excludes swapped out shmem)
smap_Locked; // " memory amount locked to RAM
char
*environ, // (special) environment as string (/proc/#/environ)
*cmdline, // (special) command line as string (/proc/#/cmdline)
*cgroup, // (special) cgroup as string (/proc/#/cgroup)
*cgname, // (special) name portion of above (if possible)
*supgid, // status supplementary gids as comma delimited str
*supgrp, // supp grp names as comma delimited str, derived from supgid
**environ_v, // (special) environment string vectors (/proc/#/environ)
**cmdline_v, // (special) command line string vectors (/proc/#/cmdline)
**cgroup_v; // (special) cgroup string vectors (/proc/#/cgroup)
char
*euser, // stat(),status effective user name
*ruser, // status real user name
*suser, // status saved user name
*fuser, // status filesystem user name
*rgroup, // status real group name
*egroup, // status effective group name
*sgroup, // status saved group name
*fgroup, // status filesystem group name
*cmd; // stat,status basename of executable file in call to exec(2)
int
rtprio, // stat real-time priority
sched, // stat scheduling class
pgrp, // stat process group id
session, // stat session id
nlwp, // stat,status number of threads, or 0 if no clue
tgid, // (special) thread group ID, the POSIX PID (see also: tid)
tty; // stat full device number of controlling terminal
/* FIXME: int uids & gids should be uid_t or gid_t from pwd.h */
uid_t euid; gid_t egid; // stat(),status effective
uid_t ruid; gid_t rgid; // status real
uid_t suid; gid_t sgid; // status saved
uid_t fuid; gid_t fgid; // status fs (used for file access only)
int
tpgid, // stat terminal process group id
exit_signal, // stat might not be SIGCHLD
processor; // stat current (or most recent?) CPU
int
oom_score, // oom_score (badness for OOM killer)
oom_adj; // oom_adj (adjustment to OOM score)
struct procps_ns ns; // (ns subdir) inode number of namespaces
char
*sd_mach, // n/a systemd vm/container name
*sd_ouid, // n/a systemd session owner uid
*sd_seat, // n/a systemd login session seat
*sd_sess, // n/a systemd login session id
*sd_slice, // n/a systemd slice unit
*sd_unit, // n/a systemd system unit id
*sd_uunit; // n/a systemd user unit id
char
*lxcname, // n/a lxc container name
*exe; // exe executable path + name
int
luid, // loginuid user id at login
autogrp_id, // autogroup autogroup number (id)
autogrp_nice; // autogroup autogroup nice value
} proc_t;
// PROCTAB: data structure holding the persistent information readproc needs
// from openproc(). The setup is intentionally similar to the dirent interface
// and other system table interfaces (utmp+wtmp come to mind).
#define PROCPATHLEN 64 // must hold /proc/2000222000/task/2000222000/cmdline
typedef struct PROCTAB {
DIR *procfs;
// char deBug0[64];
DIR *taskdir; // for threads
// char deBug1[64];
pid_t taskdir_user; // for threads
int(*finder)(struct PROCTAB *__restrict const, proc_t *__restrict const);
proc_t*(*reader)(struct PROCTAB *__restrict const, proc_t *__restrict const);
int(*taskfinder)(struct PROCTAB *__restrict const, const proc_t *__restrict const, proc_t *__restrict const, char *__restrict const);
proc_t*(*taskreader)(struct PROCTAB *__restrict const, proc_t *__restrict const, char *__restrict const);
pid_t *pids; // pids of the procs
uid_t *uids; // uids of procs
int nuid; // cannot really sentinel-terminate unsigned short[]
int i; // generic
unsigned flags;
unsigned u; // generic
void * vp; // generic
char path[PROCPATHLEN]; // must hold /proc/2000222000/task/2000222000/cmdline
unsigned pathlen; // length of string in the above (w/o '\0')
} PROCTAB;
// openproc/readproctab:
//
// Return PROCTAB* / *proc_t[] or NULL on error ((probably) "/proc" cannot be
// opened.) By default readproc will consider all processes as valid to parse
// and return, but not actually fill in the cmdline, environ, and /proc/#/statm
// derived memory fields.
//
// `flags' (a bitwise-or of PROC_* below) modifies the default behavior. The
// "fill" options will cause more of the proc_t to be filled in. The "filter"
// options all use the second argument as the pointer to a list of objects:
// process status', process id's, user id's. The third
// argument is the length of the list (currently only used for lists of user
// id's since uid_t supports no convenient termination sentinel.)
#define PROC_FILLMEM 0x00000001 // read statm
#define PROC_FILLARG 0x00000002 // alloc and fill in `cmdline' vectors
#define PROC_FILLENV 0x00000004 // alloc and fill in `environ' vectors
#define PROC_FILLUSR 0x00000008 // resolve user id number -> user name
#define PROC_FILLGRP 0x00000010 // resolve group id number -> group name
#define PROC_FILLSTATUS 0x00000020 // read status
#define PROC_FILLSTAT 0x00000040 // read stat
#define PROC_FILLCGROUP 0x00000080 // alloc and fill in `cgroup` vectors
#define PROC_FILLOOM 0x00000100 // fill in proc_t oom_score and oom_adj
#define PROC_FILLNS 0x00000200 // fill in proc_t namespace information
#define PROC_FILLSYSTEMD 0x00000400 // fill in proc_t systemd information
#define PROC_FILL_LXC 0x00000800 // fill in proc_t lxcname, if possible
#define PROC_FILL_LUID 0x00001000 // fill in proc_t luid (login user id)
#define PROC_FILL_EXE 0x00002000 // fill in proc_t exe path + pgm name
#define PROC_FILLIO 0x00004000 // fill in proc_t io information
#define PROC_FILLSMAPS 0x00008000 // fill in proc_t smaps_rollup stuff
// consider only processes with one of the passed:
#define PROC_PID 0x00010000 // process id numbers ( 0 terminated )
#define PROC_UID 0x00020000 // user id numbers ( length needed )
// Note: the above 2 values must NOT change without also changing pids.h !!!
#define PROC_EDITCGRPCVT 0x00040000 // edit `cgroup' as regular string
#define PROC_EDITCMDLCVT 0x00080000 // edit `cmdline' as regular string
#define PROC_EDITENVRCVT 0x00100000 // edit `environ' as regular string
// these three also require the PROC_FILLSTATUS flage
#define PROC_FILL_OUSERS ( 0x00200000 | PROC_FILLSTATUS ) // obtain other user names
#define PROC_FILL_OGROUPS ( 0x00400000 | PROC_FILLSTATUS ) // obtain other group names
#define PROC_FILL_SUPGRP ( 0x00800000 | PROC_FILLSTATUS ) // obtain supplementary group names
// and let's put new flags here ...
#define PROC_FILLAUTOGRP 0x01000000 // fill in proc_t autogroup stuff
// it helps to give app code a few spare bits
#define PROC_SPARE_1 0x10000000
#define PROC_SPARE_2 0x20000000
#define PROC_SPARE_3 0x40000000
#define PROC_SPARE_4 0x80000000
// Function definitions
// Initialize a PROCTAB structure holding needed call-to-call persistent data
PROCTAB *openproc(unsigned flags, ... /* pid_t *| uid_t *| dev_t *| char *[, int n] */ );
// Retrieve the next process or task matching the criteria set by the openproc().
//
// Note: When NULL is used as the readproc 'p' or readeither 'x'
// parameter, the library will allocate the necessary proc_t storage.
//
// Alternatively, you may provide your own reuseable buffer address
// in which case that buffer *MUST* be initialized to zero one time
// only before first use. Thereafter, the library will manage such
// a passed proc_t, freeing any additional acquired memory associated
// with the previous process or thread.
proc_t *readproc(PROCTAB *__restrict const PT, proc_t *__restrict p);
proc_t *readeither(PROCTAB *__restrict const PT, proc_t *__restrict x);
int look_up_our_self(proc_t *p);
void closeproc(PROCTAB *PT);
char **vectorize_this_str(const char *src);
#endif
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