library: exploit linux-4.5 resident memory enhancement
Since support already exists in the newlib branch this represents an equivalent master branch implementation, and this commit message is shared with 2 more patches. Beginning with linux-4.5, the following new fields are being added under that /proc/<pid>/status pseudo file: . RssAnon - size of resident anonymous memory . RssFile - size of resident file mappings . RssShmem - size of resident shared memory p.s. Locked resident memory support was also added but isn't directly related to the kernel 4.5 enhancements. p.p.s. Archlinux, Debian-stretch and Fedora-23 already are currently using a 4.5 linux kernel (as of 6/2/16). Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
Craig Small
parent
7bf9457f71
commit
cb0e210930
149
proc/readproc.c
149
proc/readproc.c
@ -113,7 +113,7 @@ static inline void free_acquired (proc_t *p, int reuse) {
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///////////////////////////////////////////////////////////////////////////
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typedef struct status_table_struct {
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unsigned char name[7]; // /proc/*/status field name
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unsigned char name[8]; // /proc/*/status field name
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unsigned char len; // name length
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#ifdef LABEL_OFFSET
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long offset; // jump address offset
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@ -129,8 +129,11 @@ typedef struct status_table_struct {
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#endif
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#define NUL {"", 0, 0},
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#define GPERF_TABLE_SIZE 128
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// Derived from:
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// gperf -7 --language=ANSI-C --key-positions=1,3,4 -C -n -c <if-not-piped>
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// ( --key-positions verified by omission & reported "Computed positions" )
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//
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// Suggested method:
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// Grep this file for "case_", then strip those down to the name.
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@ -144,8 +147,8 @@ typedef struct status_table_struct {
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// the F macro and replacing empty strings with the NUL define.
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//
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// In the status_table_struct watch out for name size (grrr, expanding)
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// and the number of entries (we mask with 63 for now). The table
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// must be padded out to 64 entries, maybe 128 in the future.
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// and the number of entries. Currently, the table is padded to 128
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// entries and we therefore mask with 127.
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static void status2proc(char *S, proc_t *restrict P, int is_proc){
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long Threads = 0;
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@ -155,78 +158,76 @@ static void status2proc(char *S, proc_t *restrict P, int is_proc){
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// 128 entries because we trust the kernel to use ASCII names
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static const unsigned char asso[] =
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{
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 28, 64,
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64, 64, 64, 64, 64, 64, 8, 25, 23, 25,
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6, 25, 0, 3, 64, 64, 3, 64, 25, 64,
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20, 1, 1, 5, 0, 30, 0, 0, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 3, 64, 0,
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0, 18, 64, 10, 64, 10, 64, 64, 64, 20,
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64, 20, 0, 64, 25, 64, 3, 15, 64, 0,
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30, 64, 64, 64, 64, 64, 64, 64
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101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
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101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
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101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
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101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
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101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
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101, 101, 101, 101, 101, 101, 101, 101, 6, 101,
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101, 101, 101, 101, 101, 45, 55, 25, 31, 50,
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50, 10, 0, 35, 101, 101, 21, 101, 30, 101,
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20, 36, 0, 5, 0, 40, 0, 0, 101, 101,
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101, 101, 101, 101, 101, 101, 101, 30, 101, 15,
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0, 1, 101, 10, 101, 10, 101, 101, 101, 25,
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101, 40, 0, 101, 0, 50, 6, 40, 101, 1,
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35, 101, 101, 101, 101, 101, 101, 101
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};
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static const status_table_struct table[] = {
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static const status_table_struct table[GPERF_TABLE_SIZE] = {
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F(VmHWM)
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NUL NUL
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F(VmLck)
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NUL
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F(VmSwap)
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F(VmRSS)
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NUL
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F(VmStk)
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NUL
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F(Tgid)
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F(State)
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NUL
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F(VmLib)
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NUL
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F(VmSize)
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F(SigQ)
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NUL
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F(SigIgn)
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NUL
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F(VmPTE)
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F(FDSize)
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NUL
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F(SigBlk)
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NUL
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F(ShdPnd)
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F(VmData)
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NUL
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F(CapInh)
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NUL
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F(PPid)
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NUL NUL
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F(CapBnd)
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NUL
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F(SigPnd)
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NUL NUL
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F(VmPeak)
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NUL
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F(SigCgt)
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NUL NUL
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F(Threads)
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NUL
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F(CapPrm)
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NUL NUL
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F(Pid)
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NUL
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F(CapEff)
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NUL NUL
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NUL NUL NUL
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F(VmRSS)
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F(VmSwap)
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NUL NUL NUL
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F(Tgid)
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F(VmStk)
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NUL NUL NUL
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F(VmSize)
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F(Gid)
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NUL
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F(VmExe)
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NUL NUL
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NUL NUL NUL
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F(VmPTE)
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F(VmPeak)
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NUL NUL NUL
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F(ShdPnd)
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F(Pid)
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NUL NUL NUL
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F(PPid)
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F(VmLib)
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NUL NUL NUL
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F(SigPnd)
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F(VmLck)
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NUL NUL NUL
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F(SigCgt)
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F(State)
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NUL NUL NUL
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F(CapPrm)
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F(Uid)
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NUL
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F(Groups)
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NUL NUL
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NUL NUL NUL
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F(SigIgn)
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F(SigQ)
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NUL NUL NUL
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F(RssShmem)
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F(Name)
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NUL NUL NUL
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F(CapInh)
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F(VmData)
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NUL NUL NUL
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F(FDSize)
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NUL NUL NUL NUL
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F(SigBlk)
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NUL NUL NUL NUL
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F(CapEff)
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NUL NUL NUL NUL
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F(CapBnd)
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NUL NUL NUL NUL
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F(VmExe)
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NUL NUL NUL NUL
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F(Groups)
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NUL NUL NUL NUL
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F(RssAnon)
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NUL NUL NUL NUL
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F(RssFile)
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};
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#undef F
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@ -248,7 +249,7 @@ ENTER(0x220);
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// examine a field name (hash and compare)
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base:
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if(unlikely(!*S)) break;
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entry = table[63 & (asso[(int)S[3]] + asso[(int)S[2]] + asso[(int)S[0]])];
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entry = table[(GPERF_TABLE_SIZE -1) & (asso[(int)S[3]] + asso[(int)S[2]] + asso[(int)S[0]])];
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colon = strchr(S, ':');
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if(unlikely(!colon)) break;
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if(unlikely(colon[1]!='\t')) break;
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@ -361,6 +362,15 @@ ENTER(0x220);
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case_VmRSS:
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P->vm_rss = strtol(S,&S,10);
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continue;
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case_RssAnon: // subset of VmRSS, linux-4.5
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P->vm_rss_anon = strtol(S,&S,10);
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continue;
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case_RssFile: // subset of VmRSS, linux-4.5
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P->vm_rss_file = strtol(S,&S,10);
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continue;
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case_RssShmem: // subset of VmRSS, linux-4.5
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P->vm_rss_shared = strtol(S,&S,10);
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continue;
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case_VmSize:
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P->vm_size = strtol(S,&S,10);
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continue;
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@ -436,6 +446,7 @@ ENTER(0x220);
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LEAVE(0x220);
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}
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#undef GPERF_TABLE_SIZE
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static void supgrps_from_supgids (proc_t *p) {
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char *g, *s;
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@ -116,6 +116,9 @@ typedef struct proc_t {
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vm_size, // status equals 'size' (as kb)
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vm_lock, // status locked pages (as kb)
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vm_rss, // status equals 'rss' and/or 'resident' (as kb)
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vm_rss_anon, // status the 'anonymous' portion of vm_rss (as kb)
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vm_rss_file, // status the 'file-backed' portion of vm_rss (as kb)
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vm_rss_shared, // status the 'shared' portion of vm_rss (as kb)
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vm_data, // status data only size (as kb)
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vm_stack, // status stack only size (as kb)
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vm_swap, // status based on linux-2.6.34 "swap ents" (as kb)
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