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90 lines
2.1 KiB
90 lines
2.1 KiB
6 years ago
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diff --git a/proc/sysinfo.c b/proc/sysinfo.c
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index 1435de1..1d2b8e2 100644
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--- a/proc/sysinfo.c
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+++ b/proc/sysinfo.c
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@@ -36,6 +36,9 @@
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#include <netinet/in.h> /* htons */
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#endif
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+#include <link.h>
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+#include <elf.h>
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+
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long smp_num_cpus; /* number of CPUs */
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long page_bytes; /* this architecture's page size */
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@@ -249,15 +252,67 @@ static void old_Hertz_hack(void){
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extern char** environ;
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-/* for ELF executables, notes are pushed before environment and args */
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-static unsigned long find_elf_note(unsigned long findme){
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+static unsigned long find_elf_note(unsigned long type)
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+{
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+ ElfW(auxv_t) auxv_struct;
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+ ElfW(auxv_t) *auxv_temp;
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+ FILE *fd;
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+ int i;
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+ static ElfW(auxv_t) *auxv = NULL;
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unsigned long *ep = (unsigned long *)environ;
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- while(*ep++);
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- while(*ep){
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- if(ep[0]==findme) return ep[1];
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- ep+=2;
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+ unsigned long ret_val = NOTE_NOT_FOUND;
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+
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+
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+ if(!auxv) {
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+
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+ fd = fopen("/proc/self/auxv", "rb");
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+
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+ if(!fd) { // can't open auxv? that could be caused by euid change
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+ // ... and we need to fall back to the old and unsafe
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+ // ... method that doesn't work when calling library
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+ // ... functions with dlopen -> FIXME :(
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+
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+ while(*ep++); // for ELF executables, notes are pushed
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+ while(*ep){ // ... before environment and args
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+ if(ep[0]==type) return ep[1];
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+ ep+=2;
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+ }
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+ return NOTE_NOT_FOUND;
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+ }
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+
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+ auxv = (ElfW(auxv_t) *) malloc(getpagesize());
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+ if (!auxv) {
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+ perror("malloc");
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+ exit(EXIT_FAILURE);
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+ }
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+
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+ i = 0;
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+ do {
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+ fread(&auxv_struct, sizeof(ElfW(auxv_t)), 1, fd);
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+ auxv[i] = auxv_struct;
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+ i++;
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+ } while (auxv_struct.a_type != AT_NULL);
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+
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+ fclose(fd);
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+
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+ }
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+
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+ auxv_temp = auxv;
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+ i = 0;
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+ do {
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+ if(auxv_temp[i].a_type == type) {
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+ ret_val = (unsigned long)auxv_temp[i].a_un.a_val;
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+ break;
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+ }
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+ i++;
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+ } while (auxv_temp[i].a_type != AT_NULL);
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+
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+ if (auxv){
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+ auxv_temp = NULL;
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+ free(auxv);
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+ auxv = NULL;
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}
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- return NOTE_NOT_FOUND;
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+ return ret_val;
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}
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int have_privs;
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