because of the p->dumpable check in `proc_pid_fill_inode'
(fs/proc/base.c), binaries that are set[ug]id are not permitted to
open "/proc/self/mem" (since this is owned by 0.0 in this case). Is
this a bug, or am I just missing the rationale for this?
Simple testcase:
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
int main()
{
char *name = "/proc/self/mem";
FILE *f;
struct stat st;
stat(name, &st);
printf("%s uid %d gid %d\n", name, st.st_uid, st.st_gid);
f = fopen(name, "r");
if (f)
fclose(f);
else
perror("open");
return 0;
}
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