Messages in this thread | | | Subject | Linux 2.5 and Zsh bug | From | Stephen Hemminger <> | Date | 18 Oct 2002 14:01:07 -0700 |
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When running zsh on a Linux 2.5 kernel, the prompt always has a hash sign '#' rather than the normal user '$'. This probably happens because the shell function privasserted() is returning true for all users. I know nothing about Posix capabilities but the zsh code for this looks suspicious.
Code in question: ------------------------------------------------------------ /* isolate zsh bug */ #include <stdio.h> #include <sys/capability.h>
int privasserted(void) { if(!geteuid()) { printf("geteuid() is root\n"); return 1; } else { cap_t caps = cap_get_proc(); if(caps) { printf("caps = %p\n", caps); /* POSIX doesn't define a way to test whether a capability set * * is empty or not. Typical. I hope this is conforming... */ cap_flag_value_t val; cap_value_t n;
for(n = 0; !cap_get_flag(caps, n, CAP_EFFECTIVE, &val); n++) { if(val) { printf("capability %#x is %d\n", n, val); cap_free(caps); /* missing in original zsh code memory leak */ return 1; } } printf("last capability %#x\n", n);
cap_free(caps); } } return 0; }
int main(int argc, const char **argv) { printf("%s privledged\n", privasserted() ? "Is" : "Not"); }
------------------------------------------------ On 2.4.18 caps = 0x8049844 last capability 0x1d Not privledged
On 2.5.43 caps = 0x804a00c capability 0 is 1 Is privledged
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