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Drop ambient capabilities #228

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merged 3 commits into from
Nov 24, 2020
Merged

Drop ambient capabilities #228

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255c7d3
Drop ambient capabilities
RH-steve-grubb Nov 23, 2020
979e41d
Update comment to have more explanation
RH-steve-grubb Nov 24, 2020
4431076
Update comment to have more explanation
RH-steve-grubb Nov 24, 2020
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7 changes: 7 additions & 0 deletions main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <time.h>
Expand Down Expand Up @@ -91,6 +92,12 @@ int main(int argc, char* argv[])
fatal(4, "Could not cd to /proc: %s", strerror(errno));
}

// When systemd starts a daemon with capabilities, it uses ambient
// capabilities to do so. If not dropped, the capabilities can spread
// to any child process. This is usually not necessary and its a good
// idea to drop them if not needed.
prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL, 0, 0, 0);

meminfo_t m = parse_meminfo();

int c;
Expand Down