Messages in this thread Patch in this message | | | From | "Michael Kerrisk (man-pages)" <> | Date | Mon, 23 Apr 2012 21:34:27 +1200 | Subject | Re: [PATCH] Reset current->pdeath_signal on SUID binary execution |
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Marcel,
On Sat, Aug 18, 2007 at 7:47 AM, Marcel Holtmann <marcel@holtmann.org> wrote: > Hi Linus, > > the attached patch fixes a flaw in the "parent process death signal" > when executing SUID binaries. An unprivileged user may send arbitrary > signal to a child process even if it is running with higher privileges. > > The idea to fix this issue is to reset pdeath_signal not only on fork, > but also on the execution of a SUID binary. > > Michael, if we fix it this way, then the prctl() manual page should > reflect that behavior.
For man-pages-3.40, I applied the patch below.
Cheers,
Michael
--- a/man2/prctl.2 +++ b/man2/prctl.2 @@ -220,7 +220,9 @@ in the range 1..maxsig, or 0 to clear). This is the signal that the calling process will get when its parent dies. This value is cleared for the child of a -.BR fork (2). +.BR fork (2) +and (since Linux 2.5.36 / 2.6.23) +when execing a set-user_ID or set-group-ID binary. .TP .BR PR_GET_PDEATHSIG " (since Linux 2.3.15)" Return the current value of the parent process death signal,
-- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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