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commit b04acb2651e0aaf615de50e9138cddfd5c24021f
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Author: Andreas Schwab <schwab@suse.de>
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Date: Tue Jul 30 11:58:45 2013 +0200
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Fix race conditions in pldd that may leave the process stopped after detaching
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Fixes bug 15804
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diff --git a/elf/pldd.c b/elf/pldd.c
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index 684aff4..75f7812 100644
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--- a/elf/pldd.c
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+++ b/elf/pldd.c
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@@ -34,6 +34,7 @@
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#include <unistd.h>
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#include <sys/ptrace.h>
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#include <sys/stat.h>
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+#include <sys/wait.h>
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#include <ldsodefs.h>
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#include <version.h>
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@@ -82,6 +83,7 @@ static char *exe;
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/* Local functions. */
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static int get_process_info (int dfd, long int pid);
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+static void wait_for_ptrace_stop (long int pid);
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int
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@@ -170,6 +172,8 @@ main (int argc, char *argv[])
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tid);
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}
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+ wait_for_ptrace_stop (tid);
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+
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struct thread_list *newp = alloca (sizeof (*newp));
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newp->tid = tid;
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newp->next = thread_list;
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@@ -194,6 +198,27 @@ main (int argc, char *argv[])
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}
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+/* Wait for PID to enter ptrace-stop state after being attached. */
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+static void
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+wait_for_ptrace_stop (long int pid)
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+{
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+ int status;
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+
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+ /* While waiting for SIGSTOP being delivered to the tracee we have to
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+ reinject any other pending signal. Ignore all other errors. */
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+ while (waitpid (pid, &status, __WALL) == pid && WIFSTOPPED (status))
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+ {
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+ /* The STOP signal should not be delivered to the tracee. */
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+ if (WSTOPSIG (status) == SIGSTOP)
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+ return;
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+ if (ptrace (PTRACE_CONT, pid, NULL,
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+ (void *) (uintptr_t) WSTOPSIG (status)))
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+ /* The only possible error is that the process died. */
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+ return;
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+ }
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+}
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+
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+
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/* Handle program arguments. */
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static error_t
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parse_opt (int key, char *arg, struct argp_state *state)
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