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Fix race conditions in pldd that may leave the process stopped after detaching
Fixes bug 15804
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@ -1,3 +1,9 @@
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2014-02-24 Andreas Schwab <schwab@suse.de>
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[BZ #15804]
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* elf/pldd.c (wait_for_ptrace_stop): New function.
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(main): Call it after attaching.
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2014-02-22 Roland McGrath <roland@hack.frob.com>
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* Makerules ($(common-objpfx)Versions.v.i): No longer depend
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2
NEWS
2
NEWS
@ -9,7 +9,7 @@ Version 2.20
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* The following bugs are resolved with this release:
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15894, 16447, 16545, 16574, 16600, 16609, 16610, 16611.
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15804, 15894, 16447, 16545, 16574, 16600, 16609, 16610, 16611.
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* The am33 port, which had not worked for several years, has been removed
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from ports.
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25
elf/pldd.c
25
elf/pldd.c
@ -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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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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/* 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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/* 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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