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author | Oleg Nesterov <oleg@redhat.com> | 2009-02-09 02:02:33 +0100 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-02-11 10:32:46 +0100 |
commit | 06eb23b1ba39c61ee5d5faeb42a097635693e370 (patch) | |
tree | a06f34d6ed32521ea32641df30732d9eb9d24757 /arch | |
parent | b52af40923fc91a12e3c7152d833e0c0c6a508f6 (diff) | |
download | kernel_samsung_smdk4412-06eb23b1ba39c61ee5d5faeb42a097635693e370.zip kernel_samsung_smdk4412-06eb23b1ba39c61ee5d5faeb42a097635693e370.tar.gz kernel_samsung_smdk4412-06eb23b1ba39c61ee5d5faeb42a097635693e370.tar.bz2 |
ptrace, x86: fix the usage of ptrace_fork()
I noticed by pure accident we have ptrace_fork() and friends. This was
added by "x86, bts: add fork and exit handling", commit
bf53de907dfdaac178c92d774aae7370d7b97d20.
I can't test this, ds_request_bts() returns -EOPNOTSUPP, but I strongly
believe this needs the fix. I think something like this program
int main(void)
{
int pid = fork();
if (!pid) {
ptrace(PTRACE_TRACEME, 0, NULL, NULL);
kill(getpid(), SIGSTOP);
fork();
} else {
struct ptrace_bts_config bts = {
.flags = PTRACE_BTS_O_ALLOC,
.size = 4 * 4096,
};
wait(NULL);
ptrace(PTRACE_SETOPTIONS, pid, NULL, PTRACE_O_TRACEFORK);
ptrace(PTRACE_BTS_CONFIG, pid, &bts, sizeof(bts));
ptrace(PTRACE_CONT, pid, NULL, NULL);
sleep(1);
}
return 0;
}
should crash the kernel.
If the task is traced by its natural parent ptrace_reparented() returns 0
but we should clear ->btsxxx anyway.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions