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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2018-10-09 23:40:09 +0200 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2018-10-28 13:41:51 +0100 |
| commit | 5c81be53407434ce22b849722a3d691295480016 (patch) | |
| tree | 930f36f9263b5d02c176d6b13b0ed5a762c8fd83 /hurd/intr-msg.c | |
| parent | 2d0d1d38761cd9aeb7063c5cce1993cec909f67f (diff) | |
| download | glibc-5c81be53407434ce22b849722a3d691295480016.zip glibc-5c81be53407434ce22b849722a3d691295480016.tar.gz glibc-5c81be53407434ce22b849722a3d691295480016.tar.bz2 | |
hurd: Fix race between calling RPC and handling a signal
* sysdeps/mach/hurd/i386/intr-msg.h (INTR_MSG_TRAP): Make
_hurd_intr_rpc_msg_about_to global point to start of controlled
assembly snippet. Make it check canceled flag.
* hurd/hurdsig.c (_hurdsig_abort_rpcs): Only mutate thread if it passed
the _hurd_intr_rpc_msg_about_to point.
* hurd/intr-msg.c (_hurd_intr_rpc_mach_msg): Remove comment on mutation
issue, remove cancel flag check.
Diffstat (limited to 'hurd/intr-msg.c')
| -rw-r--r-- | hurd/intr-msg.c | 17 |
1 files changed, 2 insertions, 15 deletions
diff --git a/hurd/intr-msg.c b/hurd/intr-msg.c index 1f7724e..7ace0a1 100644 --- a/hurd/intr-msg.c +++ b/hurd/intr-msg.c @@ -114,23 +114,10 @@ _hurd_intr_rpc_mach_msg (mach_msg_header_t *msg, message: - /* XXX - At all points here (once SS->intr_port is set), the signal thread - thinks we are "about to enter the syscall", and might mutate our - return-value register. This is bogus. - */ - - if (ss->cancel) - { - /* We have been cancelled. Don't do an RPC at all. */ - ss->intr_port = MACH_PORT_NULL; - ss->cancel = 0; - return EINTR; - } - /* Note that the signal trampoline code might modify our OPTION! */ err = INTR_MSG_TRAP (msg, option, send_size, - rcv_size, rcv_name, timeout, notify); + rcv_size, rcv_name, timeout, notify, + &ss->cancel, &ss->intr_port); switch (err) { |