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rt: Set shm_open as a non cancellation point (BZ #18243)

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This patch changes shm_open to not act as a cancellation point.
Cancellation is disable at start and reenable in function exit.
It fixes BZ #18243.

Tested on x86_64 and i686.

	[BZ #18243]
	* rt/Makefile (test): Add tst-shm-cancel.
	* rt/tst-shm-cancel.c: New file.
	* sysdeps/posix/shm_open.c: Disable asynchronous cancellation.
This commit is contained in:
Adhemerval Zanella
2016-08-22 10:31:42 -03:00
parent 47677f2edc
commit fbc994921b
4 changed files with 143 additions and 1 deletions
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7
sysdeps/posix/shm_open.c
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@ -40,6 +40,11 @@ shm_open (const char *name, int oflag, mode_t mode)
# ifdef O_CLOEXEC
oflag |= O_CLOEXEC;
# endif
/* Disable asynchronous cancellation. */
int state;
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &state);
int fd = open (shm_name, oflag, mode);
if (fd == -1 && __glibc_unlikely (errno == EISDIR))
/* It might be better to fold this error with EINVAL since
@ -70,6 +75,8 @@ shm_open (const char *name, int oflag, mode_t mode)
}
# endif
pthread_setcancelstate (state, NULL);
return fd;
}