linux-user: Fix conversion of sigevent argument to timer_create
There were a number of bugs in the conversion of the sigevent argument to timer_create from target to host format: * signal number not converted from target to host * thread ID not copied across * sigev_value not copied across * we never unlocked the struct when we were done Between them, these problems meant that SIGEV_THREAD_ID timers (and the glibc-implemented SIGEV_THREAD timers which depend on them) didn't work. Fix these problems and clean up the code a little by pulling the struct conversion out into its own function, in line with how we convert various other structs. This allows the test program in bug LP:1042388 to run. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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@ -4912,6 +4912,32 @@ static inline abi_long host_to_target_itimerspec(abi_ulong target_addr,
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return 0;
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return 0;
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}
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}
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static inline abi_long target_to_host_sigevent(struct sigevent *host_sevp,
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abi_ulong target_addr)
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{
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struct target_sigevent *target_sevp;
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if (!lock_user_struct(VERIFY_READ, target_sevp, target_addr, 1)) {
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return -TARGET_EFAULT;
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}
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/* This union is awkward on 64 bit systems because it has a 32 bit
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* integer and a pointer in it; we follow the conversion approach
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* used for handling sigval types in signal.c so the guest should get
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* the correct value back even if we did a 64 bit byteswap and it's
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* using the 32 bit integer.
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*/
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host_sevp->sigev_value.sival_ptr =
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(void *)(uintptr_t)tswapal(target_sevp->sigev_value.sival_ptr);
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host_sevp->sigev_signo =
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target_to_host_signal(tswap32(target_sevp->sigev_signo));
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host_sevp->sigev_notify = tswap32(target_sevp->sigev_notify);
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host_sevp->_sigev_un._tid = tswap32(target_sevp->_sigev_un._tid);
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unlock_user_struct(target_sevp, target_addr, 1);
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return 0;
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}
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#if defined(TARGET_NR_stat64) || defined(TARGET_NR_newfstatat)
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#if defined(TARGET_NR_stat64) || defined(TARGET_NR_newfstatat)
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static inline abi_long host_to_target_stat64(void *cpu_env,
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static inline abi_long host_to_target_stat64(void *cpu_env,
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abi_ulong target_addr,
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abi_ulong target_addr,
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@ -9403,7 +9429,6 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
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/* args: clockid_t clockid, struct sigevent *sevp, timer_t *timerid */
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/* args: clockid_t clockid, struct sigevent *sevp, timer_t *timerid */
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struct sigevent host_sevp = { {0}, }, *phost_sevp = NULL;
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struct sigevent host_sevp = { {0}, }, *phost_sevp = NULL;
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struct target_sigevent *ptarget_sevp;
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struct target_timer_t *ptarget_timer;
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struct target_timer_t *ptarget_timer;
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int clkid = arg1;
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int clkid = arg1;
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@ -9415,14 +9440,11 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
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timer_t *phtimer = g_posix_timers + timer_index;
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timer_t *phtimer = g_posix_timers + timer_index;
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if (arg2) {
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if (arg2) {
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if (!lock_user_struct(VERIFY_READ, ptarget_sevp, arg2, 1)) {
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goto efault;
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}
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host_sevp.sigev_signo = tswap32(ptarget_sevp->sigev_signo);
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host_sevp.sigev_notify = tswap32(ptarget_sevp->sigev_notify);
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phost_sevp = &host_sevp;
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phost_sevp = &host_sevp;
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ret = target_to_host_sigevent(phost_sevp, arg2);
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if (ret != 0) {
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break;
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}
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}
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}
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ret = get_errno(timer_create(clkid, phost_sevp, phtimer));
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ret = get_errno(timer_create(clkid, phost_sevp, phtimer));
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