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linux-user: fix inotify 

When a fd is opened using inotify_init(), a read provides
one or more inotify_event structures:

    struct inotify_event {
        int      wd;
        uint32_t mask;
        uint32_t cookie;
        uint32_t len;
        char     name[];
    };

The integer fields must be byte-swapped to the target endianness.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Laurent Vivier 2017-03-02 01:54:48 +01:00 committed by Riku Voipio
parent 43046b5a07
commit c4e316cfb5
1 changed files with 29 additions and 0 deletions
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29
linux-user/syscall.c
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@ -7693,6 +7693,33 @@ static TargetFdTrans target_eventfd_trans = {
.target_to_host_data = swap_data_eventfd,
};
#if (defined(TARGET_NR_inotify_init) && defined(__NR_inotify_init)) || \
(defined(CONFIG_INOTIFY1) && defined(TARGET_NR_inotify_init1) && \
defined(__NR_inotify_init1))
static abi_long host_to_target_data_inotify(void *buf, size_t len)
{
struct inotify_event *ev;
int i;
uint32_t name_len;
for (i = 0; i < len; i += sizeof(struct inotify_event) + name_len) {
ev = (struct inotify_event *)((char *)buf + i);
name_len = ev->len;
ev->wd = tswap32(ev->wd);
ev->mask = tswap32(ev->mask);
ev->cookie = tswap32(ev->cookie);
ev->len = tswap32(name_len);
}
return len;
}
static TargetFdTrans target_inotify_trans = {
.host_to_target_data = host_to_target_data_inotify,
};
#endif
/* do_syscall() should always have a single exit point at the end so
that actions, such as logging of syscall results, can be performed.
All errnos that do_syscall() returns must be -TARGET_<errcode>. */
@ -11736,6 +11763,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
#if defined(TARGET_NR_inotify_init) && defined(__NR_inotify_init)
case TARGET_NR_inotify_init:
ret = get_errno(sys_inotify_init());
fd_trans_register(ret, &target_inotify_trans);
break;
#endif
#ifdef CONFIG_INOTIFY1
@ -11743,6 +11771,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
case TARGET_NR_inotify_init1:
ret = get_errno(sys_inotify_init1(target_to_host_bitmask(arg1,
fcntl_flags_tbl)));
fd_trans_register(ret, &target_inotify_trans);
break;
#endif
#endif