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linux-user: fix target_to_host_timespec64()

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in 32 bit mode, drop the padding in tv_nsec. If host is 64bit and target
is 32bit, the padding bytes will be copied from the target and as the
kernel checks the value, the syscall exits with EINVAL.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200827070449.2386007-1-laurent@vivier.eu>
Fixes: c6c8d1026e ("linux-user/syscall: Add support for clock_gettime64/clock_settime64")
This commit is contained in:
Laurent Vivier 2020-08-27 09:04:49 +02:00
parent dcbcf5cf1c
commit 0057675789
1 changed files with 2 additions and 0 deletions
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linux-user/syscall.c
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@ -1229,6 +1229,8 @@ static inline abi_long target_to_host_timespec64(struct timespec *host_ts,
} }
__get_user(host_ts->tv_sec, &target_ts->tv_sec); __get_user(host_ts->tv_sec, &target_ts->tv_sec);
__get_user(host_ts->tv_nsec, &target_ts->tv_nsec); __get_user(host_ts->tv_nsec, &target_ts->tv_nsec);
/* in 32bit mode, this drops the padding */
host_ts->tv_nsec = (long)(abi_long)host_ts->tv_nsec;
unlock_user_struct(target_ts, target_addr, 0); unlock_user_struct(target_ts, target_addr, 0);
return 0; return 0;
} }