diff options
author | Laurent Vivier <laurent@vivier.eu> | 2018-05-10 01:11:21 +0200 |
---|---|---|
committer | Laurent Vivier <laurent@vivier.eu> | 2018-05-11 19:05:19 +0200 |
commit | ae68ad9fee4e51eae26e34b43a9e6999bd1c6819 (patch) | |
tree | 6126eed6547bb2bd31314a89e52f11251f929b03 /linux-user | |
parent | 534cdbf56c2a72952ffde9a258160f5586cea886 (diff) | |
download | qemu-ae68ad9fee4e51eae26e34b43a9e6999bd1c6819.zip qemu-ae68ad9fee4e51eae26e34b43a9e6999bd1c6819.tar.gz qemu-ae68ad9fee4e51eae26e34b43a9e6999bd1c6819.tar.bz2 |
linux-user: fix conversion of flock/flock64 l_type field
As l_type values (F_RDLCK, F_WRLCK, F_UNLCK, F_EXLCK, F_SHLCK)
are not bitmasks, we can't use target_to_host_bitmask() and
host_to_target_bitmask() to convert them.
Introduce target_to_host_flock() and host_to_target_flock()
to convert values between host and target.
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Message-Id: <20180509231123.20864-5-laurent@vivier.eu>
Diffstat (limited to 'linux-user')
-rw-r--r-- | linux-user/syscall.c | 66 |
1 files changed, 48 insertions, 18 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c index e482574..af8603f 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -6546,28 +6546,50 @@ static int target_to_host_fcntl_cmd(int cmd) return -TARGET_EINVAL; } -#define TRANSTBL_CONVERT(a) { -1, TARGET_##a, -1, a } -static const bitmask_transtbl flock_tbl[] = { - TRANSTBL_CONVERT(F_RDLCK), - TRANSTBL_CONVERT(F_WRLCK), - TRANSTBL_CONVERT(F_UNLCK), - TRANSTBL_CONVERT(F_EXLCK), - TRANSTBL_CONVERT(F_SHLCK), - { 0, 0, 0, 0 } -}; +#define FLOCK_TRANSTBL \ + switch (type) { \ + TRANSTBL_CONVERT(F_RDLCK); \ + TRANSTBL_CONVERT(F_WRLCK); \ + TRANSTBL_CONVERT(F_UNLCK); \ + TRANSTBL_CONVERT(F_EXLCK); \ + TRANSTBL_CONVERT(F_SHLCK); \ + } + +static int target_to_host_flock(int type) +{ +#define TRANSTBL_CONVERT(a) case TARGET_##a: return a + FLOCK_TRANSTBL +#undef TRANSTBL_CONVERT + return -TARGET_EINVAL; +} + +static int host_to_target_flock(int type) +{ +#define TRANSTBL_CONVERT(a) case a: return TARGET_##a + FLOCK_TRANSTBL +#undef TRANSTBL_CONVERT + /* if we don't know how to convert the value coming + * from the host we copy to the target field as-is + */ + return type; +} static inline abi_long copy_from_user_flock(struct flock64 *fl, abi_ulong target_flock_addr) { struct target_flock *target_fl; - short l_type; + int l_type; if (!lock_user_struct(VERIFY_READ, target_fl, target_flock_addr, 1)) { return -TARGET_EFAULT; } __get_user(l_type, &target_fl->l_type); - fl->l_type = target_to_host_bitmask(l_type, flock_tbl); + l_type = target_to_host_flock(l_type); + if (l_type < 0) { + return l_type; + } + fl->l_type = l_type; __get_user(fl->l_whence, &target_fl->l_whence); __get_user(fl->l_start, &target_fl->l_start); __get_user(fl->l_len, &target_fl->l_len); @@ -6586,7 +6608,7 @@ static inline abi_long copy_to_user_flock(abi_ulong target_flock_addr, return -TARGET_EFAULT; } - l_type = host_to_target_bitmask(fl->l_type, flock_tbl); + l_type = host_to_target_flock(fl->l_type); __put_user(l_type, &target_fl->l_type); __put_user(fl->l_whence, &target_fl->l_whence); __put_user(fl->l_start, &target_fl->l_start); @@ -6604,14 +6626,18 @@ static inline abi_long copy_from_user_oabi_flock64(struct flock64 *fl, abi_ulong target_flock_addr) { struct target_oabi_flock64 *target_fl; - short l_type; + int l_type; if (!lock_user_struct(VERIFY_READ, target_fl, target_flock_addr, 1)) { return -TARGET_EFAULT; } __get_user(l_type, &target_fl->l_type); - fl->l_type = target_to_host_bitmask(l_type, flock_tbl); + l_type = target_to_host_flock(l_type); + if (l_type < 0) { + return l_type; + } + fl->l_type = l_type; __get_user(fl->l_whence, &target_fl->l_whence); __get_user(fl->l_start, &target_fl->l_start); __get_user(fl->l_len, &target_fl->l_len); @@ -6630,7 +6656,7 @@ static inline abi_long copy_to_user_oabi_flock64(abi_ulong target_flock_addr, return -TARGET_EFAULT; } - l_type = host_to_target_bitmask(fl->l_type, flock_tbl); + l_type = host_to_target_flock(fl->l_type); __put_user(l_type, &target_fl->l_type); __put_user(fl->l_whence, &target_fl->l_whence); __put_user(fl->l_start, &target_fl->l_start); @@ -6645,14 +6671,18 @@ static inline abi_long copy_from_user_flock64(struct flock64 *fl, abi_ulong target_flock_addr) { struct target_flock64 *target_fl; - short l_type; + int l_type; if (!lock_user_struct(VERIFY_READ, target_fl, target_flock_addr, 1)) { return -TARGET_EFAULT; } __get_user(l_type, &target_fl->l_type); - fl->l_type = target_to_host_bitmask(l_type, flock_tbl); + l_type = target_to_host_flock(l_type); + if (l_type < 0) { + return l_type; + } + fl->l_type = l_type; __get_user(fl->l_whence, &target_fl->l_whence); __get_user(fl->l_start, &target_fl->l_start); __get_user(fl->l_len, &target_fl->l_len); @@ -6671,7 +6701,7 @@ static inline abi_long copy_to_user_flock64(abi_ulong target_flock_addr, return -TARGET_EFAULT; } - l_type = host_to_target_bitmask(fl->l_type, flock_tbl); + l_type = host_to_target_flock(fl->l_type); __put_user(l_type, &target_fl->l_type); __put_user(fl->l_whence, &target_fl->l_whence); __put_user(fl->l_start, &target_fl->l_start); |