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linux-user: rlimit conversion between host and target.

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rlim_t conversion between host and target added.
Otherwise there are some incorrect case like
- RLIM_INFINITY on 32bit target -> 64bit host.
- RLIM_INFINITY on 64bit host -> mips and sparc target ?
- Big value(for 32bit target) on 64bit host -> 32bit target.

One is added into getrlimit, setrlimit, and ugetrlimit. It converts both
RLIM_INFINITY and value bigger than target can hold(>31bit) to RLIM_INFINITY.

Another one is added to guest_stack_size calculation introduced by
703e0e89. The rule is mostly same except the result on the case is keeping
the value of guest_stack_size.

Slightly tested for SH4, and x86_64 -linux-user on x86_64-pc-linux host.

Signed-off-by: Takashi YOSHII <takasi-y@ops.dti.ne.jp>
Acked-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
takasi-y@ops.dti.ne.jp 2010-04-12 04:07:35 +09:00 committed by Aurelien Jarno
parent c69ea0dff2
commit 81bbe906c8
3 changed files with 32 additions and 9 deletions
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3
linux-user/main.c
View File

@ -2706,7 +2706,8 @@ int main(int argc, char **argv, char **envp)
{
struct rlimit lim;
if (getrlimit(RLIMIT_STACK, &lim) == 0
&& lim.rlim_cur != RLIM_INFINITY) {
&& lim.rlim_cur != RLIM_INFINITY
&& lim.rlim_cur == (target_long)lim.rlim_cur) {
guest_stack_size = lim.rlim_cur;
}
}

30
linux-user/syscall.c
View File

@ -831,6 +831,22 @@ static inline abi_long host_to_target_rusage(abi_ulong target_addr,
return 0;
}
static inline rlim_t target_to_host_rlim(target_ulong target_rlim)
{
if (target_rlim == TARGET_RLIM_INFINITY)
return RLIM_INFINITY;
else
return tswapl(target_rlim);
}
static inline target_ulong host_to_target_rlim(rlim_t rlim)
{
if (rlim == RLIM_INFINITY || rlim != (target_long)rlim)
return TARGET_RLIM_INFINITY;
else
return tswapl(rlim);
}
static inline abi_long copy_from_user_timeval(struct timeval *tv,
abi_ulong target_tv_addr)
{
@ -5124,21 +5140,19 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
break;
case TARGET_NR_setrlimit:
{
/* XXX: convert resource ? */
int resource = arg1;
struct target_rlimit *target_rlim;
struct rlimit rlim;
if (!lock_user_struct(VERIFY_READ, target_rlim, arg2, 1))
goto efault;
rlim.rlim_cur = tswapl(target_rlim->rlim_cur);
rlim.rlim_max = tswapl(target_rlim->rlim_max);
rlim.rlim_cur = target_to_host_rlim(target_rlim->rlim_cur);
rlim.rlim_max = target_to_host_rlim(target_rlim->rlim_max);
unlock_user_struct(target_rlim, arg2, 0);
ret = get_errno(setrlimit(resource, &rlim));
}
break;
case TARGET_NR_getrlimit:
{
/* XXX: convert resource ? */
int resource = arg1;
struct target_rlimit *target_rlim;
struct rlimit rlim;
@ -5147,8 +5161,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
if (!is_error(ret)) {
if (!lock_user_struct(VERIFY_WRITE, target_rlim, arg2, 0))
goto efault;
target_rlim->rlim_cur = tswapl(rlim.rlim_cur);
target_rlim->rlim_max = tswapl(rlim.rlim_max);
target_rlim->rlim_cur = host_to_target_rlim(rlim.rlim_cur);
target_rlim->rlim_max = host_to_target_rlim(rlim.rlim_max);
unlock_user_struct(target_rlim, arg2, 1);
}
}
@ -6233,8 +6247,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
struct target_rlimit *target_rlim;
if (!lock_user_struct(VERIFY_WRITE, target_rlim, arg2, 0))
goto efault;
target_rlim->rlim_cur = tswapl(rlim.rlim_cur);
target_rlim->rlim_max = tswapl(rlim.rlim_max);
target_rlim->rlim_cur = host_to_target_rlim(rlim.rlim_cur);
target_rlim->rlim_max = host_to_target_rlim(rlim.rlim_max);
unlock_user_struct(target_rlim, arg2, 1);
}
break;

8
linux-user/syscall_defs.h
View File

@ -669,6 +669,14 @@ struct target_rlimit {
abi_ulong rlim_max;
};
#if defined(TARGET_ALPHA)
#define TARGET_RLIM_INFINITY 0x7ffffffffffffffful
#elif defined(TARGET_MIPS) || defined(TARGET_SPARC)
#define TARGET_RLIM_INFINITY 0x7fffffffUL
#else
#define TARGET_RLIM_INFINITY ((target_ulong)~0UL)
#endif
struct target_pollfd {
int fd; /* file descriptor */
short events; /* requested events */