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linux-user: Fix getresuid, getresgid if !USE_UID16 

The size of the UID/GID types depends on whether USE_UID16 is
defined. Define a new put_user_id() which writes a uid/gid
type to guest memory. This fixes getresuid and getresgid, which
were always storing 16 bits even if the uid type was 32 bits.

Reported-by: Michael Matz <matz@suse.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Peter Maydell 2014-03-02 19:36:41 +00:00 committed by Riku Voipio
parent cd98d390ae
commit 76ca310a19
1 changed files with 12 additions and 6 deletions
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18
linux-user/syscall.c
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@ -4528,6 +4528,9 @@ static inline int tswapid(int id)
{
return tswap16(id);
}
#define put_user_id(x, gaddr) put_user_u16(x, gaddr)
#else /* !USE_UID16 */
static inline int high2lowuid(int uid)
{
@ -4549,6 +4552,9 @@ static inline int tswapid(int id)
{
return tswap32(id);
}
#define put_user_id(x, gaddr) put_user_u32(x, gaddr)
#endif /* USE_UID16 */
void syscall_init(void)
@ -7805,9 +7811,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
uid_t ruid, euid, suid;
ret = get_errno(getresuid(&ruid, &euid, &suid));
if (!is_error(ret)) {
if (put_user_u16(high2lowuid(ruid), arg1)
|| put_user_u16(high2lowuid(euid), arg2)
|| put_user_u16(high2lowuid(suid), arg3))
if (put_user_id(high2lowuid(ruid), arg1)
|| put_user_id(high2lowuid(euid), arg2)
|| put_user_id(high2lowuid(suid), arg3))
goto efault;
}
}
@ -7826,9 +7832,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
gid_t rgid, egid, sgid;
ret = get_errno(getresgid(&rgid, &egid, &sgid));
if (!is_error(ret)) {
if (put_user_u16(high2lowgid(rgid), arg1)
|| put_user_u16(high2lowgid(egid), arg2)
|| put_user_u16(high2lowgid(sgid), arg3))
if (put_user_id(high2lowgid(rgid), arg1)
|| put_user_id(high2lowgid(egid), arg2)
|| put_user_id(high2lowgid(sgid), arg3))
goto efault;
}
}