From e0ddf8eac9f83c0bc5a3d39605d873ee0fe53421 Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Sat, 8 Jul 2023 07:00:25 +0200 Subject: [PATCH] linux-user: Fix fcntl() and fcntl64() to return O_LARGEFILE for 32-bit targets When running a 32-bit guest on a 64-bit host, fcntl[64](F_GETFL) should return with the TARGET_O_LARGEFILE flag set, because all 64-bit hosts support large files unconditionally. But on 64-bit hosts, O_LARGEFILE has the value 0, so the flag translation can't be done with the fcntl_flags_tbl[]. Instead add the TARGET_O_LARGEFILE flag afterwards. Note that for 64-bit guests the compiler will optimize away this code, since TARGET_O_LARGEFILE is zero. Signed-off-by: Helge Deller Reviewed-by: Richard Henderson --- linux-user/syscall.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 08162cc966e3..10f05b1e556d 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -7132,6 +7132,10 @@ static abi_long do_fcntl(int fd, int cmd, abi_ulong arg) ret = get_errno(safe_fcntl(fd, host_cmd, arg)); if (ret >= 0) { ret = host_to_target_bitmask(ret, fcntl_flags_tbl); + /* tell 32-bit guests it uses largefile on 64-bit hosts: */ + if (O_LARGEFILE == 0 && HOST_LONG_BITS == 64) { + ret |= TARGET_O_LARGEFILE; + } } break;