mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

linux-user: Fix ioctl cmd type mismatch on 64-bit targets

Browse Source 
linux-user passes the cmd argument of the ioctl syscall as a signed long,
but compares it to an unsigned int when iterating through the ioctl_entries
list.  When the cmd is a large value like 0x80047476 (TARGET_TIOCSWINSZ on
mips64) it gets sign-extended to 0xffffffff80047476, causing the comparison
to fail and resulting in lots of spurious "Unsupported ioctl" errors.
Changing the target_cmd field in the ioctl_entries list to a signed int
causes those values to be sign-extended as well during the comparison.

Signed-off-by: Ed Swierk <eswierk@skyportsystems.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Ed Swierk 2014-12-16 12:55:31 -08:00 committed by Riku Voipio
parent 95018018ca
commit 9c6bf9c7d7
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
linux-user/syscall.c
View File

@ -3278,7 +3278,7 @@ typedef abi_long do_ioctl_fn(const IOCTLEntry *ie, uint8_t *buf_temp,
int fd, abi_long cmd, abi_long arg); int fd, abi_long cmd, abi_long arg);
struct IOCTLEntry { struct IOCTLEntry {
unsigned int target_cmd; int target_cmd;
unsigned int host_cmd; unsigned int host_cmd;
const char *name; const char *name;
int access; int access;