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fcntl: don't cap l_start and l_end values for F_GETLK64 in compat syscall

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Currently, we're capping the values too low in the F_GETLK64 case. The
fields in that structure are 64-bit values, so we shouldn't need to do
any sort of fixup there.

Make sure we check that assumption at build time in the future however
by ensuring that the sizes we're copying will fit.

With this, we no longer need COMPAT_LOFF_T_MAX either, so remove it.

Fixes: 94073ad77f (fs/locks: don't mess with the address limit in compat_fcntl64)
Reported-by: Vitaly Lipatov <lav@etersoft.ru>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Jeff Layton 2017-11-14 14:42:57 -05:00
parent 9280a601e6
commit 4d2dc2cc76
9 changed files with 5 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm64/include/asm/compat.h
View File

@ -215,7 +215,6 @@ typedef struct compat_siginfo {
} compat_siginfo_t;
#define COMPAT_OFF_T_MAX 0x7fffffff
#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL
/*
* A pointer passed in from user mode. This should not

1
arch/mips/include/asm/compat.h
View File

@ -200,7 +200,6 @@ typedef struct compat_siginfo {
} compat_siginfo_t;
#define COMPAT_OFF_T_MAX 0x7fffffff
#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL
/*
* A pointer passed in from user mode. This should not

1
arch/parisc/include/asm/compat.h
View File

@ -195,7 +195,6 @@ typedef struct compat_siginfo {
} compat_siginfo_t;
#define COMPAT_OFF_T_MAX 0x7fffffff
#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL
struct compat_ipc64_perm {
compat_key_t key;

1
arch/powerpc/include/asm/compat.h
View File

@ -185,7 +185,6 @@ typedef struct compat_siginfo {
} compat_siginfo_t;
#define COMPAT_OFF_T_MAX 0x7fffffff
#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL
/*
* A pointer passed in from user mode. This should not

1
arch/s390/include/asm/compat.h
View File

@ -263,7 +263,6 @@ typedef struct compat_siginfo {
#define si_overrun _sifields._timer._overrun
#define COMPAT_OFF_T_MAX 0x7fffffff
#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL
/*
* A pointer passed in from user mode. This should not

1
arch/sparc/include/asm/compat.h
View File

@ -209,7 +209,6 @@ typedef struct compat_siginfo {
} compat_siginfo_t;
#define COMPAT_OFF_T_MAX 0x7fffffff
#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL
/*
* A pointer passed in from user mode. This should not

1
arch/tile/include/asm/compat.h
View File

@ -173,7 +173,6 @@ typedef struct compat_siginfo {
} compat_siginfo_t;
#define COMPAT_OFF_T_MAX 0x7fffffff
#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL
struct compat_ipc64_perm {
compat_key_t key;

1
arch/x86/include/asm/compat.h
View File

@ -210,7 +210,6 @@ typedef struct compat_siginfo {
} compat_siginfo_t;
#define COMPAT_OFF_T_MAX 0x7fffffff
#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL
struct compat_ipc64_perm {
compat_key_t key;

11
fs/fcntl.c
View File

@ -563,6 +563,9 @@ static int put_compat_flock64(const struct flock *kfl, struct compat_flock64 __u
{
struct compat_flock64 fl;
BUILD_BUG_ON(sizeof(kfl->l_start) > sizeof(ufl->l_start));
BUILD_BUG_ON(sizeof(kfl->l_len) > sizeof(ufl->l_len));
memset(&fl, 0, sizeof(struct compat_flock64));
copy_flock_fields(&fl, kfl);
if (copy_to_user(ufl, &fl, sizeof(struct compat_flock64)))
@ -641,12 +644,8 @@ COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
if (err)
break;
err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock);
if (err)
break;
err = fixup_compat_flock(&flock);
if (err)
return err;
err = put_compat_flock64(&flock, compat_ptr(arg));
if (!err)
err = put_compat_flock64(&flock, compat_ptr(arg));
break;
case F_SETLK:
case F_SETLKW: