summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJeff Layton <jlayton@redhat.com>2017-11-14 14:42:57 -0500
committerJeff Layton <jlayton@redhat.com>2017-11-15 08:08:36 -0500
commit4d2dc2cc766c3b51929658cacbc6e34fc8e242fb (patch)
treecc8fca80ff984b268f9acedbb582f1f7a410ac69
parent9280a601e6080c9ff658468c1c775ff6514099a6 (diff)
fcntl: don't cap l_start and l_end values for F_GETLK64 in compat syscall
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: 94073ad77fff2 (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>
-rw-r--r--arch/arm64/include/asm/compat.h1
-rw-r--r--arch/mips/include/asm/compat.h1
-rw-r--r--arch/parisc/include/asm/compat.h1
-rw-r--r--arch/powerpc/include/asm/compat.h1
-rw-r--r--arch/s390/include/asm/compat.h1
-rw-r--r--arch/sparc/include/asm/compat.h1
-rw-r--r--arch/tile/include/asm/compat.h1
-rw-r--r--arch/x86/include/asm/compat.h1
-rw-r--r--fs/fcntl.c11
9 files changed, 5 insertions, 14 deletions
diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h
index e39d487bf724..a3c7f271ad4c 100644
--- a/arch/arm64/include/asm/compat.h
+++ b/arch/arm64/include/asm/compat.h
@@ -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
diff --git a/arch/mips/include/asm/compat.h b/arch/mips/include/asm/compat.h
index 8e2b5b556488..49691331ada4 100644
--- a/arch/mips/include/asm/compat.h
+++ b/arch/mips/include/asm/compat.h
@@ -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
diff --git a/arch/parisc/include/asm/compat.h b/arch/parisc/include/asm/compat.h
index 07f48827afda..acf8aa07cbe0 100644
--- a/arch/parisc/include/asm/compat.h
+++ b/arch/parisc/include/asm/compat.h
@@ -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;
diff --git a/arch/powerpc/include/asm/compat.h b/arch/powerpc/include/asm/compat.h
index a035b1e5dfa7..8a2aecfe9b02 100644
--- a/arch/powerpc/include/asm/compat.h
+++ b/arch/powerpc/include/asm/compat.h
@@ -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
diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h
index 1b60eb3676d5..5e6a63641a5f 100644
--- a/arch/s390/include/asm/compat.h
+++ b/arch/s390/include/asm/compat.h
@@ -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
diff --git a/arch/sparc/include/asm/compat.h b/arch/sparc/include/asm/compat.h
index 977c3f280ba1..fa38c78de0f0 100644
--- a/arch/sparc/include/asm/compat.h
+++ b/arch/sparc/include/asm/compat.h
@@ -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
diff --git a/arch/tile/include/asm/compat.h b/arch/tile/include/asm/compat.h
index c14e36f008c8..62a7b83025dd 100644
--- a/arch/tile/include/asm/compat.h
+++ b/arch/tile/include/asm/compat.h
@@ -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;
diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h
index a600a6cda9ec..2cbd75dd2fd3 100644
--- a/arch/x86/include/asm/compat.h
+++ b/arch/x86/include/asm/compat.h
@@ -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;
diff --git a/fs/fcntl.c b/fs/fcntl.c
index e15bcc4265d0..0522e283a4f4 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -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: