--- /dev/null
+From 4b8e88e563b5f666446d002ad0dc1e6e8e7102b0 Mon Sep 17 00:00:00 2001
+From: Arnd Bergmann <arnd@arndb.de>
+Date: Wed, 19 Jun 2024 11:34:09 +0200
+Subject: ftruncate: pass a signed offset
+
+From: Arnd Bergmann <arnd@arndb.de>
+
+commit 4b8e88e563b5f666446d002ad0dc1e6e8e7102b0 upstream.
+
+The old ftruncate() syscall, using the 32-bit off_t misses a sign
+extension when called in compat mode on 64-bit architectures. As a
+result, passing a negative length accidentally succeeds in truncating
+to file size between 2GiB and 4GiB.
+
+Changing the type of the compat syscall to the signed compat_off_t
+changes the behavior so it instead returns -EINVAL.
+
+The native entry point, the truncate() syscall and the corresponding
+loff_t based variants are all correct already and do not suffer
+from this mistake.
+
+Fixes: 3f6d078d4acc ("fix compat truncate/ftruncate")
+Reviewed-by: Christian Brauner <brauner@kernel.org>
+Cc: stable@vger.kernel.org
+Signed-off-by: Arnd Bergmann <arnd@arndb.de>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/open.c | 4 ++--
+ include/linux/compat.h | 2 +-
+ include/linux/syscalls.h | 2 +-
+ 3 files changed, 4 insertions(+), 4 deletions(-)
+
+--- a/fs/open.c
++++ b/fs/open.c
+@@ -199,13 +199,13 @@ out:
+ return error;
+ }
+
+-SYSCALL_DEFINE2(ftruncate, unsigned int, fd, unsigned long, length)
++SYSCALL_DEFINE2(ftruncate, unsigned int, fd, off_t, length)
+ {
+ return do_sys_ftruncate(fd, length, 1);
+ }
+
+ #ifdef CONFIG_COMPAT
+-COMPAT_SYSCALL_DEFINE2(ftruncate, unsigned int, fd, compat_ulong_t, length)
++COMPAT_SYSCALL_DEFINE2(ftruncate, unsigned int, fd, compat_off_t, length)
+ {
+ return do_sys_ftruncate(fd, length, 1);
+ }
+--- a/include/linux/compat.h
++++ b/include/linux/compat.h
+@@ -621,7 +621,7 @@ asmlinkage long compat_sys_fstatfs(unsig
+ asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
+ struct compat_statfs64 __user *buf);
+ asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
+-asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
++asmlinkage long compat_sys_ftruncate(unsigned int, compat_off_t);
+ /* No generic prototype for truncate64, ftruncate64, fallocate */
+ asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
+ int flags, umode_t mode);
+--- a/include/linux/syscalls.h
++++ b/include/linux/syscalls.h
+@@ -450,7 +450,7 @@ asmlinkage long sys_fstatfs(unsigned int
+ asmlinkage long sys_fstatfs64(unsigned int fd, size_t sz,
+ struct statfs64 __user *buf);
+ asmlinkage long sys_truncate(const char __user *path, long length);
+-asmlinkage long sys_ftruncate(unsigned int fd, unsigned long length);
++asmlinkage long sys_ftruncate(unsigned int fd, off_t length);
+ #if BITS_PER_LONG == 32
+ asmlinkage long sys_truncate64(const char __user *path, loff_t length);
+ asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length);
--- /dev/null
+From d3882564a77c21eb746ba5364f3fa89b88de3d61 Mon Sep 17 00:00:00 2001
+From: Arnd Bergmann <arnd@arndb.de>
+Date: Thu, 20 Jun 2024 14:16:37 +0200
+Subject: syscalls: fix compat_sys_io_pgetevents_time64 usage
+
+From: Arnd Bergmann <arnd@arndb.de>
+
+commit d3882564a77c21eb746ba5364f3fa89b88de3d61 upstream.
+
+Using sys_io_pgetevents() as the entry point for compat mode tasks
+works almost correctly, but misses the sign extension for the min_nr
+and nr arguments.
+
+This was addressed on parisc by switching to
+compat_sys_io_pgetevents_time64() in commit 6431e92fc827 ("parisc:
+io_pgetevents_time64() needs compat syscall in 32-bit compat mode"),
+as well as by using more sophisticated system call wrappers on x86 and
+s390. However, arm64, mips, powerpc, sparc and riscv still have the
+same bug.
+
+Change all of them over to use compat_sys_io_pgetevents_time64()
+like parisc already does. This was clearly the intention when the
+function was originally added, but it got hooked up incorrectly in
+the tables.
+
+Cc: stable@vger.kernel.org
+Fixes: 48166e6ea47d ("y2038: add 64-bit time_t syscalls to all 32-bit architectures")
+Acked-by: Heiko Carstens <hca@linux.ibm.com> # s390
+Signed-off-by: Arnd Bergmann <arnd@arndb.de>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/arm64/include/asm/unistd32.h | 2 +-
+ arch/mips/kernel/syscalls/syscall_n32.tbl | 2 +-
+ arch/mips/kernel/syscalls/syscall_o32.tbl | 2 +-
+ arch/powerpc/kernel/syscalls/syscall.tbl | 2 +-
+ arch/s390/kernel/syscalls/syscall.tbl | 2 +-
+ arch/sparc/kernel/syscalls/syscall.tbl | 2 +-
+ arch/x86/entry/syscalls/syscall_32.tbl | 2 +-
+ include/uapi/asm-generic/unistd.h | 2 +-
+ kernel/sys_ni.c | 2 +-
+ 9 files changed, 9 insertions(+), 9 deletions(-)
+
+--- a/arch/arm64/include/asm/unistd32.h
++++ b/arch/arm64/include/asm/unistd32.h
+@@ -840,7 +840,7 @@ __SYSCALL(__NR_pselect6_time64, compat_s
+ #define __NR_ppoll_time64 414
+ __SYSCALL(__NR_ppoll_time64, compat_sys_ppoll_time64)
+ #define __NR_io_pgetevents_time64 416
+-__SYSCALL(__NR_io_pgetevents_time64, sys_io_pgetevents)
++__SYSCALL(__NR_io_pgetevents_time64, compat_sys_io_pgetevents_time64)
+ #define __NR_recvmmsg_time64 417
+ __SYSCALL(__NR_recvmmsg_time64, compat_sys_recvmmsg_time64)
+ #define __NR_mq_timedsend_time64 418
+--- a/arch/mips/kernel/syscalls/syscall_n32.tbl
++++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
+@@ -354,7 +354,7 @@
+ 412 n32 utimensat_time64 sys_utimensat
+ 413 n32 pselect6_time64 compat_sys_pselect6_time64
+ 414 n32 ppoll_time64 compat_sys_ppoll_time64
+-416 n32 io_pgetevents_time64 sys_io_pgetevents
++416 n32 io_pgetevents_time64 compat_sys_io_pgetevents_time64
+ 417 n32 recvmmsg_time64 compat_sys_recvmmsg_time64
+ 418 n32 mq_timedsend_time64 sys_mq_timedsend
+ 419 n32 mq_timedreceive_time64 sys_mq_timedreceive
+--- a/arch/mips/kernel/syscalls/syscall_o32.tbl
++++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
+@@ -403,7 +403,7 @@
+ 412 o32 utimensat_time64 sys_utimensat sys_utimensat
+ 413 o32 pselect6_time64 sys_pselect6 compat_sys_pselect6_time64
+ 414 o32 ppoll_time64 sys_ppoll compat_sys_ppoll_time64
+-416 o32 io_pgetevents_time64 sys_io_pgetevents sys_io_pgetevents
++416 o32 io_pgetevents_time64 sys_io_pgetevents compat_sys_io_pgetevents_time64
+ 417 o32 recvmmsg_time64 sys_recvmmsg compat_sys_recvmmsg_time64
+ 418 o32 mq_timedsend_time64 sys_mq_timedsend sys_mq_timedsend
+ 419 o32 mq_timedreceive_time64 sys_mq_timedreceive sys_mq_timedreceive
+--- a/arch/powerpc/kernel/syscalls/syscall.tbl
++++ b/arch/powerpc/kernel/syscalls/syscall.tbl
+@@ -506,7 +506,7 @@
+ 412 32 utimensat_time64 sys_utimensat sys_utimensat
+ 413 32 pselect6_time64 sys_pselect6 compat_sys_pselect6_time64
+ 414 32 ppoll_time64 sys_ppoll compat_sys_ppoll_time64
+-416 32 io_pgetevents_time64 sys_io_pgetevents sys_io_pgetevents
++416 32 io_pgetevents_time64 sys_io_pgetevents compat_sys_io_pgetevents_time64
+ 417 32 recvmmsg_time64 sys_recvmmsg compat_sys_recvmmsg_time64
+ 418 32 mq_timedsend_time64 sys_mq_timedsend sys_mq_timedsend
+ 419 32 mq_timedreceive_time64 sys_mq_timedreceive sys_mq_timedreceive
+--- a/arch/s390/kernel/syscalls/syscall.tbl
++++ b/arch/s390/kernel/syscalls/syscall.tbl
+@@ -418,7 +418,7 @@
+ 412 32 utimensat_time64 - sys_utimensat
+ 413 32 pselect6_time64 - compat_sys_pselect6_time64
+ 414 32 ppoll_time64 - compat_sys_ppoll_time64
+-416 32 io_pgetevents_time64 - sys_io_pgetevents
++416 32 io_pgetevents_time64 - compat_sys_io_pgetevents_time64
+ 417 32 recvmmsg_time64 - compat_sys_recvmmsg_time64
+ 418 32 mq_timedsend_time64 - sys_mq_timedsend
+ 419 32 mq_timedreceive_time64 - sys_mq_timedreceive
+--- a/arch/sparc/kernel/syscalls/syscall.tbl
++++ b/arch/sparc/kernel/syscalls/syscall.tbl
+@@ -461,7 +461,7 @@
+ 412 32 utimensat_time64 sys_utimensat sys_utimensat
+ 413 32 pselect6_time64 sys_pselect6 compat_sys_pselect6_time64
+ 414 32 ppoll_time64 sys_ppoll compat_sys_ppoll_time64
+-416 32 io_pgetevents_time64 sys_io_pgetevents sys_io_pgetevents
++416 32 io_pgetevents_time64 sys_io_pgetevents compat_sys_io_pgetevents_time64
+ 417 32 recvmmsg_time64 sys_recvmmsg compat_sys_recvmmsg_time64
+ 418 32 mq_timedsend_time64 sys_mq_timedsend sys_mq_timedsend
+ 419 32 mq_timedreceive_time64 sys_mq_timedreceive sys_mq_timedreceive
+--- a/arch/x86/entry/syscalls/syscall_32.tbl
++++ b/arch/x86/entry/syscalls/syscall_32.tbl
+@@ -420,7 +420,7 @@
+ 412 i386 utimensat_time64 sys_utimensat
+ 413 i386 pselect6_time64 sys_pselect6 compat_sys_pselect6_time64
+ 414 i386 ppoll_time64 sys_ppoll compat_sys_ppoll_time64
+-416 i386 io_pgetevents_time64 sys_io_pgetevents
++416 i386 io_pgetevents_time64 sys_io_pgetevents compat_sys_io_pgetevents_time64
+ 417 i386 recvmmsg_time64 sys_recvmmsg compat_sys_recvmmsg_time64
+ 418 i386 mq_timedsend_time64 sys_mq_timedsend
+ 419 i386 mq_timedreceive_time64 sys_mq_timedreceive
+--- a/include/uapi/asm-generic/unistd.h
++++ b/include/uapi/asm-generic/unistd.h
+@@ -805,7 +805,7 @@ __SC_COMP(__NR_pselect6_time64, sys_psel
+ #define __NR_ppoll_time64 414
+ __SC_COMP(__NR_ppoll_time64, sys_ppoll, compat_sys_ppoll_time64)
+ #define __NR_io_pgetevents_time64 416
+-__SYSCALL(__NR_io_pgetevents_time64, sys_io_pgetevents)
++__SC_COMP(__NR_io_pgetevents_time64, sys_io_pgetevents, compat_sys_io_pgetevents_time64)
+ #define __NR_recvmmsg_time64 417
+ __SC_COMP(__NR_recvmmsg_time64, sys_recvmmsg, compat_sys_recvmmsg_time64)
+ #define __NR_mq_timedsend_time64 418
+--- a/kernel/sys_ni.c
++++ b/kernel/sys_ni.c
+@@ -46,8 +46,8 @@ COND_SYSCALL(io_getevents_time32);
+ COND_SYSCALL(io_getevents);
+ COND_SYSCALL(io_pgetevents_time32);
+ COND_SYSCALL(io_pgetevents);
+-COND_SYSCALL_COMPAT(io_pgetevents_time32);
+ COND_SYSCALL_COMPAT(io_pgetevents);
++COND_SYSCALL_COMPAT(io_pgetevents_time64);
+ COND_SYSCALL(io_uring_setup);
+ COND_SYSCALL(io_uring_enter);
+ COND_SYSCALL(io_uring_register);
projects / thirdparty / kernel / stable-queue.git / commitdiff
