__io_compat_recvmsg_copy_hdr() with REQ_F_BUFFER_SELECT reads out iov
len but never assigns it to iov/fast_iov, leaving sr->len with garbage.
Hopefully, following io_buffer_select() truncates it to the selected
buffer size, but the value is still may be under what was specified.
Cc: <stable(a)vger.kernel.org> # 5.7
Signed-off-by: Pavel Begunkov <asml.silence(a)gmail.com>
---
fs/io_uring.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 1023f7b44cea..a2a7c65a77aa 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4499,7 +4499,8 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
return -EFAULT;
if (clen < 0)
return -EINVAL;
- sr->len = iomsg->iov[0].iov_len;
+ sr->len = clen;
+ iomsg->iov[0].iov_len = clen;
iomsg->iov = NULL;
} else {
ret = __import_iovec(READ, (struct iovec __user *)uiov, len,
--
2.24.0
The patch titled
Subject: proc: use untagged_addr() for pagemap_read addresses
has been added to the -mm tree. Its filename is
proc-use-untagged_addr-for-pagemap_read-addresses.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/proc-use-untagged_addr-for-pagema…
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/proc-use-untagged_addr-for-pagema…
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Miles Chen <miles.chen(a)mediatek.com>
Subject: proc: use untagged_addr() for pagemap_read addresses
When we try to visit the pagemap of a tagged userspace pointer, we find
that the start_vaddr is not correct because of the tag. To fix it, we
should untag the usespace pointers in pagemap_read().
I tested with 5.10-rc4 and the issue remains.
Explanation from Catalin in [1]:
: Arguably, that's a user-space bug since tagged file offsets were never
: supported. In this case it's not even a tag at bit 56 as per the arm64
: tagged address ABI but rather down to bit 47. You could say that the
: problem is caused by the C library (malloc()) or whoever created the
: tagged vaddr and passed it to this function. It's not a kernel regression
: as we've never supported it.
:
: Now, pagemap is a special case where the offset is usually not generated
: as a classic file offset but rather derived by shifting a user virtual
: address. I guess we can make a concession for pagemap (only) and allow
: such offset with the tag at bit (56 - PAGE_SHIFT + 3).
My test code is baed on [2]:
A userspace pointer which has been tagged by 0xb4: 0xb400007662f541c8
=== userspace program ===
uint64 OsLayer::VirtualToPhysical(void *vaddr) {
uint64 frame, paddr, pfnmask, pagemask;
int pagesize = sysconf(_SC_PAGESIZE);
off64_t off = ((uintptr_t)vaddr) / pagesize * 8; // off = 0xb400007662f541c8 / pagesize * 8 = 0x5a00003b317aa0
int fd = open(kPagemapPath, O_RDONLY);
...
if (lseek64(fd, off, SEEK_SET) != off || read(fd, &frame, 8) != 8) {
int err = errno;
string errtxt = ErrorString(err);
if (fd >= 0)
close(fd);
return 0;
}
...
}
=== kernel fs/proc/task_mmu.c ===
static ssize_t pagemap_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
...
src = *ppos;
svpfn = src / PM_ENTRY_BYTES; // svpfn == 0xb400007662f54
start_vaddr = svpfn << PAGE_SHIFT; // start_vaddr == 0xb400007662f54000
end_vaddr = mm->task_size;
/* watch out for wraparound */
// svpfn == 0xb400007662f54
// (mm->task_size >> PAGE) == 0x8000000
if (svpfn > mm->task_size >> PAGE_SHIFT) // the condition is true because of the tag 0xb4
start_vaddr = end_vaddr;
ret = 0;
while (count && (start_vaddr < end_vaddr)) { // we cannot visit correct entry because start_vaddr is set to end_vaddr
int len;
unsigned long end;
...
}
...
}
[1] https://lore.kernel.org/patchwork/patch/1343258/
[2] https://github.com/stressapptest/stressapptest/blob/master/src/os.cc#L158
Link: https://lkml.kernel.org/r/20201127050738.14440-1-miles.chen@mediatek.com
Signed-off-by: Miles Chen <miles.chen(a)mediatek.com>
Cc: Alexey Dobriyan <adobriyan(a)gmail.com>
Cc: Andrey Konovalov <andreyknvl(a)google.com>
Cc: Alexander Potapenko <glider(a)google.com>
Cc: Vincenzo Frascino <vincenzo.frascino(a)arm.com>
Cc: Andrey Ryabinin <aryabinin(a)virtuozzo.com>
Cc: Catalin Marinas <catalin.marinas(a)arm.com>
Cc: Dmitry Vyukov <dvyukov(a)google.com>
Cc: Marco Elver <elver(a)google.com>
Cc: Will Deacon <will.deacon(a)arm.com>
Cc: Eric W. Biederman <ebiederm(a)xmission.com>
Cc: Song Bao Hua (Barry Song) <song.bao.hua(a)hisilicon.com>
Cc: <stable(a)vger.kernel.org> [5.4+]
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
fs/proc/task_mmu.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/fs/proc/task_mmu.c~proc-use-untagged_addr-for-pagemap_read-addresses
+++ a/fs/proc/task_mmu.c
@@ -1599,11 +1599,15 @@ static ssize_t pagemap_read(struct file
src = *ppos;
svpfn = src / PM_ENTRY_BYTES;
- start_vaddr = svpfn << PAGE_SHIFT;
end_vaddr = mm->task_size;
/* watch out for wraparound */
- if (svpfn > mm->task_size >> PAGE_SHIFT)
+ start_vaddr = end_vaddr;
+ if (svpfn < (ULONG_MAX >> PAGE_SHIFT))
+ start_vaddr = untagged_addr(svpfn << PAGE_SHIFT);
+
+ /* Ensure the address is inside the task */
+ if (start_vaddr > mm->task_size)
start_vaddr = end_vaddr;
/*
_
Patches currently in -mm which might be from miles.chen(a)mediatek.com are
proc-use-untagged_addr-for-pagemap_read-addresses.patch