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Groups > linux.kernel > #1635594
| From | Jiri Slaby <jslaby@suse.cz> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.12 11/86] metag/usercopy: Zero rest of buffer from copy_from_user |
| Date | 2017-05-04 11:30 +0200 |
| Message-ID | <tDlfe-1wD-69@gated-at.bofh.it> (permalink) |
| References | <tDkVQ-1oS-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: James Hogan <james.hogan@imgtec.com>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 563ddc1076109f2b3f88e6d355eab7b6fd4662cb upstream.
Currently we try to zero the destination for a failed read from userland
in fixup code in the usercopy.c macros. The rest of the destination
buffer is then zeroed from __copy_user_zeroing(), which is used for both
copy_from_user() and __copy_from_user().
Unfortunately we fail to zero in the fixup code as D1Ar1 is set to 0
before the fixup code entry labels, and __copy_from_user() shouldn't even
be zeroing the rest of the buffer.
Move the zeroing out into copy_from_user() and rename
__copy_user_zeroing() to raw_copy_from_user() since it no longer does
any zeroing. This also conveniently matches the name needed for
RAW_COPY_USER support in a later patch.
Fixes: 373cd784d0fc ("metag: Memory handling")
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
arch/metag/include/asm/uaccess.h | 15 ++++++-----
arch/metag/lib/usercopy.c | 57 +++++++++++++---------------------------
2 files changed, 26 insertions(+), 46 deletions(-)
diff --git a/arch/metag/include/asm/uaccess.h b/arch/metag/include/asm/uaccess.h
index 7841f2290385..9d523375f68a 100644
--- a/arch/metag/include/asm/uaccess.h
+++ b/arch/metag/include/asm/uaccess.h
@@ -192,20 +192,21 @@ extern long __must_check strnlen_user(const char __user *src, long count);
#define strlen_user(str) strnlen_user(str, 32767)
-extern unsigned long __must_check __copy_user_zeroing(void *to,
- const void __user *from,
- unsigned long n);
+extern unsigned long raw_copy_from_user(void *to, const void __user *from,
+ unsigned long n);
static inline unsigned long
copy_from_user(void *to, const void __user *from, unsigned long n)
{
+ unsigned long res = n;
if (likely(access_ok(VERIFY_READ, from, n)))
- return __copy_user_zeroing(to, from, n);
- memset(to, 0, n);
- return n;
+ res = raw_copy_from_user(to, from, n);
+ if (unlikely(res))
+ memset(to + (n - res), 0, res);
+ return res;
}
-#define __copy_from_user(to, from, n) __copy_user_zeroing(to, from, n)
+#define __copy_from_user(to, from, n) raw_copy_from_user(to, from, n)
#define __copy_from_user_inatomic __copy_from_user
extern unsigned long __must_check __copy_user(void __user *to,
diff --git a/arch/metag/lib/usercopy.c b/arch/metag/lib/usercopy.c
index 714d8562aa20..e1d553872fd7 100644
--- a/arch/metag/lib/usercopy.c
+++ b/arch/metag/lib/usercopy.c
@@ -29,7 +29,6 @@
COPY \
"1:\n" \
" .section .fixup,\"ax\"\n" \
- " MOV D1Ar1,#0\n" \
FIXUP \
" MOVT D1Ar1,#HI(1b)\n" \
" JUMP D1Ar1,#LO(1b)\n" \
@@ -637,16 +636,14 @@ EXPORT_SYMBOL(__copy_user);
__asm_copy_user_cont(to, from, ret, \
" GETB D1Ar1,[%1++]\n" \
"2: SETB [%0++],D1Ar1\n", \
- "3: ADD %2,%2,#1\n" \
- " SETB [%0++],D1Ar1\n", \
+ "3: ADD %2,%2,#1\n", \
" .long 2b,3b\n")
#define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
__asm_copy_user_cont(to, from, ret, \
" GETW D1Ar1,[%1++]\n" \
"2: SETW [%0++],D1Ar1\n" COPY, \
- "3: ADD %2,%2,#2\n" \
- " SETW [%0++],D1Ar1\n" FIXUP, \
+ "3: ADD %2,%2,#2\n" FIXUP, \
" .long 2b,3b\n" TENTRY)
#define __asm_copy_from_user_2(to, from, ret) \
@@ -656,32 +653,26 @@ EXPORT_SYMBOL(__copy_user);
__asm_copy_from_user_2x_cont(to, from, ret, \
" GETB D1Ar1,[%1++]\n" \
"4: SETB [%0++],D1Ar1\n", \
- "5: ADD %2,%2,#1\n" \
- " SETB [%0++],D1Ar1\n", \
+ "5: ADD %2,%2,#1\n", \
" .long 4b,5b\n")
#define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
__asm_copy_user_cont(to, from, ret, \
" GETD D1Ar1,[%1++]\n" \
"2: SETD [%0++],D1Ar1\n" COPY, \
- "3: ADD %2,%2,#4\n" \
- " SETD [%0++],D1Ar1\n" FIXUP, \
+ "3: ADD %2,%2,#4\n" FIXUP, \
" .long 2b,3b\n" TENTRY)
#define __asm_copy_from_user_4(to, from, ret) \
__asm_copy_from_user_4x_cont(to, from, ret, "", "", "")
-
#define __asm_copy_from_user_8x64(to, from, ret) \
asm volatile ( \
" GETL D0Ar2,D1Ar1,[%1++]\n" \
"2: SETL [%0++],D0Ar2,D1Ar1\n" \
"1:\n" \
" .section .fixup,\"ax\"\n" \
- " MOV D1Ar1,#0\n" \
- " MOV D0Ar2,#0\n" \
"3: ADD %2,%2,#8\n" \
- " SETL [%0++],D0Ar2,D1Ar1\n" \
" MOVT D0Ar2,#HI(1b)\n" \
" JUMP D0Ar2,#LO(1b)\n" \
" .previous\n" \
@@ -721,11 +712,12 @@ EXPORT_SYMBOL(__copy_user);
"SUB %1, %1, #4\n")
-/* Copy from user to kernel, zeroing the bytes that were inaccessible in
- userland. The return-value is the number of bytes that were
- inaccessible. */
-unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
- unsigned long n)
+/*
+ * Copy from user to kernel. The return-value is the number of bytes that were
+ * inaccessible.
+ */
+unsigned long raw_copy_from_user(void *pdst, const void __user *psrc,
+ unsigned long n)
{
register char *dst asm ("A0.2") = pdst;
register const char __user *src asm ("A1.2") = psrc;
@@ -738,7 +730,7 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
__asm_copy_from_user_1(dst, src, retn);
n--;
if (retn)
- goto copy_exception_bytes;
+ return retn + n;
}
if ((unsigned long) dst & 1) {
/* Worst case - byte copy */
@@ -746,14 +738,14 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
__asm_copy_from_user_1(dst, src, retn);
n--;
if (retn)
- goto copy_exception_bytes;
+ return retn + n;
}
}
if (((unsigned long) src & 2) && n >= 2) {
__asm_copy_from_user_2(dst, src, retn);
n -= 2;
if (retn)
- goto copy_exception_bytes;
+ return retn + n;
}
if ((unsigned long) dst & 2) {
/* Second worst case - word copy */
@@ -761,7 +753,7 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
__asm_copy_from_user_2(dst, src, retn);
n -= 2;
if (retn)
- goto copy_exception_bytes;
+ return retn + n;
}
}
@@ -777,7 +769,7 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
__asm_copy_from_user_8x64(dst, src, retn);
n -= 8;
if (retn)
- goto copy_exception_bytes;
+ return retn + n;
}
}
@@ -793,7 +785,7 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
__asm_copy_from_user_8x64(dst, src, retn);
n -= 8;
if (retn)
- goto copy_exception_bytes;
+ return retn + n;
}
}
#endif
@@ -803,7 +795,7 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
n -= 4;
if (retn)
- goto copy_exception_bytes;
+ return retn + n;
}
/* If we get here, there were no memory read faults. */
@@ -829,21 +821,8 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
/* If we get here, retn correctly reflects the number of failing
bytes. */
return retn;
-
- copy_exception_bytes:
- /* We already have "retn" bytes cleared, and need to clear the
- remaining "n" bytes. A non-optimized simple byte-for-byte in-line
- memset is preferred here, since this isn't speed-critical code and
- we'd rather have this a leaf-function than calling memset. */
- {
- char *endp;
- for (endp = dst + n; dst < endp; dst++)
- *dst = 0;
- }
-
- return retn + n;
}
-EXPORT_SYMBOL(__copy_user_zeroing);
+EXPORT_SYMBOL(raw_copy_from_user);
#define __asm_clear_8x64(to, ret) \
asm volatile ( \
--
2.12.2
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[PATCH 3.12 00/86] 3.12.74-stable review Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:10 +0200
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[PATCH 3.12 04/86] drm/vmwgfx: fix integer overflow in vmw_surface_define_ioctl() Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:10 +0200
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[PATCH 3.12 64/86] net/packet: fix overflow in check for tp_reserve Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 76/86] ext4: check if in-inode xattr is corrupted in ext4_expand_extra_isize_ea() Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
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[PATCH 3.12 42/86] rtl8150: Use heap buffers for all register access Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 30/86] scsi: sd: Fix capacity calculation with 32-bit sector_t Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 39/86] mm: Tighten x86 /dev/mem with zeroing reads Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 43/86] catc: Combine failure cleanup code in catc_probe() Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
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[PATCH 3.12 40/86] virtio-console: avoid DMA from stack Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 69/86] net: neigh: guard against NULL solicit() method Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 49/86] tracing: Allocate the snapshot buffer before enabling probe Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
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[PATCH 3.12 62/86] ping: implement proper locking Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 79/86] RDS: Fix the atomicity for congestion map update Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 84/86] Input: i8042 - add Clevo P650RS to the i8042 reset list Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 52/86] CIFS: remove bad_network_name flag Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 54/86] Drivers: hv: get rid of timeout in vmbus_open() Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 47/86] KEYS: Change the name of the dead type to ".dead" to prevent user access Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 41/86] pegasus: Use heap buffers for all register access Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 37/86] ext4: fix inode checksum calculation problem if i_extra_size is small Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 38/86] platform/x86: acer-wmi: setup accelerometer when machine has appropriate notify event Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 71/86] l2tp: take reference on sessions being dumped Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 68/86] gfs2: avoid uninitialized variable warning Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 70/86] net: phy: handle state correctly in phy_stop_machine Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 58/86] x86/mce/AMD: Give a name to MCA bank 3 when accessed with legacy MSRs Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 73/86] sctp: listen on the sock only when it's state is listening or closed Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:20 +0200
[PATCH 3.12 18/86] usb: dwc3: gadget: delay unmap of bounced requests Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 32/86] char: Drop bogus dependency of DEVPORT on !M68K Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 36/86] dvb-usb-v2: avoid use-after-free Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 14/86] metag/usercopy: Add missing fixups Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 10/86] metag/usercopy: Add early abort to copy_to_user Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 21/86] usb: hub: Wait for connection to be reestablished after port reset Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 13/86] metag/usercopy: Fix src fixup in from user rapf loops Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 23/86] net/mlx4_core: Fix racy CQ (Completion Queue) free Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 34/86] zram: do not use copy_page with non-page aligned address Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 19/86] mtd: bcm47xxpart: fix parsing first block after aligned TRX Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 16/86] s390/decompressor: fix initrd corruption caused by bss clear Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 08/86] metag/usercopy: Drop unused macros Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 24/86] Input: xpad - add support for Razer Wildcat gamepad Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 44/86] catc: Use heap buffer for memory size test Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 35/86] powerpc: Disable HFSCR[TM] if TM is not supported Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 15/86] powerpc: Don't try to fix up misaligned load-with-reservation instructions Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 07/86] ring-buffer: Fix return value check in test_ringbuffer() Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 17/86] mm/mempolicy.c: fix error handling in set_mempolicy and mbind. Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 09/86] metag/usercopy: Fix alignment error checking Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 22/86] net/mlx4_en: Fix bad WQE issue Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 20/86] net/packet: fix overflow in check for priv area size Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 12/86] metag/usercopy: Set flags before ADDZ Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
[PATCH 3.12 11/86] metag/usercopy: Zero rest of buffer from copy_from_user Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
Re: [PATCH 3.12 00/86] 3.12.74-stable review Jiri Slaby <jslaby@suse.cz> - 2017-05-04 11:30 +0200
Re: [PATCH 3.12 00/86] 3.12.74-stable review Guenter Roeck <linux@roeck-us.net> - 2017-05-04 18:00 +0200
Re: [PATCH 3.12 00/86] 3.12.74-stable review Jiri Slaby <jslaby@suse.cz> - 2017-05-09 21:00 +0200
Re: [PATCH 3.12 00/86] 3.12.74-stable review Shuah Khan <shuahkh@osg.samsung.com> - 2017-05-04 21:00 +0200
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