* [2.29 COMMITED 1/2] Avoid ldbl-96 stack corruption from range reduction of pseudo-zero (bug 25487).
@ 2020-03-16 17:02 Patsy Griffin
0 siblings, 0 replies; only message in thread
From: Patsy Griffin @ 2020-03-16 17:02 UTC (permalink / raw)
From: Joseph Myers <email@example.com>
Bug 25487 reports stack corruption in ldbl-96 sinl on a pseudo-zero
argument (an representation where all the significand bits, including
the explicit high bit, are zero, but the exponent is not zero, which
is not a valid representation for the long double type).
Although this is not a valid long double representation, existing
practice in this area (see bug 4586, originally marked invalid but
subsequently fixed) is that we still seek to avoid invalid memory
accesses as a result, in case of programs that treat arbitrary binary
data as long double representations, although the invalid
representations of the ldbl-96 format do not need to be consistently
handled the same as any particular valid representation.
This patch makes the range reduction detect pseudo-zero and unnormal
representations that would otherwise go to __kernel_rem_pio2, and
returns a NaN for them instead of continuing with the range reduction
process. (Pseudo-zero and unnormal representations whose unbiased
exponent is less than -1 have already been safely returned from the
function before this point without going through the rest of range
reduction.) Pseudo-zero representations would previously result in
the value passed to __kernel_rem_pio2 being all-zero, which is
definitely unsafe; unnormal representations would previously result in
a value passed whose high bit is zero, which might well be unsafe
since that is not a form of input expected by __kernel_rem_pio2.
Tested for x86_64.
(cherry picked from commit 9333498794cde1d5cca518badf79533a24114b6f)
sysdeps/ieee754/ldbl-96/Makefile | 3 +-
sysdeps/ieee754/ldbl-96/e_rem_pio2l.c | 12 +++++++
sysdeps/ieee754/ldbl-96/test-sinl-pseudo.c | 41 ++++++++++++++++++++++
3 files changed, 55 insertions(+), 1 deletion(-)
create mode 100644 sysdeps/ieee754/ldbl-96/test-sinl-pseudo.c
diff --git a/sysdeps/ieee754/ldbl-96/Makefile
index b103254214..052c1c7703 100644
@@ -17,5 +17,6 @@
-tests += test-canonical-ldbl-96 test-totalorderl-ldbl-96
+tests += test-canonical-ldbl-96 test-totalorderl-ldbl-96 test-sinl-pseudo
+CFLAGS-test-sinl-pseudo.c += -fstack-protector-all
diff --git a/sysdeps/ieee754/ldbl-96/e_rem_pio2l.c
index 805de22d73..1aeccb47d7 100644
@@ -210,6 +210,18 @@ __ieee754_rem_pio2l (long double x, long double *y)
+ if ((i0 & 0x80000000) == 0)
+ /* Pseudo-zero and unnormal representations are not valid
+ representations of long double. We need to avoid stack
+ corruption in __kernel_rem_pio2, which expects input in a
+ particular normal form, but those representations do not need
+ to be consistently handled like any particular floating-point
+ value. */
+ y = y = __builtin_nanl ("");
+ return 0;
/* Split the 64 bits of the mantissa into three 24-bit integers
stored in a double array. */
exp = j0 - 23;
diff --git a/sysdeps/ieee754/ldbl-96/test-sinl-pseudo.c
new file mode 100644
@@ -0,0 +1,41 @@
+/* Test sinl for pseudo-zeros and unnormals for ldbl-96 (bug 25487).
+ Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+ for (int i = 0; i < 64; i++)
+ uint64_t sig = i == 63 ? 0 : 1ULL << i;
+ long double ld;
+ SET_LDOUBLE_WORDS (ld, 0x4141,
+ sig >> 32, sig & 0xffffffffULL);
+ /* The requirement is that no stack overflow occurs when the
+ pseudo-zero or unnormal goes through range reduction. */
+ volatile long double ldr;
+ ldr = sinl (ld);
+ (void) ldr;
+ return 0;
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2020-03-16 17:02 [2.29 COMMITED 1/2] Avoid ldbl-96 stack corruption from range reduction of pseudo-zero (bug 25487) Patsy Griffin
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