From cc5775c62f1f50c485181c16dc5e51677a7ba10e Mon Sep 17 00:00:00 2001
From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
Date: Tue, 6 Aug 2019 02:50:13 +0000
Subject: system/musl: [CVE] x87 FPU state fix

https://www.openwall.com/lists/oss-security/2019/08/06/1
---
 system/musl/x87-math.patch | 157 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 system/musl/x87-math.patch

(limited to 'system/musl/x87-math.patch')

diff --git a/system/musl/x87-math.patch b/system/musl/x87-math.patch
new file mode 100644
index 000000000..d21be43b3
--- /dev/null
+++ b/system/musl/x87-math.patch
@@ -0,0 +1,157 @@
+diff --git a/src/math/i386/asin.s b/src/math/i386/asin.s
+index a9f691bf..920d967a 100644
+--- a/src/math/i386/asin.s
++++ b/src/math/i386/asin.s
+@@ -7,13 +7,10 @@ asinf:
+ 	cmp $0x01000000,%eax
+ 	jae 1f
+ 		# subnormal x, return x with underflow
+-	fnstsw %ax
+-	and $16,%ax
+-	jnz 2f
+ 	fld %st(0)
+ 	fmul %st(1)
+ 	fstps 4(%esp)
+-2:	ret
++	ret
+ 
+ .global asinl
+ .type asinl,@function
+@@ -30,11 +27,8 @@ asin:
+ 	cmp $0x00200000,%eax
+ 	jae 1f
+ 		# subnormal x, return x with underflow
+-	fnstsw %ax
+-	and $16,%ax
+-	jnz 2f
+ 	fsts 4(%esp)
+-2:	ret
++	ret
+ 1:	fld %st(0)
+ 	fld1
+ 	fsub %st(0),%st(1)
+diff --git a/src/math/i386/atan.s b/src/math/i386/atan.s
+index d73137b2..a26feae1 100644
+--- a/src/math/i386/atan.s
++++ b/src/math/i386/atan.s
+@@ -10,8 +10,5 @@ atan:
+ 	fpatan
+ 	ret
+ 		# subnormal x, return x with underflow
+-1:	fnstsw %ax
+-	and $16,%ax
+-	jnz 2f
+-	fsts 4(%esp)
+-2:	ret
++1:	fsts 4(%esp)
++	ret
+diff --git a/src/math/i386/atan2.s b/src/math/i386/atan2.s
+index a7d2979b..76b95f31 100644
+--- a/src/math/i386/atan2.s
++++ b/src/math/i386/atan2.s
+@@ -10,8 +10,5 @@ atan2:
+ 	cmp $0x00200000,%eax
+ 	jae 1f
+ 		# subnormal x, return x with underflow
+-	fnstsw %ax
+-	and $16,%ax
+-	jnz 1f
+ 	fsts 4(%esp)
+ 1:	ret
+diff --git a/src/math/i386/atan2f.s b/src/math/i386/atan2f.s
+index 14b88ce5..c9408a90 100644
+--- a/src/math/i386/atan2f.s
++++ b/src/math/i386/atan2f.s
+@@ -10,9 +10,6 @@ atan2f:
+ 	cmp $0x01000000,%eax
+ 	jae 1f
+ 		# subnormal x, return x with underflow
+-	fnstsw %ax
+-	and $16,%ax
+-	jnz 1f
+ 	fld %st(0)
+ 	fmul %st(1)
+ 	fstps 4(%esp)
+diff --git a/src/math/i386/atanf.s b/src/math/i386/atanf.s
+index 8caddefa..893beac5 100644
+--- a/src/math/i386/atanf.s
++++ b/src/math/i386/atanf.s
+@@ -10,10 +10,7 @@ atanf:
+ 	fpatan
+ 	ret
+ 		# subnormal x, return x with underflow
+-1:	fnstsw %ax
+-	and $16,%ax
+-	jnz 2f
+-	fld %st(0)
++1:	fld %st(0)
+ 	fmul %st(1)
+ 	fstps 4(%esp)
+-2:	ret
++	ret
+diff --git a/src/math/i386/exp.s b/src/math/i386/exp.s
+index c7aa5b6e..df87c497 100644
+--- a/src/math/i386/exp.s
++++ b/src/math/i386/exp.s
+@@ -7,13 +7,10 @@ expm1f:
+ 	cmp $0x01000000,%eax
+ 	jae 1f
+ 		# subnormal x, return x with underflow
+-	fnstsw %ax
+-	and $16,%ax
+-	jnz 2f
+ 	fld %st(0)
+ 	fmul %st(1)
+ 	fstps 4(%esp)
+-2:	ret
++	ret
+ 
+ .global expm1l
+ .type expm1l,@function
+@@ -30,11 +27,8 @@ expm1:
+ 	cmp $0x00200000,%eax
+ 	jae 1f
+ 		# subnormal x, return x with underflow
+-	fnstsw %ax
+-	and $16,%ax
+-	jnz 2f
+ 	fsts 4(%esp)
+-2:	ret
++	ret
+ 1:	fldl2e
+ 	fmulp
+ 	mov $0xc2820000,%eax
+diff --git a/src/math/i386/log1p.s b/src/math/i386/log1p.s
+index 6b6929c7..354f391a 100644
+--- a/src/math/i386/log1p.s
++++ b/src/math/i386/log1p.s
+@@ -16,9 +16,6 @@ log1p:
+ 	fyl2x
+ 	ret
+ 		# subnormal x, return x with underflow
+-2:	fnstsw %ax
+-	and $16,%ax
+-	jnz 1f
+-	fsts 4(%esp)
++2:	fsts 4(%esp)
+ 	fstp %st(1)
+-1:	ret
++	ret
+diff --git a/src/math/i386/log1pf.s b/src/math/i386/log1pf.s
+index c0bcd30f..4d3484cd 100644
+--- a/src/math/i386/log1pf.s
++++ b/src/math/i386/log1pf.s
+@@ -16,10 +16,7 @@ log1pf:
+ 	fyl2x
+ 	ret
+ 		# subnormal x, return x with underflow
+-2:	fnstsw %ax
+-	and $16,%ax
+-	jnz 1f
+-	fxch
++2:	fxch
+ 	fmul %st(1)
+ 	fstps 4(%esp)
+-1:	ret
++	ret
+
-- 
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