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arm: CVE-2020-6096: Fix multiarch memcpy for negative length [BZ #25620]

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Unsigned branch instructions could be used for r2 to fix the wrong
behavior when a negative length is passed to memcpy.
This commit fixes the armv7 version.

(cherry picked from commit beea361050)
This commit is contained in:
Alexander Anisimov 2020-07-08 14:18:31 +02:00 committed by Patsy Franklin
parent 9bbd2b6172
commit 64246fccaf
1 changed files with 11 additions and 11 deletions
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22
sysdeps/arm/armv7/multiarch/memcpy_impl.S
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@ -268,7 +268,7 @@ ENTRY(memcpy)
mov dst, dstin /* Preserve dstin, we need to return it. */
cmp count, #64
bge .Lcpy_not_short
bhs .Lcpy_not_short
/* Deal with small copies quickly by dropping straight into the
exit block. */
@ -351,10 +351,10 @@ ENTRY(memcpy)
1:
subs tmp2, count, #64 /* Use tmp2 for count. */
blt .Ltail63aligned
blo .Ltail63aligned
cmp tmp2, #512
bge .Lcpy_body_long
bhs .Lcpy_body_long
.Lcpy_body_medium: /* Count in tmp2. */
#ifdef USE_VFP
@ -378,7 +378,7 @@ ENTRY(memcpy)
add src, src, #64
vstr d1, [dst, #56]
add dst, dst, #64
bge 1b
bhs 1b
tst tmp2, #0x3f
beq .Ldone
@ -412,7 +412,7 @@ ENTRY(memcpy)
ldrd A_l, A_h, [src, #64]!
strd A_l, A_h, [dst, #64]!
subs tmp2, tmp2, #64
bge 1b
bhs 1b
tst tmp2, #0x3f
bne 1f
ldr tmp2,[sp], #FRAME_SIZE
@ -482,7 +482,7 @@ ENTRY(memcpy)
add src, src, #32
subs tmp2, tmp2, #prefetch_lines * 64 * 2
blt 2f
blo 2f
1:
cpy_line_vfp d3, 0
cpy_line_vfp d4, 64
@ -494,7 +494,7 @@ ENTRY(memcpy)
add dst, dst, #2 * 64
add src, src, #2 * 64
subs tmp2, tmp2, #prefetch_lines * 64
bge 1b
bhs 1b
2:
cpy_tail_vfp d3, 0
@ -615,8 +615,8 @@ ENTRY(memcpy)
1:
pld [src, #(3 * 64)]
subs count, count, #64
ldrmi tmp2, [sp], #FRAME_SIZE
bmi .Ltail63unaligned
ldrlo tmp2, [sp], #FRAME_SIZE
blo .Ltail63unaligned
pld [src, #(4 * 64)]
#ifdef USE_NEON
@ -633,7 +633,7 @@ ENTRY(memcpy)
neon_load_multi d0-d3, src
neon_load_multi d4-d7, src
subs count, count, #64
bmi 2f
blo 2f
1:
pld [src, #(4 * 64)]
neon_store_multi d0-d3, dst
@ -641,7 +641,7 @@ ENTRY(memcpy)
neon_store_multi d4-d7, dst
neon_load_multi d4-d7, src
subs count, count, #64
bpl 1b
bhs 1b
2:
neon_store_multi d0-d3, dst
neon_store_multi d4-d7, dst