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musl: Add unwinding protection in clone() implementations.
Whatever was in the frame pointer register prior to clone() will no longer be valid in the child process, so zero it to protect FP-based unwinders. This is just an extension of what was already done for i386 and x86_64. Only applied to architectures where the _start() code also zeroes the frame pointer.
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3
lib/libc/musl/src/thread/aarch64/clone.s
vendored
3
lib/libc/musl/src/thread/aarch64/clone.s
vendored
@ -24,7 +24,8 @@ __clone:
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// parent
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ret
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// child
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1: ldp x1,x0,[sp],#16
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1: mov fp, 0
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ldp x1,x0,[sp],#16
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blr x1
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mov x8,#93 // SYS_exit
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svc #0
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3
lib/libc/musl/src/thread/arm/clone.s
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3
lib/libc/musl/src/thread/arm/clone.s
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@ -19,7 +19,8 @@ __clone:
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ldmfd sp!,{r4,r5,r6,r7}
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bx lr
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1: mov r0,r6
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1: mov fp,#0
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mov r0,r6
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bl 3f
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2: mov r7,#1
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svc 0
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1
lib/libc/musl/src/thread/loongarch64/clone.s
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1
lib/libc/musl/src/thread/loongarch64/clone.s
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@ -22,6 +22,7 @@ __clone:
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beqz $a0, 1f # whether child process
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jirl $zero, $ra, 0 # parent process return
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1:
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move $fp, $zero
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ld.d $t8, $sp, 0 # function pointer
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ld.d $a0, $sp, 8 # argument pointer
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jirl $ra, $t8, 0 # call the user's function
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3
lib/libc/musl/src/thread/m68k/clone.s
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3
lib/libc/musl/src/thread/m68k/clone.s
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@ -18,7 +18,8 @@ __clone:
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beq 1f
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movem.l (%sp)+,%d2-%d5
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rts
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1: move.l %a1,-(%sp)
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1: suba.l %%fp,%%fp
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move.l %a1,-(%sp)
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jsr (%a0)
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move.l #1,%d0
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trap #0
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3
lib/libc/musl/src/thread/microblaze/clone.s
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3
lib/libc/musl/src/thread/microblaze/clone.s
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@ -22,7 +22,8 @@ __clone:
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rtsd r15, 8
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nop
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1: lwi r3, r1, 0
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1: add r19, r0, r0
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lwi r3, r1, 0
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lwi r5, r1, 4
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brald r15, r3
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nop
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3
lib/libc/musl/src/thread/mips/clone.s
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3
lib/libc/musl/src/thread/mips/clone.s
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@ -27,7 +27,8 @@ __clone:
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addu $sp, $sp, 16
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jr $ra
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nop
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1: lw $25, 0($sp)
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1: move $fp, $0
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lw $25, 0($sp)
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lw $4, 4($sp)
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jalr $25
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nop
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3
lib/libc/musl/src/thread/mips64/clone.s
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3
lib/libc/musl/src/thread/mips64/clone.s
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@ -25,7 +25,8 @@ __clone:
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nop
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jr $ra
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nop
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1: ld $25, 0($sp) # function pointer
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1: move $fp, $0
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ld $25, 0($sp) # function pointer
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ld $4, 8($sp) # argument pointer
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jalr $25 # call the user's function
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nop
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3
lib/libc/musl/src/thread/mipsn32/clone.s
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3
lib/libc/musl/src/thread/mipsn32/clone.s
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@ -25,7 +25,8 @@ __clone:
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nop
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jr $ra
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nop
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1: lw $25, 0($sp) # function pointer
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1: move $fp, $0
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lw $25, 0($sp) # function pointer
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lw $4, 4($sp) # argument pointer
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jalr $25 # call the user's function
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nop
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3
lib/libc/musl/src/thread/or1k/clone.s
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3
lib/libc/musl/src/thread/or1k/clone.s
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@ -23,7 +23,8 @@ __clone:
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l.jr r9
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l.nop
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1: l.lwz r11, 0(r1)
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1: l.ori r2, r0, 0
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l.lwz r11, 0(r1)
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l.jalr r11
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l.lwz r3, 4(r1)
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