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Check the magic value in longjmp() before calling sigprocmask().

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This avoids passing garbage to sigprocmask() if the jump buffer is
invalid.

Reviewed by:	mhorne
Obtained from:	CheriBSD
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D24483
This commit is contained in:
John Baldwin 2020-04-21 17:40:23 +00:00
parent 5c4309b474
commit 5e61abf740
1 changed files with 5 additions and 5 deletions
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10
lib/libc/riscv/gen/setjmp.S
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@ -100,6 +100,11 @@ ENTRY(setjmp)
END(setjmp)
ENTRY(longjmp)
/* Check the magic value */
ld t0, 0(a0)
ld t1, .Lmagic
bne t0, t1, botch
addi sp, sp, -(4 * 8)
sd a0, (0 * 8)(sp)
sd ra, (1 * 8)(sp)
@ -116,11 +121,6 @@ ENTRY(longjmp)
ld a0, (0 * 8)(sp)
addi sp, sp, (4 * 8)
/* Check the magic value */
ld t0, 0(a0)
ld t1, .Lmagic
bne t0, t1, botch
/* Restore the stack pointer */
ld t0, 8(a0)
mv sp, t0