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author | Mike Frysinger <vapier@gentoo.org> | 2013-12-29 21:16:25 +0000 |
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committer | Mike Frysinger <vapier@gentoo.org> | 2013-12-30 23:12:16 -0500 |
commit | 98b78b4b72131264b1950edbcd94287041ec8311 (patch) | |
tree | febc663314bcf3ea0680513b11d0db1464bb2820 /ports/sysdeps/unix/sysv/linux/ia64 | |
parent | e646a161cef3069fe1a6c92b750a87350630c62d (diff) | |
download | glibc-98b78b4b72131264b1950edbcd94287041ec8311.tar.gz glibc-98b78b4b72131264b1950edbcd94287041ec8311.tar.xz glibc-98b78b4b72131264b1950edbcd94287041ec8311.zip |
ia64: longjmp_chk: support signal stacks [BZ #16372]
The sp check has to be moved up to the start of the func since it now makes a system call and that'll clobber a lot of registers. URL: https://sourceware.org/bugzilla/show_bug.cgi?id=16372 Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/ia64')
4 files changed, 71 insertions, 12 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/ia64/Makefile b/ports/sysdeps/unix/sysv/linux/ia64/Makefile index d9a35a7c67..bbfd6a2392 100644 --- a/ports/sysdeps/unix/sysv/linux/ia64/Makefile +++ b/ports/sysdeps/unix/sysv/linux/ia64/Makefile @@ -10,6 +10,7 @@ endif ifeq ($(subdir),misc) sysdep_headers += sys/io.h sysdep_routines += ioperm clone2 +gen-as-const-headers += sigaltstack-offsets.sym endif ifeq ($(subdir),elf) diff --git a/ports/sysdeps/unix/sysv/linux/ia64/____longjmp_chk.S b/ports/sysdeps/unix/sysv/linux/ia64/____longjmp_chk.S index f4ce5d3a3c..ccaf3ccf84 100644 --- a/ports/sysdeps/unix/sysv/linux/ia64/____longjmp_chk.S +++ b/ports/sysdeps/unix/sysv/linux/ia64/____longjmp_chk.S @@ -15,6 +15,8 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ +#include <sigaltstack-offsets.h> + .section .rodata.str1.8,"aMS",@progbits,1 .align 8 .LC0: @@ -29,13 +31,58 @@ longjmp_msg: #define __longjmp ____longjmp_chk -#define CHECK_RSP(reg) \ - cmp.ltu p0, p8 = reg, r12; \ -(p8) br.cond.dpnt .Lok;; \ - addl r28 = @ltoffx(longjmp_msg#), r1;; \ - ld8.mov r28 = [r28], longjmp_msg#;; \ - ld8 out0 = [r28]; \ +/* We use 32 bytes (rather than sizeof(stack_t)) so that we keep the stack + properly aligned. But we still want a sanity check to make sure 32 is + actually enough. */ +#define STACK_SPACE ((sizeSS + 31) & -32) + +/* Check the stack pointer held in the jumpbuf. Make sure it's in either the + current stack (r12) or in the signal stack. */ +#define CHECK_RSP \ + ld8 loc0 = [in0]; \ + ;; \ + /* First see if target stack is within current one. */ \ + cmp.ltu p0, p8 = loc0, r12; \ +(p8) br.cond.dptk.many .Lok; \ + \ + /* Check if it's an alternative signal stack. */ \ + mov out0 = r0; \ + add out1 = -STACK_SPACE, r12; \ + ;; \ + mov r12 = out1; \ + DO_CALL_VIA_BREAK (SYS_ify (sigaltstack)); \ + ;; \ + /* If the syscall failed, then assume it's OK. */ \ + cmp.eq p8, p0 = -1, r10; \ +(p8) br.cond.spnt .Lok; \ + /* Move stack_t into regs. */ \ + add r14 = oSS_FLAGS, r12; /* ss_flags */ \ + add r15 = oSS_SIZE, r12; /* ss_size */ \ + ld8 r16 = [r12]; /* ss_sp */ \ + ;; \ + ld4 r17 = [r14]; /* ss_flags */ \ + ld8 r18 = [r15]; /* ss_size */ \ + ;; \ + sub r19 = r16, r18; /* sp - size */ \ + /* See if we're currently on the altstack. */ \ + tbit.nz p0, p8 = r17, 0; /* SS_ONSTACK */ \ +(p8) br.cond.spnt .Lfail; \ + /* Verify target is within alternative stack. */ \ + cmp.gtu p7, p0 = loc0, r16; \ +(p7) br.cond.spnt .Lfail; \ + ;; \ + cmp.ltu p0, p8 = loc0, r19; \ +(p8) br.cond.sptk.many .Lok; \ + ;; \ + \ + /* Still here? Abort! */ \ +.Lfail: \ + add r12 = STACK_SPACE, r12; \ + addl loc0 = @ltoffx(longjmp_msg#), r1;; \ + ld8.mov loc0 = [loc0], longjmp_msg#;; \ + ld8 out0 = [loc0]; \ br.call.sptk.many b0 = HIDDEN_JUMPTARGET(__fortify_fail)#;; \ -.Lok: +.Lok: \ + add r12 = STACK_SPACE, r12; #include "__longjmp.S" diff --git a/ports/sysdeps/unix/sysv/linux/ia64/__longjmp.S b/ports/sysdeps/unix/sysv/linux/ia64/__longjmp.S index 4860a8caef..4968802ae9 100644 --- a/ports/sysdeps/unix/sysv/linux/ia64/__longjmp.S +++ b/ports/sysdeps/unix/sysv/linux/ia64/__longjmp.S @@ -42,9 +42,10 @@ LEAF(__longjmp) #ifdef CHECK_RSP - alloc r8=ar.pfs,2,1,1,0 + alloc r8=ar.pfs,2,1,3,0 + CHECK_RSP #else - alloc r8=ar.pfs,2,1,0,0 + alloc r8=ar.pfs,2,0,0,0 #endif mov r27=ar.rsc add r2=0x98,in0 // r2 <- &jmpbuf.orig_jmp_buf_addr @@ -79,9 +80,6 @@ LEAF(__longjmp) mov r26=ar.rnat mov ar.unat=r25 // setup ar.unat (NaT bits for r1, r4-r7, and r12) ;; -#ifdef CHECK_RSP - CHECK_RSP (r28) -#endif ld8.fill.nta gp=[r3],32 // r1 (gp) dep r11=-1,r23,3,6 // r11 <- ia64_rse_rnat_addr(jmpbuf.ar_bsp) mov sp=r28 // r12 (sp) diff --git a/ports/sysdeps/unix/sysv/linux/ia64/sigaltstack-offsets.sym b/ports/sysdeps/unix/sysv/linux/ia64/sigaltstack-offsets.sym new file mode 100644 index 0000000000..f73446941a --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/ia64/sigaltstack-offsets.sym @@ -0,0 +1,13 @@ +#include <stddef.h> +#include <signal.h> + +-- + +#define sigaltstack(member) offsetof (stack_t, member) + +sizeSS sizeof (stack_t) +oSS_SP sigaltstack (ss_sp) +oSS_FLAGS sigaltstack (ss_flags) +oSS_SIZE sigaltstack (ss_size) + +SS_ONSTACK |