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Code Editor : git-fix-longjmp.diff
Committed for glibc 2.32 commit 115bcf921a52005b89ff2859ccae4a8fc6d6deed Author: Samuel Thibault <samuel.thibault@ens-lyon.org> Date: Sat Jul 18 15:08:03 2020 +0200 hurd: Fix longjmp early in initialization When e.g. an LD_PRELOAD fails, _dl_signal_exception/error longjmps, but TLS is not initialized yet, let along signal state. We thus mustn't look at them within __longjmp. * sysdeps/mach/hurd/i386/____longjmp_chk.S,__longjmp.S: Check for initialized value of %gs, and that sigstate is non-NULL. diff --git a/sysdeps/mach/hurd/i386/____longjmp_chk.S b/sysdeps/mach/hurd/i386/____longjmp_chk.S index 4d3a331728..5131386c60 100644 --- a/sysdeps/mach/hurd/i386/____longjmp_chk.S +++ b/sysdeps/mach/hurd/i386/____longjmp_chk.S @@ -60,7 +60,14 @@ ENTRY (____longjmp_chk) PTR_DEMANGLE (%ecx) #endif - movl %gs:SIGSTATE_OFFSET,%edi + movw %ds, %si + movw %gs, %di + cmpw %si, %di + jz .Lok /* TLS not initialized yet */ + + movl %gs:SIGSTATE_OFFSET, %edi + testl %edi, %edi + jnz .Lok /* sigstate not initialized yet */ testl $SS_ONSTACK, (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%edi) jnz .Lonstack diff --git a/sysdeps/mach/hurd/i386/__longjmp.S b/sysdeps/mach/hurd/i386/__longjmp.S index d123c214c9..73bbff9826 100644 --- a/sysdeps/mach/hurd/i386/__longjmp.S +++ b/sysdeps/mach/hurd/i386/__longjmp.S @@ -38,7 +38,14 @@ ENTRY (__longjmp) PTR_DEMANGLE (%ecx) #endif - movl %gs:SIGSTATE_OFFSET,%edi + movw %ds, %si + movw %gs, %di + cmpw %si, %di + jz .Lok /* TLS not initialized yet */ + + movl %gs:SIGSTATE_OFFSET, %edi + testl %edi, %edi + jnz .Lok /* sigstate not initialized yet */ testl $SS_ONSTACK, (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%edi) jz .Lok commit 5baad9a6f948b7822db3392097e7d79e9e018655 Author: Samuel Thibault <samuel.thibault@ens-lyon.org> Date: Sat Jul 18 15:12:56 2020 +0200 hurd: Fix longjmp check for sigstate * sysdeps/mach/hurd/i386/____longjmp_chk.S,__longjmp.S: Properly check for sigstate being NULL. diff --git a/sysdeps/mach/hurd/i386/____longjmp_chk.S b/sysdeps/mach/hurd/i386/____longjmp_chk.S index 5131386c60..a746a4f2ba 100644 --- a/sysdeps/mach/hurd/i386/____longjmp_chk.S +++ b/sysdeps/mach/hurd/i386/____longjmp_chk.S @@ -67,7 +67,7 @@ ENTRY (____longjmp_chk) movl %gs:SIGSTATE_OFFSET, %edi testl %edi, %edi - jnz .Lok /* sigstate not initialized yet */ + jz .Lok /* sigstate not initialized yet */ testl $SS_ONSTACK, (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%edi) jnz .Lonstack diff --git a/sysdeps/mach/hurd/i386/__longjmp.S b/sysdeps/mach/hurd/i386/__longjmp.S index 73bbff9826..af788ede0f 100644 --- a/sysdeps/mach/hurd/i386/__longjmp.S +++ b/sysdeps/mach/hurd/i386/__longjmp.S @@ -45,7 +45,7 @@ ENTRY (__longjmp) movl %gs:SIGSTATE_OFFSET, %edi testl %edi, %edi - jnz .Lok /* sigstate not initialized yet */ + jz .Lok /* sigstate not initialized yet */ testl $SS_ONSTACK, (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%edi) jz .Lok
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