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67 lines
2.0 KiB
Diff
67 lines
2.0 KiB
Diff
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With latest versions of glibc, a lot of apps failed on a PaX enabled
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system with:
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cannot enable executable stack as shared object requires: Permission denied
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This is due to PaX 'exec-protecting' the stack, and ld.so then trying
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to make the stack executable due to some libraries not containing the
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PT_GNU_STACK section. Bug #32960. <azarah@gentoo.org> (12 Nov 2003).
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Patch also NPTL. Bug #116086. <kevquinn@gentoo.org> (20 Dec 2005).
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diff -durN glibc-2.12.1.orig/nptl/allocatestack.c glibc-2.12.1/nptl/allocatestack.c
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--- glibc-2.12.1.orig/nptl/allocatestack.c 2009-01-29 21:34:16.000000000 +0100
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+++ glibc-2.12.1/nptl/allocatestack.c 2009-11-13 00:50:33.000000000 +0100
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@@ -329,7 +329,8 @@
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# error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
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#endif
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if (mprotect (stack, len, PROT_READ | PROT_WRITE | PROT_EXEC) != 0)
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- return errno;
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+ if (errno != EACCES) /* PAX is enabled */
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+ return errno;
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return 0;
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}
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diff -durN glibc-2.12.1.orig/sysdeps/unix/sysv/linux/dl-execstack.c glibc-2.12.1/sysdeps/unix/sysv/linux/dl-execstack.c
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--- glibc-2.12.1.orig/sysdeps/unix/sysv/linux/dl-execstack.c 2006-01-08 09:21:15.000000000 +0100
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+++ glibc-2.12.1/sysdeps/unix/sysv/linux/dl-execstack.c 2009-11-13 00:50:33.000000000 +0100
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@@ -63,7 +63,10 @@
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else
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# endif
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{
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- result = errno;
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+ if (errno == EACCES) /* PAX is enabled */
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+ result = 0;
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+ else
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+ result = errno;
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goto out;
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}
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}
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@@ -89,7 +92,12 @@
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page -= size;
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else
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{
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- if (errno != ENOMEM) /* Unexpected failure mode. */
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+ if (errno == EACCES) /* PAX is enabled */
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+ {
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+ result = 0;
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+ goto out;
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+ }
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+ else if (errno != ENOMEM) /* Unexpected failure mode. */
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{
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result = errno;
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goto out;
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@@ -115,7 +123,12 @@
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page += size;
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else
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{
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- if (errno != ENOMEM) /* Unexpected failure mode. */
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+ if (errno == EACCES) /* PAX is enabled */
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+ {
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+ result = 0;
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+ goto out;
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+ }
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+ else if (errno != ENOMEM) /* Unexpected failure mode. */
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{
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result = errno;
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goto out;
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