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With latest versions of glibc, a lot of apps failed on a PaX enabled
system with:
cannot enable executable stack as shared object requires: Permission denied
This is due to PaX 'exec-protecting' the stack, and ld.so then trying
to make the stack executable due to some libraries not containing the
PT_GNU_STACK section. Bug #32960. <azarah@gentoo.org> (12 Nov 2003).
Patch also NPTL. Bug #116086. <kevquinn@gentoo.org> (20 Dec 2005).
---
nptl/allocatestack.c | 3 ++-
sysdeps/unix/sysv/linux/dl-execstack.c | 19 ++++++++++++++++---
2 files changed, 18 insertions(+), 4 deletions(-)
--- a/nptl/allocatestack.c
+++ b/nptl/allocatestack.c
@@ -334,7 +334,8 @@
# error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
#endif
if (mprotect (stack, len, PROT_READ | PROT_WRITE | PROT_EXEC) != 0)
- return errno;
+ if (errno != EACCES) /* PAX is enabled */
+ return errno;
return 0;
}
--- a/sysdeps/unix/sysv/linux/dl-execstack.c
+++ b/sysdeps/unix/sysv/linux/dl-execstack.c
@@ -62,7 +62,10 @@
else
# endif
{
- result = errno;
+ if (errno == EACCES) /* PAX is enabled */
+ result = 0;
+ else
+ result = errno;
goto out;
}
}
@@ -88,7 +91,12 @@
page -= size;
else
{
- if (errno != ENOMEM) /* Unexpected failure mode. */
+ if (errno == EACCES) /* PAX is enabled */
+ {
+ result = 0;
+ goto out;
+ }
+ else if (errno != ENOMEM) /* Unexpected failure mode. */
{
result = errno;
goto out;
@@ -114,7 +122,12 @@
page += size;
else
{
- if (errno != ENOMEM) /* Unexpected failure mode. */
+ if (errno == EACCES) /* PAX is enabled */
+ {
+ result = 0;
+ goto out;
+ }
+ else if (errno != ENOMEM) /* Unexpected failure mode. */
{
result = errno;
goto out;
|
