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| author | Sergey Bugaev <bugaevc@gmail.com> | 2024-03-23 20:32:47 +0300 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2024-03-23 22:48:44 +0100 |
| commit | a4273efa219480a7f2c9c8fa7bc8bb71c48c3604 (patch) | |
| tree | 0c9a036ad60a28f33a1ee83b8b2d47998eb2f725 | |
| parent | b467cfcaee34452df845c678dd2ba36ea2221855 (diff) | |
| download | glibc-a4273efa219480a7f2c9c8fa7bc8bb71c48c3604.zip glibc-a4273efa219480a7f2c9c8fa7bc8bb71c48c3604.tar.gz glibc-a4273efa219480a7f2c9c8fa7bc8bb71c48c3604.tar.bz2 | |
htl: Respect GL(dl_stack_flags) when allocating stacks
Previously, HTL would always allocate non-executable stacks. This has
never been noticed, since GNU Mach on x86 ignores VM_PROT_EXECUTE and
makes all pages implicitly executable. Since GNU Mach on AArch64
supports non-executable pages, HTL forgetting to pass VM_PROT_EXECUTE
immediately breaks any code that (unfortunately, still) relies on
executable stacks.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-ID: <20240323173301.151066-7-bugaevc@gmail.com>
| -rw-r--r-- | sysdeps/htl/Versions | 4 | ||||
| -rw-r--r-- | sysdeps/mach/htl/pt-stack-alloc.c | 9 |
2 files changed, 11 insertions, 2 deletions
diff --git a/sysdeps/htl/Versions b/sysdeps/htl/Versions index 3a3b1e8..7b5450d 100644 --- a/sysdeps/htl/Versions +++ b/sysdeps/htl/Versions @@ -12,4 +12,8 @@ libc { pthread_spin_destroy; pthread_spin_init; pthread_spin_lock; pthread_spin_trylock; pthread_spin_unlock; } + + GLIBC_PRIVATE { + __vm_map; + } } diff --git a/sysdeps/mach/htl/pt-stack-alloc.c b/sysdeps/mach/htl/pt-stack-alloc.c index 61974bd..0597770 100644 --- a/sysdeps/mach/htl/pt-stack-alloc.c +++ b/sysdeps/mach/htl/pt-stack-alloc.c @@ -31,9 +31,14 @@ int __pthread_stack_alloc (void **stackaddr, size_t stacksize) { error_t err; + vm_prot_t prot = VM_PROT_READ | VM_PROT_WRITE; - err = __vm_allocate (__mach_task_self (), (vm_offset_t *) stackaddr, - stacksize, TRUE); + if (GL(dl_stack_flags) & PF_X) + prot |= VM_PROT_EXECUTE; + + err = __vm_map (__mach_task_self (), (vm_offset_t *) stackaddr, + stacksize, 0, TRUE, MEMORY_OBJECT_NULL, 0, FALSE, + prot, VM_PROT_ALL, VM_INHERIT_COPY); if (err == KERN_NO_SPACE) err = EAGAIN; |