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Kernel+LibC+LibELF: Set stack size based on PT_GNU_STACK during execve

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Some programs explicitly ask for a different initial stack size than
what the OS provides. This is implemented in ELF by having a
PT_GNU_STACK header which has its p_memsz set to the amount that the
program requires. This commit implements this policy by reading the
p_memsz of the header and setting the main thread stack size to that.
ELF::Image::validate_program_headers ensures that the size attribute is
a reasonable value.
This commit is contained in:
sin-ack 2022-10-01 19:29:59 +00:00 • committed by Andrew Kaster
parent 3275015786
commit ef6921d7c7
9 changed files with 43 additions and 7 deletions
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2
Kernel/API/Syscall.h
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@ -360,7 +360,7 @@ struct SC_create_thread_params {
// ... ok, if you say so posix. Guess we get to lie to people about guard page size
unsigned int guard_page_size = 0; // Rounded up to PAGE_SIZE
unsigned int reported_guard_page_size = 0; // The lie we tell callers
unsigned int stack_size = 1 * MiB; // Default PTHREAD_STACK_MIN
unsigned int stack_size = 1 * MiB; // Equal to Thread::default_userspace_stack_size
void* stack_location; // nullptr means any, o.w. process virtual address
# if ARCH(X86_64)
FlatPtr rdi;