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glibc - fix spawni #360

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glibc - fix spawni #360

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12 changes: 6 additions & 6 deletions src/glibc/sysdeps/unix/sysv/linux/spawni.c
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Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,7 @@
#include <paths.h>
#include <shlib-compat.h>
#include <spawn.h>
#include <spawn_int.h>
#include <posix/spawn_int.h>
#include <sysdep.h>
#include <sys/resource.h>
#include <clone_internal.h>
Expand Down Expand Up @@ -348,8 +348,8 @@ __spawnix (int *pid, const char *file,
return errno;
}

int prot = (PROT_READ | PROT_WRITE
| ((GL (dl_stack_flags) & PF_X) ? PROT_EXEC : 0));
// lind-wasm: disallow PROC_EXEC
int prot = (PROT_READ | PROT_WRITE);
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@rennergade rennergade Oct 14, 2025

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this probably should fall through to rawposix where we can lind_panic_debug

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@rennergade rennergade Oct 20, 2025

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explain why if we wont remove

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@rennergade rennergade Oct 20, 2025

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typo


/* Add a slack area for child's stack. */
size_t argv_size = (argc * sizeof (void *)) + 512;
Expand All @@ -361,8 +361,9 @@ __spawnix (int *pid, const char *file,
where it might use about 1k extra stack space). */
argv_size += (32 * 1024);
size_t stack_size = ALIGN_UP (argv_size, GLRO(dl_pagesize));
// lind-wasm: remove MAP_STACK
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@rennergade rennergade Oct 20, 2025

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why?

void *stack = __mmap (NULL, stack_size, prot,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (__glibc_unlikely (stack == MAP_FAILED))
return errno;

Expand Down Expand Up @@ -401,8 +402,7 @@ __spawnix (int *pid, const char *file,
.flags = (set_cgroup ? CLONE_INTO_CGROUP : 0)
| (use_pidfd ? CLONE_PIDFD : 0)
| CLONE_CLEAR_SIGHAND
| CLONE_VM
| CLONE_VFORK,
| CLONE_VFORK, // lind-wasm: removed CLONE_VM flag
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@rennergade rennergade Oct 20, 2025

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why?

.exit_signal = SIGCHLD,
.stack = (uintptr_t) stack,
.stack_size = stack_size,
Expand Down