mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-15 07:48:30 +00:00
35 lines
966 B
Diff
35 lines
966 B
Diff
This patch makes /proc/self/exe executable even if proc
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is not mounted. It is especially useful on NOMMU arches.
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diff -urp ../linux-2.6.30.org/fs/exec.c linux-2.6.30/fs/exec.c
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--- ../linux-2.6.30.org/fs/exec.c 2009-06-10 05:05:27.000000000 +0200
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+++ linux-2.6.30/fs/exec.c 2009-06-25 00:20:13.000000000 +0200
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@@ -652,9 +652,25 @@ struct file *open_exec(const char *name)
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file = do_filp_open(AT_FDCWD, name,
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O_LARGEFILE | O_RDONLY | FMODE_EXEC, 0,
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MAY_EXEC | MAY_OPEN);
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- if (IS_ERR(file))
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- goto out;
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+ if (IS_ERR(file)) {
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+ if ((PTR_ERR(file) == -ENOENT || PTR_ERR(file) == -EACCES)
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+ && strcmp(name, "/proc/self/exe") == 0
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+ ) {
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+ struct file *sv = file;
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+ struct mm_struct *mm;
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+ mm = get_task_mm(current);
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+ if (!mm)
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+ goto out;
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+ file = get_mm_exe_file(mm);
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+ mmput(mm);
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+ if (file)
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+ goto ok;
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+ file = sv;
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+ }
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+ goto out;
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+ }
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+ok:
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err = -EACCES;
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if (!S_ISREG(file->f_path.dentry->d_inode->i_mode))
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goto exit;
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