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consolidate BINPRM_FLAGS_ENFORCE_NONDUMP handling

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new helper: would_dump(bprm, file).  Checks if we are allowed to
read the file and if we are not - sets ENFORCE_NODUMP.  Exported,
used in places that previously open-coded the same logics.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-06-19 12:49:47 -04:00
parent 78f32a9b47
commit 1b5d783c94
5 changed files with 15 additions and 9 deletions
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3
fs/binfmt_misc.c
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@ -149,8 +149,7 @@ static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs)
/* if the binary is not readable than enforce mm->dumpable=0
regardless of the interpreter's permissions */
if (file_permission(bprm->file, MAY_READ))
bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
would_dump(bprm, bprm->file);
allow_write_access(bprm->file);
bprm->file = NULL;