Messages in this thread | | | Date | Mon, 25 Sep 2006 08:35:07 +0400 | From | Stas Sergeev <> | Subject | Re: [patch] remove MNT_NOEXEC check for PROT_EXEC mmaps |
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Hi.
Valdis.Kletnieks@vt.edu wrote: >> But why exactly? They do: >> shm_open(); >> mmap(PROT_READ|PROT_WRITE|PROT_EXEC); >> and mmap fails. >> Where is the fault of an app here? > Are you suggesting that it's not an app's fault/problem if it tries to > open a writable file on a R/O filesystem? Because it's essentially the > same problem.... It is not really the same - the app is not trying to create an "executable" file on a noexec filesystem. PROT_EXEC never required the exec permission on a file btw. The MAP_PRIVATE mmap roughly means a read of the file into the memory, where the program can do anything with its data, including an execution. Does the R/O filesystem disallow PROT_WRITE for MAP_PRIVATE? Haven't tried, but I hope it doesn't.
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