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Kernel+LibC+LibELF: Set stack size based on PT_GNU_STACK during execve
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.
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9 changed files with 43 additions and 7 deletions
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@ -487,7 +487,7 @@ typedef struct {
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#define PT_GNU_EH_FRAME 0x6474e550 /* Exception handling info */
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#define PT_GNU_RELRO 0x6474e552 /* Read-only after relocation */
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#define PT_GNU_STACK 0x6474e551 /* Stack permissions info */
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#define PT_GNU_STACK 0x6474e551 /* Stack permissions & size info */
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#define PT_OPENBSD_RANDOMIZE 0x65a3dbe6 /* fill with random data */
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#define PT_OPENBSD_WXNEEDED 0x65a3dbe7 /* program performs W^X violations */
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