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| author | Vineet Gupta <vgupta@synopsys.com> | 2018-07-11 20:42:20 +0300 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2018-07-11 21:03:06 +0300 |
| commit | 93312b6da4df31e4102ce5420e6217135a16c7ea (patch) | |
| tree | 2391f9237e432b332f31fb29264619026a77ba14 /arch/arc | |
| parent | 6e3761145a9ba3ce267c330b6bff51cf6a057b06 (diff) | |
| download | linux-93312b6da4df31e4102ce5420e6217135a16c7ea.tar.xz | |
ARC: mm: allow mprotect to make stack mappings executable
mprotect(EXEC) was failing for stack mappings as default vm flags was
missing MAYEXEC.
This was triggered by glibc test suite nptl/tst-execstack testcase
What is surprising is that despite running LTP for years on, we didn't
catch this issue as it lacks a directed test case.
gcc dejagnu tests with nested functions also requiring exec stack work
fine though because they rely on the GNU_STACK segment spit out by
compiler and handled in kernel elf loader.
This glibc case is different as the stack is non exec to begin with and
a dlopen of shared lib with GNU_STACK segment triggers the exec stack
proceedings using a mprotect(PROT_EXEC) which was broken.
CC: stable@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/include/asm/page.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arc/include/asm/page.h b/arch/arc/include/asm/page.h index 109baa06831c..09ddddf71cc5 100644 --- a/arch/arc/include/asm/page.h +++ b/arch/arc/include/asm/page.h @@ -105,7 +105,7 @@ typedef pte_t * pgtable_t; #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr)) /* Default Permissions for stack/heaps pages (Non Executable) */ -#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE) +#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) #define WANT_PAGE_VIRTUAL 1 |