linux-toradex.git/arch/arm/kernel/elf.c, branch v3.0.7 Linux kernel for Apalis and Colibri modules ARM: 6878/1: fix personality flag propagation across an exec 2011-04-14T08:15:24+00:00 Nicolas Pitre nicolas.pitre@linaro.org 2011-04-13T03:59:36+00:00 5e143436d04465c937c1a242808a99c46393af3e Our SET_PERSONALITY() implementation was overwriting all existing personality flags, including ADDR_NO_RANDOMIZE, making them unavailable to processes being exec'd after a call to personality() in user space. This prevents the gdb test suite from running successfully. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
Our SET_PERSONALITY() implementation was overwriting all existing
personality flags, including ADDR_NO_RANDOMIZE, making them unavailable
to processes being exec'd after a call to personality() in user space.
This prevents the gdb test suite from running successfully.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: 5883/1: Revert "disable NX support for OABI-supporting kernels" 2010-01-18T14:12:11+00:00 Rabin Vincent rabin@rab.in 2010-01-18T14:04:32+00:00 a7b22962776109b5bfe3a3efa4f42622318c547d This reverts commit 14f0aa359365e8a93a77b71e3b840274b9b4dcb1. That commit was needed earlier because system call restarting for OABI (compat) required an executable stack and thus had problems with NX. Since ab72b00734ae4d0b ("ARM: Fix signal restart issues with NX and OABI compat") has reworked the code to not require an executable stack anymore, we can re-enable NX support for kernels with OABI (compat) support. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
This reverts commit 14f0aa359365e8a93a77b71e3b840274b9b4dcb1.

That commit was needed earlier because system call restarting for
OABI (compat) required an executable stack and thus had problems
with NX.  Since ab72b00734ae4d0b ("ARM: Fix signal restart issues
with NX and OABI compat") has reworked the code to not require an
executable stack anymore, we can re-enable NX support for kernels
with OABI (compat) support.

Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[ARM] disable NX support for OABI-supporting kernels 2009-05-23T10:36:20+00:00 Russell King rmk@dyn-67.arm.linux.org.uk 2009-05-23T10:36:20+00:00 14f0aa359365e8a93a77b71e3b840274b9b4dcb1 Our signal syscall restart handling for these kernels still uses the userspace stack to build code for restarting the syscall. Unfortunately, fixing this is non-trivial, and so for the time being, we resolve the problem by disabling NX support. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
Our signal syscall restart handling for these kernels still uses
the userspace stack to build code for restarting the syscall.
Unfortunately, fixing this is non-trivial, and so for the time
being, we resolve the problem by disabling NX support.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[ARM] 5404/1: Fix condition in arm_elf_read_implies_exec() to set READ_IMPLIES_EXEC 2009-02-19T14:45:27+00:00 Makito SHIOKAWA lkhmkt@gmail.com 2009-02-19T14:34:59+00:00 9da616fb9946c8d65387052e5a538b8f54ddb292 READ_IMPLIES_EXEC must be set when: o binary _is_ an executable stack (i.e. not EXSTACK_DISABLE_X) o processor architecture is _under_ ARMv6 (XN bit is supported from ARMv6) Signed-off-by: Makito SHIOKAWA <lkhmkt@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
READ_IMPLIES_EXEC must be set when:
o binary _is_ an executable stack (i.e. not EXSTACK_DISABLE_X)
o processor architecture is _under_ ARMv6 (XN bit is supported from ARMv6)

Signed-off-by: Makito SHIOKAWA <lkhmkt@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[ARM] fix VFP+softfloat binaries 2008-11-04T15:02:09+00:00 Russell King rmk@dyn-67.arm.linux.org.uk 2008-11-02T09:16:50+00:00 d2ed5cb80a241518dd71f467c884bfabbe15f68c 2.6.28-rc tightened up the ELF architecture checks on ARM. For non-EABI it only allows VFP if the hardware supports it. However, the kernel fails to also inspect the soft-float flag, so it incorrectly rejects binaries using soft-VFP. The fix is simple: also check that EF_ARM_SOFT_FLOAT isn't set before rejecting VFP binaries on non-VFP hardware. Acked-by: Mikael Pettersson <mikpe@it.uu.se> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
2.6.28-rc tightened up the ELF architecture checks on ARM.  For
non-EABI it only allows VFP if the hardware supports it.  However,
the kernel fails to also inspect the soft-float flag, so it
incorrectly rejects binaries using soft-VFP.

The fix is simple: also check that EF_ARM_SOFT_FLOAT isn't set
before rejecting VFP binaries on non-VFP hardware.

Acked-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[ARM] Improve non-executable support 2008-10-01T15:41:10+00:00 Russell King rmk@dyn-67.arm.linux.org.uk 2008-09-07T16:16:54+00:00 8ec53663d2698076468b3e1edc4e1b418bd54de3 Add support for detecting non-executable stack binaries, and adjust permissions to prevent execution from data and stack areas. Also, ensure that READ_IMPLIES_EXEC is enabled for older CPUs where that is true, and for any executable-stack binary. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
Add support for detecting non-executable stack binaries, and adjust
permissions to prevent execution from data and stack areas.  Also,
ensure that READ_IMPLIES_EXEC is enabled for older CPUs where that
is true, and for any executable-stack binary.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>