* Florian Weimer <fweimer@xxxxxxxxxx> wrote: > This patch is based on the previous discussion (pkeys: Support setting > access rights for signal handlers): > > https://marc.info/?t=151285426000001 > > It aligns the signal semantics of the x86 implementation with the upcoming > POWER implementation, and defines a new flag, so that applications can > detect which semantics the kernel uses. > > A change in this area is needed to make memory protection keys usable for > protecting the GOT in the dynamic linker. > > (Feel free to replace the trigraphs in the commit message before committing, > or to remove the program altogether.) Could you please send patches not as MIME attachments? Also, the protection keys testcase first need to be fixed, before we complicate them - for example on a pretty regular Ubuntu x86-64 installation they fail to build with the build errors attached further below. On an older Fedora 23 installation, the testcases themselves don't build at all: fomalhaut:~/tip2/tools/testing/selftests/x86> make protection_keys gcc -O2 -g -std=gnu99 -pthread -Wall -no-pie protection_keys.c -o protection_keys gcc: error: unrecognized command line option ‘-no-pie’ <builtin>: recipe for target 'protection_keys' failed make: *** [protection_keys] Error 1 so it's one big mess at the moment that needs some love ... Thanks, Ingo ==================> triton:~/tip/tools/testing/selftests/x86> make gcc -m32 -o /home/mingo/tip/tools/testing/selftests/x86/protection_keys_32 -O2 -g -std=gnu99 -pthread -Wall -no-pie protection_keys.c -lrt -ldl -lm In file included from /usr/include/signal.h:57:0, from protection_keys.c:33: protection_keys.c: In function ‘signal_handler’: protection_keys.c:253:6: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token u64 si_pkey; ^ protection_keys.c:253:6: error: expected expression before ‘.’ token protection_keys.c:295:2: error: ‘_sifields’ undeclared (first use in this function) si_pkey = *si_pkey_ptr; ^ protection_keys.c:295:2: note: each undeclared identifier is reported only once for each function it appears in In file included from protection_keys.c:46:0: pkey-helpers.h: In function ‘sigsafe_printf’: pkey-helpers.h:42:3: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result] write(1, dprint_in_signal_buffer, len); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ protection_keys.c: In function ‘dumpit’: protection_keys.c:419:3: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result] write(1, buf, nr_read); ^~~~~~~~~~~~~~~~~~~~~~ Makefile:47: recipe for target '/home/mingo/tip/tools/testing/selftests/x86/protection_keys_32' failed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
