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author | Rich Felker <dalias@aerifal.cx> | 2011-04-17 15:30:08 -0400 |
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committer | Rich Felker <dalias@aerifal.cx> | 2011-04-17 15:30:08 -0400 |
commit | 09dae2b7b66f741b30aa7ce95ab395239da20762 (patch) | |
tree | da94ed95c914ec60663aec3368e3642d8c41cfeb /src/stdio/__stdout_write.c | |
parent | ebf82447be4b30bedc19ad868c3a0662b1ba596d (diff) | |
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fix bugs in cancellable syscall asm
x86_64 was just plain wrong in the cancel-flag-already-set path, and
crashing.
the more subtle error was not clearing the saved stack pointer before
returning to c code. this could result in the signal handler
misidentifying c code as the pre-syscall part of the asm, and acting
on cancellation at the wrong time, and thus resource leak race
conditions.
also, now __cancel (in the c code) is responsible for clearing the
saved sp in the already-cancelled branch. this means we have to use
call rather than jmp to ensure the stack pointer in the c will never
match what the asm saved.
Diffstat (limited to 'src/stdio/__stdout_write.c')
0 files changed, 0 insertions, 0 deletions